Ultra-high strength stainless steels

Details Ultra-high strength stainless steels Ultra-high strength stainless steels

2008-06-18

2011-10-11

Ip, Sikyin (Department: 1735)

Metal treatment

Stock

Ferrous

C148S326000, C420S036000, C420S037000, C420S038000

Reexamination Certificate

active

08034197

ABSTRACT:
An ultra-high strength stainless steel alloy with enhanced toughness includes in % by weight: 0 to 0.06% carbon (C); 12.0 to 18% chromium (Cr); 16.5 to 31.0% cobalt (Co); 0 to 8% molybdenum (Mo); 0.5 to 5.0% nickel (Ni); 0 to 0.5% titanium (Ti); 0 to 1.0% niobium (Nb); 0 to 0.5% vanadium (V); 0 to 16% tungsten (W); balance iron (Fe) and incidental deoxidizers and impurities. The heat treating method includes the steps of austenitizing at least once followed by quenching, tempering and sub-zero cooling to obtain no more than about 6-8% retained austenite in the finished alloy.

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Asayama, Yukiteru, “Notch Toughness Characteristics of High Strength Maraging Stainless Steel”, J. Japan Inst. Metals, vol. 40, No. 5 (1976), pp. 533-541, English abstract attached.
Asayama, Yukiteru, “The Effect of Aging on the Notch Toughness of High Strength Maraging Stainless Steels”, J. Japan Inst. Metals, vol. 41, No. 10 (1977), pp. 973-981, English abstract attached.
Asayama, Yukiteru, “Study on Aging Embrittlement of High Strength Maraging Stainless Steels”, J. Japan Inst. Metals, vol. 42, No. 7 (1978), pp. 649-658, English abstract attached.

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