| 摘要 |
PURPOSE:To improve ductility of a two-phase stainless steel and to provide stably an optional shape by heating, rolling down and reheating a two-phase stainless steel consisting essentially of Fe, Cr and Ni under specific conditions and deforming the stainless steel. CONSTITUTION:A two-phase stainless steel exhibiting two phases of a ferrite phase and an austenite phase at about ordinary temp. and consisting essentially of Fe, Cr and Ni is heated to >=1,000 deg.C to relieve working strain and to solutionize the intermetallic compd. in the matrix and thereafter the stainless steel is worked at >=30% reduction ratio in a temp. region of >=700 deg.C. The steel is thereafter reheated to a temp. region of 700 deg.C-(temp. at which the single phase of ferrite is formed -200 deg.C) and is deformed at a straining rate of 1X10<-4>/sec- 1X10<-1>/sec. An intricate shape is thus simply and easily provided to the stainless steel by plastic work alone, by which the yield is improved and the cost is reduced. |
