What are the precautions for titanium pipe welding

In terms of high-quality welds, titanium pipes must meet the following conditions:

1. Welders with qualification for welding titanium pipes.

2. High purity gas protection.

3. High-purity titanium alloy welding wire.

4. Double-sided protection is required for the requirements of the filming site to prevent root oxidation.
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Difficulties in machining thin-walled titanium alloy workpieces

 In the machinery manufacturing industry, titanium alloy materials have characteristics that other metal materials cannot have: high specific strength, high thermal strength, and good corrosion resistance; the alloy density is only 58% of steel, so the thinner made of titanium alloy materials The wall shell structure will become a common workpiece for defense products. Due to the thin wall of the workpiece, it is easy to deform during processing. The radial clamping force causes elastic deformation of the workpiece. The rapid tool wear makes the processing size unstable, and it is difficult to ensure the processing quality. The workpiece rejection rate and processing cost remain high. Technicians and processing operators.

The traditional titanium alloy thin-wall workpiece processing does not pay attention to the selection of tool materials and cutting elements, which makes the processing tools wear fast and increase the deformation; only a single turning process is used instead of a gradual cycle of stress relief technology

There are many factors that affect processing deformation, mainly reflecting the following aspects.

(1) The deformation of the workpiece caused by the thin cutting heat

The thermal conductivity of titanium alloy materials is lower than that of stainless steel and high-temperature alloys. The difference in heat dissipation conditions is 1/4 and 1/16 of that of iron and aluminum, which makes the temperature of the cutting zone rise rapidly, and it is not easy to dissipate near the cutting edge, resulting in processing The stress concentration near the tool tip causes the tool to wear and chip, and cause the workpiece to deform.

(2) The rigidity of the workpiece is poor. During the cutting process, the machine tool vibration and cutting elements are not suitable to produce deformation. The thin-walled workpiece has poor rigidity and is caused by machine tool vibration and other factors. , Cause deformation.

(3) Radial clamping force deforms during workpiece cutting

When the titanium alloy thin-walled workpiece is processed and clamped, under the action of the radial clamping force, it is easy to cause elastic deformation, which affects the dimensional accuracy and shape tolerance requirements of the workpiece.

(4) Deformation caused by stress release during workpiece cutting

During the processing of thin-walled titanium alloy workpieces, each time the metal is cut, the stress will be released, causing the workpiece to deform.
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How to extend the service life of titanium plates

The service life of the titanium plate is very important. With the extension of use time, the gasket of the titanium plate must be replaced. The replacement time of the imported equipment gasket is 2 years, and the replacement time is about 5 years. If it is used for too long, cracks will occur.

With the gradual development of my country's food, medicine, chemical, refrigeration and other industries, the application fields of titanium plates are also very extensive. Facing the huge market prospects, my country's titanium plate manufacturers continue to break through new technologies to create a series of advantages such as energy-saving heat exchange, high heat exchange efficiency, high-pressure resistance, and easy cleaning. Of course, the service life will be longer than before.

So how to improve the service life of the titanium plate? Technicians say that the life of the titanium plate is related to many factors. Next, we will enter the topic to discuss the life of the titanium plate and the factors related to it.

1. When using titanium plates, pay attention to pressure fluctuations and control the temperature to ensure the stability of the pressure. Overpressure operation is not allowed, which will affect the life of the titanium plate.

2. When the device is turned on, the device starts to run. If the pressures of the two media are different, open the low-pressure side valve first, and then open the high-pressure side valve. Prevent excessive pressure difference and prevent plate deformation and leakage.

3. The cleaning of the titanium plate is very important, because the long-term operation of the equipment will cause scaling, corrosion, and coking of the medium, and scaling will occur inside and outside the water pipe, which requires thorough cleaning. Common cleaning methods include water washing, steam blowing, mechanical cleaning and chemical cleaning.

4. When using the titanium plate, it must be operated strictly in accordance with the specifications, because there will be a pressure range and working temperature on the nameplate of the heat exchange unit. If the pressure or temperature is too high, it will cause the gasket to leak. Therefore, it is strictly forbidden to produce severe shocks during operation.

5. When the equipment is stopped, first slowly cut off the high-pressure side, and then slowly cut off the low-pressure fluid. why? Because it can reduce the pressure difference of the titanium plate, protect the titanium plate, and extend the life of the titanium plate.
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How is titanium alloy processed?

Since the discovery of titanium in 1790, mankind has carried out a century of painstaking exploration in order to obtain the special properties of titanium. In 1910, titanium was first manufactured by humans, but the application of titanium alloy processing was difficult and long. It was not until 1951, 40 years later, that industrial production was finally realized.

The development and application of titanium alloys in my country began in the 1960s.

Titanium alloy has the characteristics of high specific strength, corrosion resistance, high-temperature resistance and fatigue resistance. Titanium alloy of the same size only accounts for 60% of steel, but its strength is higher than that of alloy steel. Titanium alloys are widely used in medical fields because of their good properties, such as artificial joints, bone fixation devices, dentures, etc.

