The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 22, 1994
Filed:
Jun. 04, 1992
Hitachi Metals, Ltd., all of, JP;
Society of Japanese Aerospace Companies, Inc., all of, JP;
Sumitomo Precision Products Co., Ltd., all of, JP;
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.degree. to 1150.degree. C.; quenching the steel; subjecting the steel to a sub zero treatment at a temperature of -50 to -100.degree. C.; and subjecting the steel to a tempering at a temperature of 120.degree. to 450.degree. C.