Determination of Nitrogen Content in Sponge Titanium, Titanium and Titanium Alloys

Nitrogen in titanium alloys mainly exists in the form of nitrides, such as TiN, VN, FeN, etc., and only a small part of nitrogen exists in the form of atoms. Excessive nitrogen content in titanium alloys will lead to loose macrostructure and even the formation of bubbles. It reduces the toughness, increases the hardness, and increases the sensitivity of the notch, which greatly hinders the application of titanium and titanium alloys. Therefore, in the production of titanium and titanium alloy tubing, it is necessary to accurately analyze the nitrogen content in sponge titanium, titanium, and titanium alloys, and strictly control its content to ensure product quality. Due to the high melting point of nitrides in titanium and titanium alloys (for example, the melting point of titanium nitride is 2950°C), it is difficult to directly determine its content by pulse inert gas melting method. Through the selection and combination of different graphite crucibles, fluxes, sample weights, and heating power, researchers have realized the use of LECO's TC600 oxygen and nitrogen combined detector pulse inert gas melting-thermal conductivity method to test sponge titanium, titanium, and Titanium Alloy Seamless Rectangular Pipe. Determination of nitrogen content.

The principle of the experiment is as follows: put the sample into a graphite crucible with flux, protect it with an inert gas (helium), and release oxygen and nitrogen at a sufficient temperature. Oxygen combines with carbon to form CO and nitrogen is released as N2. The gas released by the sample is carried by the inert gas through the heated rare earth copper oxide, so that CO is converted into CO2, H2 is converted into H2O, CO2 is absorbed by soda asbestos, and H2O is absorbed by anhydrous magnesium perchlorate. Then, nitrogen enters the thermal conductivity measurement cell in the form of N2, and the output of the Wheatstone bridge is integrated and compared with the reference material to respond, which is displayed in the form of nitrogen percentage.

The test results are as follows: using a high-temperature graphite crucible preloaded with 0.050g of high-purity graphite powder, and using a high-purity nickel basket as a flux, the best test conditions for the combined measuring instrument are: degassing power 5600W, analysis power 5000W, degassing time 20s, cooling time 15s, flushing time 15s, integration time 65s. Through the measurement of standard samples and comparison with the data of other units, and put into production testing, it is proved that the method is easy to operate, fast in analysis speed, and the accuracy and precision of data meet the needs of scientific research and production.

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Titanium alloy has good mechanical properties at room temperature and high temperature, excellent fatigue resistance and cracks propagation resistance. It has been widely used in the manufacture of pressure vessels on spacecraft missiles, rocket engine shells, aircraft skins, ribs, and webs. 

Application of titanium alloy in bicycle industry

At present, in the bicycle industry, especially in the high-end bicycle industry, people are increasingly pursuing high-quality driving experience, and require bicycles to be safe, reliable, and light. Titanium bicycles are high-end bicycles that have become popular in the world. In order to further To lighten the weight of the vehicle body, the manufacturer hopes to change the frame tube from a straight tube with equal diameter to a tube with a variable inner diameter and wall thickness. The characteristic of this kind of pipe is that the outer diameter is constant, and the inner diameter is small at both ends and large in the middle, so it is difficult to produce this kind of titanium welded tube. According to the needs of users, a new technology was used for trial production. After nearly a year of hard work, the trial production was successful and samples were provided to foreign manufacturers. Now, has designed and manufactured a special machine tool that can mass-produce such pipes. Under the control of the computer, it can produce different specifications of inner diameter reducing pipes and realize industrialization.

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Titanium hydride powder, The product is a dark gray irregular powder. Use Titanium powder and Titanium Hydrogenate Powder are a very widely used metal powder.

Titanium is prone to crevice corrosion in some media

Titanium is prone to crevice corrosion in some media. Structural design should eliminate gaps and recesses that can store water as much as possible. The gap between the titanium plate and the titanium plate is also susceptible to corrosion, especially the gap formed by titanium and tetrafluoroethylene. Because titanium is not corrosion-resistant to solutions containing a small amount of soluble fluoride, fluoride causes passivation damage. Therefore, special care should be taken when using PTFE plastic gaskets, fluorine-containing rubber gaskets and adhesives. Its strength index decreases with the increase of temperature, and the mechanical properties of titanium change with temperature. For example, the tensile strength and yield strength at 250 to 300 ° C are half of those at room temperature. Even when the design temperature is not high, therefore. It should also be selected according to the strength value at the design temperature. grade 2 titanium sheet has a high yield ratio and good durability. When the design temperature is below 316°C, the tensile strength value at this temperature is often what determines the design strength index. For industrial pure titanium, the strength index value cannot be improved by heat treatment. When Titanium Threaded Forged Fitting is used in combination with other materials, the thermal expansion coefficient of titanium is small. Pay attention to the stress caused by the expansion difference.

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Titanium Weld Neck Flanges are flanges that designed to be joined to a piping system by butt welding. The gradual transition of thickness from the base of the hub to the wall thickness at the butt weld provides important reinforcement of the Titanium Weld Neck flange. The bore of the Titanium Weld-Neck flange matches the bore of the pipe, reducing turbulence and erosion.

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Grade 1 Pure Titanium Sheet/Plate

1. Grade 1 titanium has excellent corrosion and wear resistance.
2. It can be used in the aerospace, marine, and chemical industries.
3. It has 3 delivery states: M (Annealed), Y (Cold Rolled), R (Hot Rolled)

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Rolling method of titanium thick-walled pipe, titanium seamless pipe and titanium alloy pipe

Titanium pipes can be divided into seamless pipes and welded pipes, which can be further divided into hot extruded pipes, hot rolled pipes, cold rolled pipes, welded pipes and Grade 3 Pure Titanium Tube. Thick-walled titanium pipes can be hot extruded or hot rolled. Cross-rolling (two-roll or three-roll mill) method of production. Thin-walled seamless titanium tubes (small diameter) need to be made by cold rolling or stretching. 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.