Patent · US Active

High toughness hot rolled and annealed steel sheet and method of manufacturing the same

US12416056B2 · kind B2 · utility

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19Claims

0Family size

Assignee

ArcelorMittal · LI

Inventors

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

Key dates

Filing date	Dec 16, 2020
Grant date	Sep 16, 2025
Priority date	—
Expiry date	Apr 12, 2042

Classification

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

Abstract

A hot rolled and annealed steel sheet having a composition including, by weight percent: C: 0.1-0.25%, Mn: 3.00-5.00%, Si: 0.80-1.60%, B: 0.0003-0.004%, S≤0.010%, P≤0.020%, N≤0.008% the remainder of the composition being iron and unavoidable impurities resulting from the smelting, and having a microstructure consisting of, in surface fraction: more than 20% of recrystallized ferrite, the balance being non-recrystallized ferrite, more than 15% of the recrystallized ferrite having grain size larger than 5 μm and a density of carbides at grain boundary of recrystallized ferrite less than 5 carbides per 10 μm of grain boundary length.

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