Metal treatment – Stock – Ferrous
Patent
1993-07-20
1994-10-25
Dean, Richard O.
Metal treatment
Stock
Ferrous
148326, 148605, 148607, 420 37, 420 38, C22C 3852
Patent
active
053585771
ABSTRACT:
A high strength, high toughness stainless steel consisting, by weight, of C more than 0.16% but less than 0.25%, Si not more than 2.0%, Mn not more than 1.0%, Ni not more than 2.0%, Cr from 11 to 15%, Mo not less than 0.5% but less than 3.0%, Co from 12 to 21%, at least one kind selected from the group consisting of V from 0.1 to 0.5% and Nb less than 0.1% which at least one kind is added as occasion demands, and the balance Fe and incidental impurities. This steel is produced by a method comprising the steps of: preparing a stainless steel having the composition of any one of the claims 1 to 4; subjecting the stainless steel to a solution heat treatment at a temperature of 950 to 1150.degree. C.; quenching the steel; subjecting the steel to a sub zero treatment at a temperature of -50.degree. to -100.degree. C.; and subjecting the steel to a tempering at a temperature of 120.degree. to 450.degree. C.
Nakama Nobuhito
Uehara Toshihiro
Watanabe Rikizo
Dean Richard O.
Hitachi Metals Ltd.
Ip Sikyin
Sumitomo Precision Products Co. Ltd.
The Society of Japanese Aerospace Companies, Inc.
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