Titanium alloys are widely used in aircraft structural parts and heat-resistant parts. It is one of the main structural materials for modern aircraft and engines, and is called "space metal".

But titanium alloy is like a strong horse. It must be tamed to reach the goal of thousands of miles a day. So how can we "tame" titanium alloy?

Titanium alloy has poor thermal conductivity, high hardness and easy rebound. The difference in thermal conductivity is reflected in the heat generated by friction during processing. If it is other metals, it will quickly spread to the whole, such as the pot we usually use.

However, due to the poor thermal conductivity of titanium alloys, heat will continue to accumulate, making the titanium alloy sticky, making the tool brittle, severely worn and even damaged, just like cutting chewing gum with a knife.

Titanium alloys have high hardness, and aluminum alloy materials for airplanes are easy to process: one meter of titanium alloy materials can process 25 meters of aluminum alloy materials, which is economical, but the strength of aluminum alloys is difficult to meet the requirements. Therefore, although the processing of titanium alloys is more difficult , But it is still necessary. In addition, titanium alloy springback seriously affects the machining accuracy of parts, especially thin-walled complex parts.

Powerful milling, shallow cutting high-speed milling, etc. make titanium alloy parts processing faster and more stable. In order to tame these horses, we developed the superplastic forming method of titanium alloy sheet processing, the compressed air stirring of chemical milling treatment and the rapid welding method of small current.

Titanium alloy can be used in aviation equipment manufacturing. I believe that with the continuous research and exploration of the majority of scientific and technological workers in the aviation industry, our understanding of titanium alloys will gradually deepen. For the domestication of titanium alloys, we will have more means to make greater contributions to my country's aviation industry!
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What is the reaction of titanium alloy materials in the air?

The reaction of titanium alloy materials in the air, such as titanium rods, titanium tubes, etc., is usually related to the three non-metallic elements of oxygen, nitrogen and hydrogen. Their reaction process is closely related to temperature.

Titanium reacts very slowly with oxygen in the air below 100 degrees, and only the surface is oxidized at 500 degrees. As the temperature increases, the surface oxide film begins to dissolve in the titanium, and oxygen begins to diffuse into the metal. However, at 700°C, oxygen does not enter the inner lattice of the metal. When the temperature exceeds 700°C, the diffusion of oxygen to the metal is accelerated, and the surface oxide film loses its protective effect at high temperatures.

The reaction of titanium with oxygen depends on the shape and temperature of titanium. Powder titanium will burn or explode violently under the action of static electricity, sparks and friction in the air at room temperature. However, dense titanium is stable in air at room temperature. When the dense titanium is heated in air, it starts to react with oxygen. First, oxygen enters the crystal lattice on the titanium surface to form a dense oxide film. The oxide film on the surface can prevent oxygen from diffusing into the interior and has a protective effect. Therefore, titanium is stable in the air below 500°C. The color of the surface oxide film is related to the formation temperature. Below 200 degrees is silvery-white, 300 degrees is light yellow, 400 degrees is golden yellow, 500 degrees is blue, 600 degrees is purple, 700-800 degrees is red-gray, and 800-900 degrees is gray. In pure oxygen, the initial temperature ratio of titanium to oxygen is lower than the initial temperature ratio in air. At about 500-600°C, titanium burns in oxygen.

Titanium does not react with nitrogen at room temperature, but at high temperatures, titanium is one of the few metal elements that can burn in nitrogen. When the combustion temperature of titanium in nitrogen is higher than 800°C, the reaction between titanium and nitrogen is very violent. The reaction of titanium and nitrogen can not only generate titanium nitride (ti3n, Ti N, etc.), but also form a Ti-N solid solution. When the temperature is 500-550℃, titanium starts to absorb nitrogen and form an interstitial solid solution; when the temperature exceeds 600℃, the nitrogen absorption rate of titanium increases. In the Ti-N solid solution, nitrogen enters the titanium lattice in the form of titanium nitride, the phase transition temperature of titanium increases, and nitrogen is also a stabilizer of titanium. The maximum solubility (mass fraction) of nitrogen in the air is 7% at 1050°C and 2% at 2020°C. However, the absorption rate of nitrogen by titanium is much slower than the absorption rate of oxygen. Therefore, titanium mainly absorbs oxygen in the air, while the absorption of nitrogen is secondary.
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How to do the preservation of titanium alloy screws

Although titanium alloy screws are small, they are used in many places. However, how should we keep them when we don't need them? It is necessary to know that titanium alloy screws are prone to rust if they have been exposed to the air, so it is necessary to do a good job of moisture-proofing titanium alloy screws:

1. The choice of component insulation dipping varnish, such as epoxy resin or polyurethane dipping varnish. Choose paint that does not contain volatile acids. Vibrating machinery uses solvent-free paint.

2. When using titanium alloy screw melamine alkyd paint, the curing temperature and curing time should be adjusted. The curing temperature is slightly higher than 130 degrees Celsius and the curing time is greater than 180 minutes. It is appropriate to strictly implement the process, especially in the hot and humid seasons. Because of the concept of rust and rust, the conventional drying time of the sample paint factory is not necessarily abundant, and cars have a specific internal shape.

