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US Patent 9562274 Method of making ultra-high strength stainless steels

Patent 9562274 was granted and assigned to Carnegie Mellon University on February, 2017 by the United States Patent and Trademark Office.

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Patent
Patent
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Patent attributes

Current Assignee
Carnegie Mellon University
Carnegie Mellon University
1
Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
1
Patent Number
95622741
Patent Inventor Names
Warren M. Garrison, Jr.1
Date of Patent
February 7, 2017
1
Patent Application Number
132265141
Date Filed
September 7, 2011
1
Patent Citations Received
‌
US Patent 12064681 Ice skate blade
2
Patent Primary Examiner
‌
Jessee Roe
1
Patent 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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