Heat resistant titanium alloy sheet excellent in cold workability and a method of production of the same

Abstract

The present invention provides a heat resistant titanium alloy sheet excellent in cold workability having high temperature strength characteristics better than JIS Type 2 pure titanium and having a cold workability and high temperature oxidation resistance equal to or better than that of JIS Class 2 pure titanium and a method of production of the same, that is, a heat resistant titanium alloy sheet excellent in cold workability characterized by comprising, by mass %, 0.3 to 1.8% of Cu, 0.18% or less of oxygen, 0.30% or less of Fe, and, as needed, at least one of Sn, Zr, Mo, Nb, and Cr in a total of 0.3 to 1.5%, and the balance of Ti and less than 0.3% of impurity elements and, further, a method of production of that titanium alloy sheet characterized by performing the final annealing at 650 to 830° C. in temperature range or performing the hot-rolled sheet or coil annealing or intermediate annealing at 650 to 830° C. in temperature range and perform the final annealing after cold working at 600 to 650° C. in temperature.

1 . A heat resistant thin-gauge titanium alloy sheet excellent in cold workability and high temperature strength characterized by consisting essentially of, by mass %, 0.3 to 1.8% of Cu, 0.18% or less of oxygen, 0.05% to 0.30% of Fe, at least one of Sn, Zr, Mo, Nb, and Cr in a total of 0.3% to 1.5%, and the balance of Ti and less than 0.3% of impurity elements, said titanium alloy sheet comprising an α phase and optionally a Ti 2 Cu phase as an unavoidable phase. 
     
     
         2 - 4 . (canceled) 
     
     
         5 . An exhaust system member, comprising the heat resistant thin-gauge titanium alloy sheet of  claim 1 . 
     
     
         6 . The exhaust system member of  claim 5 , wherein said exhaust system member is selected from the group consisting of exhaust pipe, exhaust manifold, and muffler. 
     
     
         7 . The exhaust system member of  claim 5 , wherein said exhaust system member is an automobile exhaust system member. 
     
     
         8 . The exhaust system member of  claim 5 , wherein said exhaust system member is a ship exhaust system member.