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TA4 is a kind of titanium - aluminum alloy. Its tensile strength is slightly higher than that of industrial pure titanium, and it can be used as a structural material with moderate intensity. It is mainly used to do welding wire at home. The chemical composition of TA4 titanium alloy, aluminum 2 ~ 3.3, iron 0.30, silicon 0.15, carbon 0.10, nitrogen 0.05, hydrogen 0.015, oxygen 0.15.

TA5 is a kind of A type titanium alloy, which contains 4% aluminum and 0.005% boron. Its tensile strength is higher than that of industrial pure titanium, but the plastic is a bit poor, it has good welding performance and corrosion resistance. This kind of titanium alloy can be used as a structural material in the seawater corrosion environment, and it has been successfully used in the shipbuilding industry at present. The chemical composition of TA5 titanium alloy, aluminum 3.3 ~ 4.3, boron 0.005, iron 0.30, silicon 0.15, carbon 0.10, nitrogen 0.04, hydrogen 0.015, oxygen 0.15.

TA5 is a kind of A type titanium alloy, which contains 5% aluminum and 0.015% silicon. Its tensile strength is higher than that of TA6, but its ductility is worse than that of TA5, and it has good welding performance and corrosion resistance. The chemical composition of TA6 titanium alloy, aluminum 4 ~ 5.5, iron 0.30, silicon 0.15, carbon 0.10, nitrogen 0.05, hydrogen 0.015, oxygen 0.15. The main physical properties of TA6 titanium alloy: density 4.4 g / cm, a+ beta / beta phase transition point, 1000 to 1020 degrees Celsius, resistivity 1.08 ohm mm 2/ meters.

TA7 is a kind of titanium, aluminum and tin three element system titanium alloy, which contains 5% aluminum and 2.5% tin. In the annealed state, it has moderate intensity (80 kg / mm or so), enough plastic and good welding performance. It can be used as body material below 500 degrees. At a short time, its using temperature can be up to 900 degrees. When the content of interstitial element is very low, this kine of titanium alloy has excellent toughness and comprehensive properties at low temperature (-253 C), which is an excellent low temperature titanium alloy. The chemical composition of TA7 titanium alloy: Aluminum 4 ~ 5.5%, tin 2 ~ 3%, iron 0.3%, silicon 0.15%, carbon 0.1%, nitrogen 0.05%, hydrogen 0.015%, oxygen 0.2%.