Abstract: For a purpose of providing a high strength and toughness stainless steel strip having not only a high strength of at least 1800 N/mm.sup.2 but also a high Erichsen break stress, which is a measure of toughness of a thin sheet, of as high as at least 1000 N/mm.sup.2, there is provided a stainless steel strip consists essentially of in mass % C: up to 0.1%, (exclusive of 0%); Si more than 1.0% and not more than 4.0%; Mn: up to 5.0% (exclusive of 0%); Ni: from 4.0 to 10.0%; Cr :from 12.0 to 18.0%; Cu :up to 5.0% (inclusive of 0%); Mo: from 1.0 to 5.0%; N: up to (exclusive of 0%); the balance being Fe and impurities with the proviso of C+N.gtoreq.0.1%, and wherein the alloying elements are adjusted so that a value of Md(N) defined by the following equation:Md(N)=580-520.times.[% C]-2.times.[% Si]-16.times.[% Mn]-16.times.[% Cr]-23.times.[% Ni]-26.times.[% Cu]-10.times.

Abstract: A martensitic precipitation-hardenable stainless steel essentially consisting of, in weight percent, not more than 0.08% C, 0.5-4.0% Si, not more than 4.0% Mn, 5.0-9.0% Ni, 10.0-17.0% Cr, more than 0.3% and up to 2.5% Mo, 0.15-1.0% Ti, not more than 1.0% Al and not more than 0.03% N and the balance being Fe, and inevitable incidental impurities, which may contain 0.3-2.5% Cu is disclosed. This steel has low hardness before aging and exhibits high strength and good toughness after aging.

Abstract: There is disclosed a high strength stainless steel consisting essentially of not more than 0.10% C., more than 1.5% and not more than 2.95% Si, less than 0.5% Mn, not less than 4.0% and not more than 8.0% Ni, not less than 12.0% and not more than 18.0% Cr, not less than 0.5% and not more than 3.5% Cu, not more than 0.15% N and not more than 0.004% S, wherein the total content of C and N is not less than 0.10%, the balance is Fe and incidental impurities, said steel satisfies the relations A'>42, and 35<Md(N)<95, wherein A'=17.times.(C % / Ti %)+0.70.times.(Mn %)+1 x-(Ni %)+0.60.times.(Cr %)+0.76 (Cu %)-0.063.times.(Al %) and Md(N)=580-520 (C %)-2 (Si %)-16 (Mn %)-16 (Cr %)-23 (Ni %)-300 (N %)-26 (Cu %). This steel is inexpensive and can be provided with high strength and high ductility by cold working and aging.

Abstract: A slicing saw blade comprising a substrate disc and a blade edge consisting essentially of a ultra-hard material deposited along a peripheral edge of said substrate disc, said substrate disc being made of a steel consisting essentially of, by weight, not more than 0.10% of C, more than 1.0% but not more than 3.0% of Si, less than 0.5% of Mn, from 4.0% to 8.0% of Ni, from 12.0% of 18.0% of Cr, from 0.5% to 3.5% of Cu, not more than 0.15% of N and not more than 0.004% of S, the sum of C and N being at least 0.10%, the balance being Fe and inavoidable impurities. The saw blade is useful for the production of wafers of a semiconductive material, and has a long service life.

Abstract: Precipitation hardening type stainless steel comprising in % by weight, 0.03<C.ltoreq.0.08, 0.3.ltoreq.Si.ltoreq.2.5, Mn.ltoreq.4.0, 5.0.ltoreq.Ni.ltoreq.9.0, 12.0.ltoreq.Cr.ltoreq.17.0, 0.1.ltoreq.Cu.ltoreq.2.5, 0.2.ltoreq.Ti.ltoreq.1.0, and Al.ltoreq.1.0, the balance being Fe and impurities, the elements being further adjusted so thatA'=17.times.(C/Ti)+0.70.times.(Mn)+1.times.(Ni)+0.60.times.(Cr)+0.76.times. (Cu)-0.63.times.(Al)+20.871is less than 42.0, ##EQU1## is not more than 2.7, and.DELTA.Hv=205.times.[Ti-3.times.(C+N)]+205.times.[Al-2.times.(N)]+57.5.time s.(Si)+20.5.times.(Cu)+20is 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.