Ti31 is a new high temperature biphase (α+β) titanium alloy, belonging to the Ti-Al-Zr-Mo-Ni alloy, with excellent strength, overall cracking resistance, excellent corrosion resistance, high temperature stability and excellent tempering resistance. At room temperature, the tensile strength is 970MPa, the yield strength is 900MPa, and the elongation is 12%. At 350℃, the tensile strength is 510MPa, the yield strength is 400MPa, and the elongation is 17%, which is widely used in the nuclear industry, aerospace, ships and other fields.