| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a high hardness (Hv ≥700) martensitic stainless steel having corrosion resistance more excellent than that of SUS440A, SUS440B and SUS440C, and also having strength equal to or above that of SUS440A, SUS440B and SUS440C. <P>SOLUTION: The martensitic stainless steel is obtained by heating a steel having components composed of, by weight, C in the range of 0.26 to 0.40%, Si in the range of ≤1%, Mn in the range of ≤1%, P in the range of ≤0.04%, S in the range of ≤0.03%, Cr in the range of 12 to 14%, N in the range of ≤0.02% and B in the range of 0.0005 to 0.002%, and the balance Fe with inevitable impurities in a nitrogen atmosphere so as to control the concentration of nitrogen in the surface layer to 0.25 to 0.3%, and thereafter performing water quenching. <P>COPYRIGHT: (C)2010,JPO&INPIT |
