There are three types of domestic industrial pure titanium equipment: TA1, TA2, and TA3. The difference lies in the content of impurities containing hydrogen, oxygen and nitrogen. These impurities strengthen industrial pure titanium, but the plasticity is significantly reduced. Although the strength of industrial pure titanium is not high, it has excellent plasticity and toughness, especially good low-temperature impact toughness; at the same time, it has good corrosion resistance. Therefore, this material is mostly used in the chemical industry, petroleum industry, etc., in fact, it is mostly used in working conditions below 350°C. According to the room temperature structure of the annealed titanium alloy, titanium alloys can be divided into three types: α-type titanium alloy, (α+β)-type titanium alloy and β-type titanium alloy.
Among α-type titanium alloys, TA4, TA5, TA6 type Ti-AI alloys and TA7, TA8 type Ti+AI+Sn alloys are more commonly used. The strength of this alloy can reach 931MPa at room temperature, and it has stable performance at high temperatures (below 500°C) and good weldability. The application of β-type titanium alloy in my country is relatively small, and its application range needs to be further expanded.