3. Surface corrosion treatment of titanium alloy screws refers to the use of various methods to maintain the metal surface. The role is to isolate the metal from the corrosive environment to inhibit the corrosion process, reduce the contact between corrosive media and the metal surface, and achieve the purpose of preventing or slowing down corrosion.

Pay special attention to the selection technology of screw material:

1. The mechanical properties and strength requirements of the screw material are strong. Some screws need relatively high strength, and then choose the higher the strength of the screw material itself.

2. The corrosion resistance of materials in working conditions is required. Some screws of the standard network are used for the above-mentioned products with strong corrosion. This requires us to choose the corrosion resistance of strong spiral steel wires.

3. The material's heat resistance and working temperature requirements. When some titanium alloy screws are used for high-temperature operation, it is necessary to select the high-temperature performance of the screw material.

4. Performance requirements in the production process of material processing. Some titanium alloy screws need to deal with the difficulty of thread and hardness in the production process, so it is necessary to choose the appropriate hardness of the screw material, which is conducive to processing and production.

5. The screw material is selected due to the weight, price, purchase and other factors of the screw itself. It is a better choice to consider the materials in these fields properly.

The above is some work on the moisture-proof of titanium alloy screws, starting from the details, save the titanium alloy screws and use them when needed.
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Use and formation classification of titanium alloy

The output power of titanium alloy die forgings is much higher than that of free forgings, but it requires equipment and forging dies, which is suitable for large quantities of medium and small forgings. According to the cross-sectional shape, the profiles can be divided into special sections such as round steel, square steel, hexagonal steel, flat steel, angle steel, channel steel, I-beam, etc. The profiles are hot-rolled and cold-drawn. Hot-rolled profiles have low precision and low prices. Suitable for general titanium alloy blanks. Cold-drawn profiles have the characteristics of small size, high precision, and easy to complete active feed, but they are expensive and are mainly used for mass production and suitable for active machine tool processing.

Driven by science and technology, new materials have emerged and the application fields have gradually expanded. The application of titanium in the C919 large aircraft project and the 4500-meter deep submersible manned spherical shell project has shown a good trend of vigorous development of the titanium industry. Looking back at the development of my country’s titanium industry in 2018, Wang Wensheng, chairman of the Titanium, Zirconium and Hafnium Branch of the Nonferrous Metals Industry Association, believes that although the demand for aviation and other industries continues to improve in 2018, titanium sponge continues to hit new highs with the rise in the price of titanium and raw materials. However, the pressure on environmental protection is increasing, the demand in traditional industrial fields such as chemical industry, metallurgy, and salt making is still shrinking, and the price of titanium materials is rising weakly.

Titanium materials: titanium plate, titanium rod, titanium tube, titanium wire, titanium copper composite rod, titanium steel composite plate. Titanium products: titanium screws, titanium machined parts, titanium flanges, titanium pipe fittings, titanium pipes, titanium target blocks, titanium special-shaped parts, etc. Titanium equipment category: titanium tube heat exchanger, titanium coil, titanium heating tube, titanium cooler, titanium condenser, titanium anode plate, titanium filter, titanium evaporator, titanium stirring shaft and other titanium non-standard equipment. Products are widely used in vacuum salt production, chemical, petrochemical, production, Chlor-alkali industry, electroplating, electrolysis, aviation, seawater desalination and other industries.
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Welding problems of dissimilar metals such as titanium alloy and steel

Titanium alloys are widely used in aerospace, medical equipment and other industries because of their high specific strength and thermal conductivity, good corrosion resistance and biocompatibility. Due to the particularity of dissimilar metal connection, common methods include diffusion welding, friction stir welding, fusion brazing, laser welding, cold pressure welding and other special connection techniques. Research on the welding of titanium alloys and dissimilar metals is an effective way to give full play to the excellent properties of titanium alloys and expand its application range.

Titanium alloy/steel dissimilar welding composite structure not only has a high specific strength and good corrosion resistance of titanium alloy but also is compatible with the advantages of wide application range and low price of steel materials. However, due to the large difference in thermal conductivity and linear expansion coefficient between titanium alloy and steel, and poor mutual solubility, brittle and hard Ti-Fe intermetallic compounds are easily formed during welding, making it difficult to weld dissimilar titanium alloy/steel. In order to solve these problems, the researchers conducted in-depth research and analysis on the diffusion welding, brazing, explosive welding and other welding technologies of titanium alloy/steel dissimilar metals.

