Titanium alloys have three matrix structures: industrial pure titanium is divided into three grades: TA1, TA2 and TA3 according to its impurity content. The interstitial impurity elements of these three types of industrial pure titanium gradually increase, so their mechanical strength and hardness also increase. As it increases step by step, the plasticity and toughness decrease accordingly.
The commonly used industrial pure titanium in industry is TA2, because of its moderate corrosion resistance and comprehensive mechanical properties. TA3 can be used when higher wear resistance and strength requirements are required. TA1 can be used when better molding performance is required.
TA1, TA2 and TA3 in the national standard correspond to Gr0, Gr1 and Gr2 in the UNS.
TA1 and TA2 have good low-temperature toughness and high low-temperature strength when the iron content ω is 0.095%, the oxygen content ω is 0.08%, the hydrogen content ω is 0.0009%, and the nitrogen content ω is 0.0062%, and can be used as Low temperature structural materials below -253℃.
The chemical composition of TA1 and TA2 grades should comply with the corresponding provisions of GB3620-83. The chemical composition of the cladding metal should comply with the provisions of JISH4600. The United States researched and put into industrial production of composite materials much earlier than our country. However, in ASTMA263 "Specification for Corrosion-Resistant Chromium Steel Composite Steel Plate", ASTMA264 "Specification for Chromium-Nickel Stainless Steel Composite Steel Plate", ASTMA265 "Specification for Nickel and Nickel Alloy Composite Steel Plate", ASTMB898 "Specification for Active and Corrosion-Resistant Metal Composite Plate", the cladding material is The regulations only stipulate that the chemical composition of materials should meet the requirements of corresponding material standards.
