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 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 a method of production characterized by performing the final annealing at 650 to 830° C. or performing the hot-rolled sheet or coil annealing or intermediate annealing at 650 to 830° C. and the final annealing after cold working at 600 to 650° C.

1 - 4 . (canceled) 
     
     
         5 . A heat resistant thin gauge, cold rolled titanium alloy sheet used in an exhaust system excellent in cold workability and high temperature strength characterized by consisting of, by mass %, 0.3 to 1.8% of Cu, 0.18% or less of oxygen, 0.05% or more to 0.30% of Fe, and the balance of Ti and less than 0.3% of impurity elements, said titanium alloy steel consisting essentially of an α phase, said titanium alloy sheet having a room temperature elongation of at least 35%.