| 摘要 |
PURPOSE:To obtain a martensitic stainless steel having excellent cold forgeability by extremely reducing the contents of Si and Mn in an SUS 410 type stainless steel and regulating its crystal grain size to the specific value. CONSTITUTION:The SUS 410 type stainless steel material having the compsn. contg., by weight, 0.10-0.16% C, <0.20% Si, <0.25% Mn, <0.005% S and 11.50-12.20% Cr, or furthermore contg. one or more kinds among <1.5% Mo, <0.20% Ti, <0.15% V and <0.10% Nb and the balance consisting of Fe is heated for 2-15hr at 800-950 deg.C to regulate its crystal grain size to the range of 5-8. The martensitic stainless steel material having excellent cold forgeability in such a manner that cracks do not occur at the time of cold forging and furthermore having excellent tensile strength and corrosion resistance can be obtd. |
