Patent · US Active

Ferritic-austenitic stainless steel

US9856551B2 · kind B2 · utility

3Cited by

5References

23Claims

0Family size

Assignee

OUTOKUMPU STAINLESS AKTIEBOLAG · SE

Inventors

Elisabeth Alfonsson · Avesta, SE
Jun Wang · Fort Washington, US
Mats Liljas · Avesta, SE
Per Olof Johansson

Key dates

Filing date	May 29, 2015
Grant date	Jan 2, 2018
Priority date	—
Expiry date	Aug 19, 2035

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC21D2211/005
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

A ferritic-austenitic stainless steel having a microstructure containing 35-65 vol-% ferrite and 35-65 vol-% austenite has a chemical composition which contains in weight-%: 0.005-0.07 C, 0.1-2.0 Si, 3-8 Mn, 19-23 Cr, 0.5-1.7 Ni, optionally Mo and/or W in a total amount of max 1.0 (Mo+W/2), optionally Cu up to max 1.0 Cu, 0.15-0.30 N, balance iron and impurities. The following conditions apply for the chromium and nickel equivalents: 20<Creq<24.5, 10<Nieq, where Creq=Cr+1.5 Si+Mo+2 Ti+0.5 Nb, and Nieq=Ni+0.5 Mn+30 (C+N)+0.5 (Cu+Co).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.