PRODUCTION OF HIGH STRENGTH MARTENSITIC STAINLESS STEEL EXCELLENT IN RUSTING RESISTANCE AND COLD FORMED PRODUCT

摘要

PURPOSE: To produce a high strength martensitic stainless steel excellent in rusting resistance for cold formed products such as a drilling tapping screw excellent in screwing properties and rusting resistance and a high strength spring excellent in blanking properties and rusting resistance. ;CONSTITUTION: This steel excellent in rusting resistance consists of a compsn. contg., by weight, 0.13 to 0.20% C, 0.1 to 1.0% Si, 2.0 to 6.0% Mn, 11.0 to 16.0% Cr, 1.3 to 3.5% Mo, 0.001 to 0.1% Al and 0.06 to 0.13% N, contg., at need, 0.001 to 0.010% B and/or 0.05 to 1.0% Ti and 0.05 to 1.% Nb, and in which the value of the index of rusting resistance ARI is regulated to 17 to 21 (%) and the value of the index of ferrite content DI and the index of martensite content MI are regulated to 0 (%), and the balance substantial Fe with inevitable impurities.;COPYRIGHT: (C)1995,JPO