Ti6Al2Zr2Mo2V titanium alloy and 304 austenitic stainless steel were electron beam welded, and the filler material used was a V/Cu-based composite material. Experiments show that a single filler cannot effectively inhibit the formation of Ti Fe intermetallic compounds, and only two or more fillers can achieve the inhibition effect. used Ti+Zr-based 40Ti-20Zr-20Cu-20Ni solder, silver-based Ag-6Pd solder, nickel-based BNi2 and BNi7 solder to braze Ti-6Al-4V titanium alloy and STS304 stainless steel. Welding experiment. Experiments have proved that Ni in the Ni-based filling material can effectively act as a stabilizing element, thereby reducing the transition temperature of the β phase. For Ag-based filler materials, although other materials can be added to increase the strength of the welded joint, the poor affinity of Ag and Ti cannot effectively improve the diffusion of the filler material. Wetting angle and the number of atoms diffused into the steel side base material BNi7≥BNi2>40>Ag-5Pd. The microstructure of the explosive welding joint zone of titanium and 20 steel was analyzed. The steel side and the titanium side base metal at the welding interface contained high-density dislocations. Among them, the steel side appeared equiaxed fine crystals and deformation. Long grain area. A composite interface fused with each other can be observed in the bonding zone, indicating that the high energy generated by the explosion melts the interface metal, and the spraying and quenching of liquid metal causes the appearance of microcrystals, micro twins and metastable phases of titanium in the bonding zone. Using pure Ag as a filler material for pressure diffusion welding of industrial pure titanium and 304 stainless steel, experiments show that Ag can effectively inhibit the formation of brittle intermetallic compound Ti-Fe, and the intermetallic compound formed by Ag has a strong bearing capacity, thereby improving welding The strength of the joint.

Dissimilar metal welding refers to the joining of two different types and properties of metal materials through a specific welding process to form a structural component with integrity and expected performance. The thermal conductivity and linear expansion coefficient of titanium alloy and dissimilar metals are quite different, and brittle intermetallic compounds are easily formed during the welding process, which leads to the deterioration of the strength of the welded joint. Therefore, it is very necessary to add appropriate intermediate transition metals and select appropriate welding processes and welding methods in the welding process to improve the microstructure and mechanical properties of welded joints.
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Improve surface quality and performance of titanium plate

A significant feature of the titanium plate is its strong corrosion resistance. This is because it has a particularly strong affinity for oxygen and can form a dense oxide film on its surface, which can protect titanium from corrosion by the medium. , Neutral salt solution has good stability in neutralizing oxidizing medium, and it has better corrosion resistance than existing stainless steel and other commonly used non-ferrous metals, and even comparable to platinum. 

The quality of the titanium plate is largely determined by the smelting process, including the chemical composition of the titanium, the cleanliness of the titanium water (gas, harmful elements, inclusions) and the quality of the casting (component segregation, decarburization and surface conditions) These aspects are the key control points of smelting operations. In addition, industrial titanium plates also require sufficient hardenability to ensure uniform microstructure and mechanical properties across the spring section. The main cause of fatigue cracks in the oxide inclusions in titanium and the damage of type D inclusions to fatigue life is greater than that of type B inclusions. Therefore, foreign titanium factories and automobile factories have put forward higher requirements for oxide inclusions in industrial titanium plates. In particular, Al2O3 and TiN inclusions are the most harmful to the fatigue life of titanium springs. In order to produce high-quality industrial titanium plates, special smelting methods such as electric furnace-electro slag remelting or vacuum arc remelting are usually used in the past.
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Characteristics of chemical, physical and mechanical properties of titanium

1. The density of metal titanium is 4.51g/cm3, which is higher than aluminum but lower than steel, copper, and nickel, but its specific strength is the first among metals. The melting point of titanium is 1660±10°C. The boiling point is 3287°C. The valences are +2, +3 and +4. It has good corrosion resistance and is not affected by the atmosphere and seawater. At room temperature, it will not be corroded by dilute hydrochloric acid, dilute sulfuric acid, nitric acid or dilute alkali solution; only hydrofluoric acid, hot concentrated hydrochloric acid, concentrated sulfuric acid, etc. can act on it.

2. Metal titanium dust is explosive and will burn and explode when exposed to heat, open flames or chemical reactions. Its powder has high chemical activity and can ignite spontaneously in the air. Metal titanium can not only burn in air, but also in carbon dioxide or nitrogen. It is easy to combine with halogen, oxygen, sulfur and nitriding at high temperature. Use dry powder and dry sand to extinguish the fire when titanium is burned. It is strictly prohibited to use water, foam and carbon dioxide to fight the fire. In the event of high heat or violent burning, fighting with water may cause an explosion.

3. Titanium is highly active, not only in the molten state, even in the solid-state above 400 ℃, it is also easily polluted by moisture, air, grease and oxides, and absorbs oxygen, nitrogen, hydrogen, carbon, etc. The plasticity and toughness of welded joints decrease, causing pores and cracks. The main hazards of iron pollution to titanium are the formation of brittle titanium-iron compounds during welding and heating, which reduces the mechanical properties and corrosion resistance of the weld; under the action of corrosive media, surface iron particles cause pitting corrosion and hydrogen embrittlement.

4. The linear expansion coefficient of titanium is about 2/3 of carbon steel, which is equivalent to 50% of stainless steel. The thermal conductivity of titanium is 4.5 times smaller than that of carbon steel and lower than that of stainless steel.

