Titanium and titanium alloy seamless tubes have the characteristics of low relative density, high specific strength, large yield ratio, good plastic deformation and ductility, low heat transfer coefficient, and high tensile strength of titanium. Titanium is so stable that it is difficult to develop designs, smelters and even apply it, so it is not common for everyone to think that way. In fact, the reserves of titanium account for 0.6% of the area, ranking ninth, and the reserves are very large. The low activity of titanium lies in the condition. Titanium is very stable in the indoor temperature and air, and it is not easy to reflect. As everyone knows, it has strong organic chemical activity at high temperature, and it is very easy to react with a variety of vapors. Titanium is a metal material, its heat transfer coefficient is very fast, but much slower than some general metal materials. According to the current data, the heat transfer coefficient of titanium is close to that of stainless steel, about one-fourth that of aluminum and one-fifth of that of iron. It has great potential for development in the automotive industry.
The application of titanium and AMS 4900 CP Titanium Plate alloy seamless pipes in the shipbuilding industry is mainly to use its high-quality corrosion resistance, low density, memory capacity, non-magnetic and other characteristics. Titanium and titanium alloys are widely used in strategic nuclear submarines, free submersibles, nuclear icebreakers, hydrofoils, hovercraft, demining vessels, propellers, whip antennas, sea pipelines, coolers, heat exchangers, acoustic material equipment, security equipment, etc. , The scope of application of titanium alloys includes: industrial production of pure titanium, titanium-zirconium alloy, titanium alloy, and titanium alloy.
(1) All titanium boats. F1 has very good social experience in the production of titanium boats. In the 1990s, all-titanium wooden boats or motorboats were manufactured by New Shipyard and Jiangteng Shipyard. All-titanium ships have the advantages of lighter weight, faster speed, small diesel engines, low fuel costs, less carbon dioxide emissions, no surface coating, and easy cleaning of accessories. The disadvantages are the increase in raw material costs and the large difficulty of production and processing. , Strict safety protection regulations. Experimental results show that the ship’s speed reliability, vibration and noise are all very good.
(2) The molecular driving force ship. Titanium alloys are used to replace stainless steel plates in the production of steam generators, heat exchangers and ship cooling towers, which are free from erosion damage. titanium bicycle tubing steam engines are widely used in power stations of Russian nuclear icebreakers. The selection of titanium alloy can increase the service life of diesel engines by more than 10 times.
(3) Propeller. The raw materials of the propeller are specified to have high compressive strength, excellent fatigue characteristics, abrasion resistance and cavitation corrosion resistance in the sea surface material. Titanium alloys can be specified in consideration of the comprehensive type. For the first time, the U.S. Navy used a 1500mm diameter, four-leaf demountable titanium alloy propeller on a hydrofoil. The hydrofoil motorboat propeller was developed in China in 1972. At this stage, various specifications and models of titanium alloy propellers have been produced, with a diameter of 450-1700mm. It can produce titanium alloy fixed propellers with a diameter of 1200mm and a quality of 135kg. Long-term application instructions, the life of titanium alloy propellers is more than 5 times that of alloy copper propellers.
(4) Marine pumps, gate valves and pipelines. Pumps, gate valves and pipes made of copper and stainless steel plates have a service life of only 2-5 years because of extreme working standards. The dismantled titanium alloy has good actual effect and is suitable for moving sea surface pipelines with large flow. The Russian ship pipeline service life standard has three service life regulations, that is, the initial connection guarantee period is 8-9 years; the service life is not less than 15 years; the full service life of various vessels should be reliably operated within 25-30 years .
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