Production manner null of the high carbon content martensite type rustless steel which is superior in bombardment

摘要

PURPOSE:To impart excellent impact toughness by hot rolling high-carbon content martensitic stainless steel at a specific cumulative draft and holding the steel at a specific temp., then cooling the same. CONSTITUTION:The high-carbon content martensitic stainless steel contg. 10.0 to 20.0wt.% C and 0.5 to 1.5% C is subjected to hot rolling at the cumulative draft exceeding 50%. The stainless steel is held at =780 deg.C for =30 minutes and is then cooled. Or the hot rolling is ended at =950 deg.C, is held at =780 deg.C for =20 minutes and is cooled. The high-carbon content martensitic stainless steel which is sufficiently softened after spheroidization annealing and has the excellent impact toughness is obtd. in this way. The sheet rupture at the time of trimming and the edge crack at the time of cold rolling in case of a sheet material are decreased by this stainless steel and the disconnection during handling and drawing is decreased in case of bar and wire materials.