5. Titanium has obvious resilience, and its resilience is 2 to 3 times that of stainless steel during cold forming. Like stainless steel, adhesion occurs easily. The tensile strength of titanium decreases with increasing temperature. When the temperature reaches 250 degrees, its tensile strength is only 50% of room temperature.

6. The plasticity of industrial pure titanium has a special relationship with temperature, from room temperature to 200. At C, the relative elongation of titanium increases, and then it begins to decrease when the temperature continues to rise. The relative elongation reached a minimum at 450~500 and then increased significantly. Therefore, the use of temperature does not exceed 350°C.
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Welding problems of dissimilar metals such as titanium alloy and steel

Titanium alloys are widely used in aerospace, medical equipment and other industries due to their advantages such as high specific strength and thermal conductivity, good corrosion resistance and biocompatibility. Due to the particularity of dissimilar metal connection, common methods include diffusion welding, friction stir welding, fusion brazing, laser welding, cold pressure welding and other special connection techniques. Studying the welding of titanium alloys and dissimilar metals is an effective way to give full play to the excellent properties of titanium alloys and expand its application range.

Titanium alloy/steel dissimilar welding composite structure not only has high specific strength and good corrosion resistance of titanium alloy, but also is compatible with the advantages of wide application range and low price of steel materials. However, due to the large difference in thermal conductivity and linear expansion coefficient between titanium alloy and steel, and poor mutual solubility, brittle and hard Ti-Fe intermetallic compounds are easily formed during welding, making it difficult to weld dissimilar titanium alloy/steel . In order to solve these problems, the researchers conducted in-depth research and analysis on the diffusion welding, brazing, explosive welding and other welding technologies of titanium alloy/steel dissimilar metals.

Ti6Al2Zr2Mo2V titanium alloy and 304 austenitic stainless steel were electron beam welded, and the filler material used was a V/Cu-based composite material. Experiments show that a single filler cannot effectively inhibit the formation of Ti Fe intermetallic compounds, and only two or more fillers can achieve the inhibition effect. Lihang Titanium has used Ti+Zr-based 40Ti-20Zr-20Cu-20Ni solder, silver-based Ag-6Pd solder, nickel-based BNi2 and BNi7 solder to braze Ti-6Al-4V titanium alloy and STS304 stainless steel. Welding experiment. Experiments show that Ni in the Ni-based filling material can effectively act as a stabilizing element, thereby reducing the transition temperature of the β phase. For Ag-based filler materials, although other materials can be added to increase the strength of the welded joint, the poor affinity of Ag and Ti cannot effectively improve the diffusion of the filler material. Wetting angle and the number of atoms diffused into the steel side base material BNi7≥BNi2>40>Ag-5Pd. The microstructure of the explosive welding joint zone of titanium and 20 steel was analyzed. The steel side and the titanium side base metal at the welding interface contained high-density dislocations. Among them, the steel side appeared equiaxed fine crystals and deformation. Long grain area. A composite interface fused with each other can be observed in the bonding zone, indicating that the high energy generated by the explosion melts the interface metal, and the spraying and quenching of liquid metal causes the appearance of microcrystals, micro twins and metastable phases of titanium in the bonding zone. Using pure Ag as a filler material for pressure diffusion welding of industrial pure titanium and 304 stainless steel, experiments show that Ag can effectively inhibit the formation of brittle intermetallic compound Ti-Fe, and the intermetallic compound formed by Ag has a strong bearing capacity, thereby improving welding The strength of the joint.

Dissimilar metal welding refers to the joining of two different types and properties of metal materials through a specific welding process to form a structural member with integrity and expected performance. The thermal conductivity and linear expansion coefficient of titanium alloy and dissimilar metals are quite different, and brittle intermetallic compounds are easily formed during the welding process, which leads to the deterioration of the strength of the welded joint. Therefore, it is very necessary to add appropriate intermediate transition metal, select appropriate welding process and welding method in the welding process to improve the microstructure and mechanical properties of the welded joint.
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Production and application of titanium and titanium alloy pipes at home and abroad

There are 8 main titanium producing countries in the world. According to the output ranking, they are the United States, Russia, Japan, China, the United Kingdom, France, Germany and Italy. In recent years, driven by the economic growth of Asian countries including China and Japan, especially the rapid increase in the amount of titanium used in petrochemical and military industries with China as the core, the demand for titanium in the world has increased rapidly. Increase in double-digit rates every year. The United States is the world's largest demand for titanium materials. It is also the largest country in production, with an output of more than 35,000 tons in 2012; Russia's titanium output ranks second in the world, with an output of about 30 thousand tons in 2012; China produced about 28,000 tons of titanium in 2012, and it is expected to exceed 3.0 in 2013 10,000 tons; Japan's production in 2012 also reached about 19,000 tons; Europe's titanium output has not changed much in the past two years. 

