| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for producing steel material for a die, composed of martensitic stainless steel and excellent in toughness. <P>SOLUTION: The method for producing steel material for a die is provided in which a martensitic stainless steel raw material having component composition containing by mass%, 0.3-0.5% C and 12.0 to 16.0% Cr, is hot-worked and successively, the hot-worked stainless steel raw material is annealed, wherein the hot working is carried out in such a manner that: the working ratio calculated using an expression of [(the thickness of the stainless steel raw material before hot working - the thickness of the stainless steel raw material after hot-working)/the thickness of the stainless steel raw material before subjected to the hot working]×100, is ≥55%; and the hot-worked stainless steel raw material is cooled to the temperature of the Ms point or lower and then successively, the stainless steel raw material is heated to the annealing temperature and subjected to the above annealing. In another embodiment, a method for producing steel material for a die is provided in which after the stainless steel raw material is annealed, the stainless steel raw material is hardened and tempered, and thus pre-hardened steel material is obtained. <P>COPYRIGHT: (C)2013,JPO&INPIT |
