+ type titanium alloy welded pipe excellent in strength and rigidity in the longitudinal direction of pipe and method for manufactu the same

摘要

+ type titanium alloy welded pipe containing 0.8 to 1.5% Fe, 0.02% or less N in terms of mass%, Q represented by the formula (1) being 0.34 to 0.55 , The balance being Ti and impurities, the tensile strength in the longitudinal direction of the pipe exceeding 900 MPa and the Young's modulus in the longitudinal direction of the pipe exceeding 130 GPa, strength and rigidity in the longitudinal direction of the pipe Excellent + type titanium alloy welded pipe.Q = [O] + 2.77 [N] + 0.1 [Fe] (1)Here, [Fe], [O] and [N] are contents [mass%] of each element.