However, compared with the advantages of developed countries in the deep processing and application of titanium materials, the development of domestic titanium materials is still relatively extensive, and most of them are still in the processing of raw materials or crude products. A small number of finished products with higher technical content are mainly used in military products. It cannot be widely promoted to the civilian field for reasons such as cost.
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Rolling method of titanium thick wall tube, titanium seamless tube and titanium alloy tube

Titanium pipes can be divided into two categories: seamless pipes and welded pipes, which can be further divided into hot-extruded pipes, hot-rolled pipes, cold-rolled pipes, welded pipes, and welded-rolled pipes. Cross rolling (two-roll or three-roll through the mill) method of production. Thin-walled seamless titanium tube (small diameter) needs to be cold-rolled or drawn. Some titanium alloys have low plasticity in cold rolling and are prone to cracking. In order to improve the rollability of titanium alloy tubes, warm rolling can be used.

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What are the differences between hot rolled titanium plate and cold rolled titanium plate?

Titanium is a metal with light density, high specific strength, non-magnetic, and easy to process and shape. Titanium and titanium alloys have excellent corrosion resistance to most acid, alkali, and salt solutions. In corrosive media, such as the presence of chloride ions At times, its corrosion resistance is significantly higher than that of steel (including stainless steel), and its corrosion resistance in seawater is almost comparable to platinum.

The carbon content of hot-rolled titanium plate is relatively higher than that of cold-rolled titanium plate. This is because cold-rolled titanium plate will be ground and cold-rolled again on the basis of hot-rolled titanium plate, so as to absorb the surface of hot-rolled titanium plate The C element in the titanium dioxide is removed. The density of cold-rolled titanium plate and hot-rolled titanium plate are the same with little difference in composition. The details also depend on the composition. Hot-rolled titanium products only have very good ductility, and titanium materials are also subject to pressure effects.

Hot-rolled titanium products are divided into layout titanium, low-carbon titanium, welded bottle titanium, and then find the titanium material you need based on various titanium materials, and check the density and composition of the specific titanium material.

Hot-rolled titanium products have low hardness, simple processing and good ductility.

The cold-rolled sheet has high hardness and is relatively difficult to process, but it is not easy to deform and has high strength.

 Hot-rolled titanium products have relatively low strength and poor surface quality (oxidation\low finish), but good plasticity, usually medium-thick plates, cold-rolled plates: high strength, high hardness, high surface finish, usually thin plates, As a stamping board.

The production process of hot-rolled titanium product sheets and cold-rolled titanium product sheets is different. Hot rolled titanium products are rolled at high temperature, and cold rolled is rolled at normal temperature. Generally speaking, cold-rolled titanium product sheets have very good strength, and hot-rolled titanium product sheets have very good ductility. The thickness of cold-rolled is usually smaller, and the thickness of hot-rolled can be larger. The surface quality, appearance, and dimensional accuracy of cold-rolled titanium products are better than hot-rolled plates, and the thickness of their products can be rolled as thin as about 0.18mm, so they are more popular. Regarding the inspection of goods, professionals can be asked to do it.

The mechanical properties of hot-rolled titanium products are far inferior to cold processing and inferior to casting processing, but they have better resistance and ductility.
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Can the titanium tube be used at low temperature?

Titanium is a rare metal element, and its performance is far beyond what we have seen. General power generation equipment, especially the side with a lower thermal cycle temperature, provides an ideal environment for titanium.

It is possible to develop a new type of titanium tube that can be used at a higher working temperature. Compared with the developed high-strength low-temperature titanium tube, it will have greater potential in saving metal and improving efficiency. The goal is to develop a titanium tube that can be used at a temperature of 650°C. This alloy can be used on high-pressure turbine wheels and can reduce weight by 20% compared with the commonly used base wheels.

However, with the increase of working temperature, titanium tubes will inevitably bring more new problems, such as surface oxidation, long-term stability of mass metallurgical production, friction corrosion, fire hazard, and hot salt stress corrosion. Some problems can be solved by surface coating or surface treatment. For this reason, research in this area is currently being actively carried out.
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The advantages and recognition of pure titanium and titanium alloy spectacle frames:

Titanium metal has good corrosion resistance, similar to platinum (commonly known as platinum), its mechanical properties are excellent, its texture is light, and its unit weight is only 48% of general metal. Therefore, titanium is an ideal spectacle frame material because it has nothing to do with it. It is relatively light, flexible, and corrosion-resistant. However, the production cost of titanium and titanium alloy glasses is relatively high, and there are special high requirements on the process in cutting, stamping, welding and electroplating (for example welding must be done in a vacuum), so the price is relatively expensive.

With the increasing maturity of the research and development of titanium materials and the increasing maturity of processing technology, a variety of titanium-based frames such as pure titanium, B titanium, and memory titanium have appeared on the market. Among them, the purity of the pure titanium frame is required to reach 99.9% (excluding gaskets, screws, stipules and leg sleeves), and its logo is called PURE TITANIUM, or Ti-P for short. However, individual manufacturers have also carried out the above markings on some non-pure titanium or titanium alloy materials driven by their interests. In addition, the majority of consumers have insufficient ability to distinguish pure titanium frames, resulting in the appearance of frames after consumers wear titanium frames. Phenomena such as rust and skin allergies harm the interests of consumers. Here are a few simple methods to identify pure titanium spectacle frames.

