| 摘要 |
Precipitation hardening type stainless steel comprising in % by weight, 0.03<C</=0.08, 0.3</=Si</=2.5, Mn</=4.0, 5.0</=Ni</=9.0, 12.0</=Cr</=17.0, 0.1</=Cu</=2.5, 0.2</=Ti</=1.0, and Al</=1.0, the balance being Fe and impurities, the elements being further adjusted so that A'=17x(C/Ti)+0.70x(Mn)+1x(Ni)+0.60x(Cr)+0.76x(Cu)-0.63x(Al)+20.871 is less than 42.0, <IMAGE> is not more than 2.7, and DELTA Hv=205x[Ti-3x(C+N)]+205x[Al-2x(N)]+57.5x(Si)+20.5x(Cu)+20 is within the range between 120 and 210, said steel as solution treated and optionally slightly cold worked having a substantial martencite structure. The steel has a good mechanical workability before aging, and when age hardened, it develops improved hardness and toughness as well as an isotropic and improved spring performance. |
