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US Patent 11555231 Duplex stainless steel

Patent 11555231 was granted and assigned to Outokumpu on January, 2023 by the United States Patent and Trademark Office.

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Patent attributes

Current Assignee
Outokumpu
Outokumpu
Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
Patent Number
11555231
Date of Patent
January 17, 2023
Patent Application Number
14342865
Date Filed
September 5, 2012
Patent Primary Examiner
‌
Jophy S. Koshy
CPC Code
‌
C22C 38/04

The invention relates a duplex ferritic austenitic stainless steel having high formability utilizing the TRIP effect and high corrosion resistance with the balanced pitting resistance equivalent. The duplex stainless steel contains less than 0.04 weight % carbon, less than 0.7 weight % silicon, less than 2.5 weight % manganese, 18.5-22.5 weight % chromium, 0.8-4.5 weight % nickel, 0.6-1.4 weight % molybdenum, less than 1 weight % copper, 0.10-0.24 weight % nitrogen, the rest being iron and inevitable impurities occurring in stainless steels.

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