1. Weight by hand, usually the specific gravity of the alloy frame is about 8.9g/cm3, and the specific gravity of the pure titanium frame is about 4.5g/cm3. Since the weight of the titanium material is equivalent to half of the alloy frame, it is lighter by hand. This is one of the easiest ways to distinguish between a titanium frame and a non-titanium frame.

2. Observe the welding points of the nose pad stem and the nose pad bucket. The welding of pure titanium material is a vacuum and oxygen-free butt welding. This is one of the effective ways to distinguish between the titanium frame and non-titanium frame.

3. Observe whether there is a gasket at the hinge joint. The pure titanium frame should not make direct contact between titanium and titanium at the hinge part, otherwise, the joints will be wrinkled and the temples will not open and close smoothly. Usually, two thin spacers are embedded in the hinge part of the pure titanium frame to separate the upper and lower hinges. Therefore, checking whether there is a gasket at the hinge is also a good way to identify whether a pure titanium frame.

4. Use a magnet as a magnetic response, loosen the hinge of the frame as much as possible, and use the magnet to attract it in a freely movable state. If the temple is swayed under the attraction of the magnet, it means that the frame is not pure titanium. The frame may be a pure titanium frame.
Grade 9 Titanium Plate     titanium sheet     Zirconium Sputtering Target     Titanium Aluminum Sputtering Target

Application range of titanium and titanium alloy bellows

Titanium is called the metal of the 21st century due to its excellent comprehensive properties. Although the price ratio of titanium and titanium alloy bellows to stainless steel bellows is very high (about 10:1), the life of steel equipment is only 2 to 3 years. Titanium bellows The service life of the tube can reach more than 20a, and there is almost no need for repair costs. From the long-term and comprehensive economic benefits, the use of titanium bellows is still very cost-effective. At present, due to cost and manufacturing technology and other reasons, titanium and titanium alloy bellows can only be used in high-tech industries such as aviation, aerospace and high-energy physics in our country, while chemical and oil refining industries are rarely used. It can be expected that with the development of science and technology in our country, the application of titanium will become more and more extensive.

Titanium bellows are generally used in occasions with high-performance requirements, such as lightweight and high flexibility, and also used in fields with high corrosion resistance requirements. Titanium and titanium alloy bellows have broad application prospects in chemical plants such as saltworks, fertilizer plants, and alkali plants. The chemical industry has high requirements for the corrosion resistance of bellows. Stainless steel can no longer meet the actual production needs. The use of titanium and titanium alloy bellows is a development trend. For example, when alkali plants and chemical plants are used for mother liquor heat exchange, due to the high concentration of CL-in the medium, there is corrosion to stainless steel. The use of titanium bellows can effectively prevent corrosion. For example, a chemical plant in the United States used (254mm) hydroformed titanium wave expansion joints in the pipeline for transporting acetic acid; titanium bellows heat exchanger developed by a Beijing company for the salt chemical industry and marine chemical industry has been used in some chemical plants, The use effect is good.

In the oil refining industry, the most used bellows are the wave expansion joint. Bellows expansion joints are widely used in catalytic cracking units in the oil refining industry. The bellows (wave expansion joints) used in the oil refining industry have high requirements for corrosion resistance. The characteristic is that the pipe diameter is large, the bellows are easy to be corroded, and the damaging effect occurs. The main reason is corrosion damage, which accounts for about 80% of the damage loss of the bellows expansion joint. In recent years, with the increase in the content of corrosive media in crude oil, the development of heavy oil catalytic cracking technology, and the increase in the operating temperature of the device, the working conditions of the bellows have become more severe. The corrugated expansion joints in the catalytic cracking unit of an oil refinery often go through a production cycle. Corrosion damage occurs in a few months or even a few hours of operation and needs to be replaced. This seriously affects the safe operation of the equipment and the performance of economic benefits. An urgent problem for each refinery. Therefore, it should be a development trend to use titanium and titanium alloys to replace stainless steel. A Japanese company has used titanium wave expansion joints in the oil refining industry. Various performance experiments have shown satisfactory results, paving the way for practical applications.
grade 1 titanium foil     Titanium Clad Copper     ASTM B861 25*1.2mm Titanium Tube For Chemical     Titanium Planar Target

How does the shrinkage behavior of the titanium tube change?

Titanium tube is similar to other metals. The shrinkage behavior of titanium tube during casting also undergoes a change from liquid to solid state and then to solid-state. This shrinkage behavior is usually divided into volume shrinkage and linear shrinkage. The volume shrinkage reflects the change of the entire volume of the titanium tube during the casting process. Since the total volume shrinkage is equal to the volume of the concentrated shrinkage cavity of the casting plus the volume of the shrinkage porosity, the solidification shrinkage behavior of the alloy casting process is related to the volume shrinkage of the alloy. It determines the characteristics of the shrinkage cavity and shrinkage porosity of drill alloy, which is of great significance for understanding the formation of shrinkage cavity and shrinkage porosity defects of titanium pipe.

