Patent · US Active

Ferritic-austenitic stainless steel

US9822434B2 · kind B2 · utility

1Cited by

7References

8Claims

0Family size

Assignee

Outokumpu Oyj · FI

Inventors

Peter Samuelsson · Stockholm, SE
Simon Lille · Avesta, SE
Jan Andersson · Ystad, SE
Mats Liljas · Avesta, SE
Erik Schedin · Uppsala, SE
Pelle Johansson · Avesta, SE

Key dates

Filing date	Dec 17, 2009
Grant date	Nov 21, 2017
Priority date	—
Expiry date	Dec 29, 2030

Classification

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

Abstract

The invention relates to a duplex stainless steel having austenitic-ferritic microstructure of 35-65% by volume, preferably 40-60% by volume of ferrite and having good weldability, good corrosion resistance and good hot workability. The steel contains 0.005-0.04% by weight carbon, 0.2-0.7% by weight silicon, 2.5-5% by weight manganese, 23-27% by weight chromium, 2.5-5% by weight nickel, 0.5-2.5% by weight molybdenum, 0.2-0.35% by weight nitrogen, 0.1-1.0% by weight copper, optionally less than 1% by weight tungsten, less than 0.0030% by weight one or more elements of the group containing boron and calcium, less than 0.1% by weight cerium, less than 0.04% by weight aluminium, less than 0.010% by weight sulphur and the rest iron with incidental impurities.

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