Patent · US Active

Steel sheet having excellent toughness, ductility and strength, and manufacturing method thereof

US11591665B2 · kind B2 · utility

0Cited by

2References

23Claims

0Family size

Assignee

ArcelorMittal · LI

Inventors

Coralie Jung · Racrange, FR
Astrid Perlade · Le Ban-Saint-Martin, FR
Kangying Zhu · Metz, FR
Frédéric KEGEL · Yutz, FR

Key dates

Filing date	Dec 18, 2018
Grant date	Feb 28, 2023
Priority date	—
Expiry date	Mar 6, 2039

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC21D2211/008
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

A cold-rolled and heat treated steel sheet, has a composition comprising 0.1%≤C≤0.4%, 3.5%≤Mn≤8.0%, 0.1%≤Si≤1.5%, Al≤3%, Mo≤0.5%, Cr≤1%, Nb≤0.1%, Ti≤0.1%, V≤0.2%, B≤0.004%, 0.002%≤N≤0.013%, S≤0.003%, P≤0.015%. The structure consists of, in surface fraction: between 8 and 50% of retained austenite, at most 80% of intercritical ferrite, the ferrite grains, if any, having an average size of at most 1.5 μm, and at most 1% of cementite, the cementite particles having an average size lower than 50 nm, martensite and/or bainite.

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