Important factors affecting the solidification and shrinkage of titanium tubes include alloying elements, mold materials and mold structures. Because alloying elements affect the crystallization temperature interval of the titanium tube, just like its influence on fluidity, the solidification shrinkage of the titanium tube firstly depends on the characteristics of the added alloying element, that is, the crystallization temperature formed between titanium and alloying elements The size of the interval is related. Eutectic titanium tubes with narrow crystallization temperature intervals have good fluidity and are easy to form concentrated shrinkage cavities, while titanium tubes with wide crystallization temperature intervals have poor fluidity and are easy to form dispersive shrinkage cavities, that is, shrinkage porosity.

Because titanium tube has a series of good physical properties, as an excellent structural material, it can compete with stainless steel and nickel alloy for the scope of application: in many sectors of the national economy, the use of titanium tube increases product life and improves The reliability and productivity of the equipment have speeded up the process and improved working conditions, all of which have achieved significant economic benefits.
Gr23 Ti-6Al-4V ELI Titanium Bar     Gr1 Pure Titanium Wire     Gr9 Ti3Al2.5V Titanium Pipe     Gr1 Pure Titanium Tube

Classification of mechanical properties of titanium materials The properties of metal materials can be divided into:

Mechanical properties: The resistance of metal materials under different external forces, also called mechanical properties. Such as elasticity, plasticity, strength, hardness, toughness, etc. The mechanical properties are stipulated in the standard, you can see the standard, there are high-temperature performance, low-temperature performance, we usually say that the performance is normal temperature performance.

Physical properties: such as electrical conductivity, thermal conductivity, thermal expansion, melting point, magnetism, density, etc.

Chemical properties: such as acid and alkali resistance, corrosion resistance, and oxidation resistance.

The above three properties are collectively referred to as usability.

Process performance: The performance of the material in processing and manufacturing shows the degree of difficulty in processing and manufacturing, such as titanium castability, forge ability, weldability, machinability, heat treatment, etc., the bending of titanium plates, the bending of titanium tubes Flattening and flaring.

Some people confuse physical properties with mechanical properties. They often say that sampling is done for physical testing, but it is actually doing mechanical performance testing. His statement is wrong.

Note: Mechanical properties and physical properties are different concepts

The physical properties are inherent in itself and generally do not need to be tested.
Gr1 Pure Titanium Foil     Gr7 Ti-0.2Pd Titanium Sheet     Gr3 Pure Titanium Plate     Gr1 Pure Titanium Sheet

Clean technology of titanium alloy

Before welding titanium, it is important that the welding joints and welding wires do not have oxide scale, dust, grease, oil, moisture and other potential contaminants. Including these foreign substances in the titanium, weld metal will reduce performance and corrosion resistance. The welding wire packaged by the manufacturer is clean. If the wire looks dirty, it is best to wipe it with a non-chlorinated solvent before use. In severe cases, pickling may be required. All bonding surfaces and surfaces of the substrate must be cleaned at least one inch away from the joint.

The surface of ordinary pickling machines usually only needs to be scrubbed with household thinner or detergent, and then rinsed thoroughly with hot water and air drying. In addition, if there is no residue, use a clean lint-free cloth or cellulose sponge to wipe the weld and adjacent areas with a chlorine-free solvent such as toluene, toluene or methyl ethyl ketone (MEK). These solvents are particularly effective in removing trace amounts of grease and oil. A new stainless steel brush should be used for solvent cleaning. In any case, steel brushes or steel wool should not be used on titanium due to the risk of corrosion resistance caused by embedded iron particles.

The light oxide film, formed by heating in the range of 600°-800°F (316-427°), can be removed by brushing with a new stainless steel wire brush. Light grinding, filing and pickling are also effective. An acceptable acid bath for titanium is to use 35 vol% nitric acid (70% concentration) and 5% hydrofluoric acid (48% concentration) at room temperature. Soaking the welding area for 1 to 15 minutes (depending on the activity of the bathtub) should be sufficient.

Rinse with cold water to remove acid, then rinse with hot water to facilitate drying and complete the cleaning. Heavy scale and oxygen-contaminated surfaces that may exist after high-temperature heat treatment are best removed by mechanical methods. Grinding and sanding or sandblasting are usually used. Although useful, molten caustic baths require care to minimize the possibility of hydrogen absorption. After descaling, pickling should be used to remove all residues and improve surface appearance.

Once cleaned, joints should be carefully stored. Handling should be reduced as much as possible, and welding should be started as soon as possible after cleaning. When not working, the welds should be covered with paper or plastic to avoid the accumulation of contaminants.
Gr7 Ti-0.2Pd Titanium Foil     Gr12 Ti-0.3Mo-0.8Ni Titanium Plate     F5 Titanium Forging     F1 Pure Titanium Forging