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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.:

US 11566309 B1

PDFFull Text
Date of Patent:
Jan. 31, 2023

Filed:

Jun. 12, 2014

Duplex ferritic austenitic stainless steel

Applicant:

Outokumpu Oyj, Espoo, FI;

Inventors:

James Oliver, Fjärdhundra, SE;

Erik Schedin, Uppsala, SE;

Rachel Pettersson, Norrtälje, SE;

Assignee:

Outokumpu Oyj, Helsinki, FI;

Attorney:

Quinn IP Law

Primary Examiner:

Jophy S Koshy

Int. Cl.
CPC ...
C22C 38/58 (2006.01); C22C 38/42 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/54 (2006.01); C21D 6/00 (2006.01); C22C 38/40 (2006.01); C22C 38/44 (2006.01); C21D 9/00 (2006.01);
U.S. Cl.
CPC ...
C22C 38/58 (2013.01); C21D 6/002 (2013.01); C22C 38/001 (2013.01); C22C 38/005 (2013.01); C22C 38/02 (2013.01); C22C 38/40 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/54 (2013.01); C21D 9/0081 (2013.01); C21D 2211/001 (2013.01); C21D 2211/005 (2013.01);
Abstract

Disclosed is a duplex ferritic austenitic stainless steel of 40-60 volume % ferrite and 40-60 volume % austenite, with improved cold workability and impact toughness. It contains less than 0.07% carbon (C), 0.1-2.0% silicon (Si), 3-5% manganese (Mn), 19-23% chromium (Cr), 1.1-1.9% nickel (Ni), 1.1-3.5% copper (Cu), 0.18-0.30% nitrogen (N), optionally molybdenum (Mo) and/or tungsten (W) according to the formula (Mo+½W)<1.0%. It optionally contains 0.001-0.005% boron (B), up to 0.03% of each of cerium (Ce) and/or calcium (Ca), with the balance being iron (Fe) and impurities where the chromium equivalent (Cr) and the nickel equivalent (Ni): 20<Cr<24.5 and Ni>10, where Cr=Cr+1.5Si+Mo+2Ti+0.5Nb Ni=Ni+0.5Mn+30(C+N)+0.5(Cu+Co).

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