The precipitation hardening die rustless steel null which is superior in high-temperature processability, heat treatment Characteristic and

摘要

PURPOSE:To improve the cold workability and age hardenability by adding prescribed percentages of C, Si, Mn, Cu, Ni, Cr, N, Nb, S and Mo. CONSTITUTION:This precipitation hardening stainless steel consists of, by weight, =0.03% C, =0.5% Si, =1% Mn, 2.5-4.5% Cu, 4-6.5% Ni, 14.5-17% Cr, =0.03% N, 0.1-0.35% Nb, =0.03% S and the balance Fe or further contains 0.15-1.5% Mo. The amounts of C, N, Nb and Ni among said components are restricted so that numerical expressions C+N=0.045%, Nb/(C+N)=5.5 and 4=Ni+27(C+N)-3.5Nb=6.5 are satisfied.