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 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 the balance of Ti and less than 0.3% of impurity elements.  
   
   
       2 . A heat resistant titanium alloy sheet excellent in cold workability as set forth in  claim 1 , characterized in that said titanium alloy sheet further contains at least one or more of Sn, Zr, Mo, Nb, and Cr in a total of 0.3 mass % to 1.5 mass %.  
   
   
       3 . A method of production of heat resistant titanium alloy sheet excellent in cold workability produced by the steps of remelting, hot rolling, hot-rolled sheet or coil annealing, cold rolling, intermediate annealing, final annealing, etc., said method of production of a titanium alloy sheet characterized by adjusting the ingredients at said remelting to the composition of ingredients as set forth in  claim 1  and performing said final annealing at 650 to 830° C. in temperature range.  
   
   
       4 . A method of production of heat resistant titanium alloy sheet excellent in cold workability produced by the steps of remelting, hot rolling, hot-rolled sheet or coil annealing, cold rolling, intermediate annealing, final annealing, etc., said method of production of a titanium alloy sheet characterized by adjusting the ingredients at said remelting to the composition of ingredients as set forth in  claim 1 , performing said annealing of the hot-rolled sheet annealing or said intermediate annealing at 650 to 830° C. in temperature range, and performing said final annealing at 600 to 650° C. in temperature range.