Coated Steel Sheet And High Strength Press Hardened Steel Part And Method Of Manufacturing The Same
Patent No. EP4263893 (titled "Coated Steel Sheet And High Strength Press Hardened Steel Part And Method Of Manufacturing The Same") was filed by Arcelormittal on Dec 3, 2021. The application was issued on Sep 17, 2025.
Patent Summary
A coated steel sheet comprises a steel composition (wt%): C 0.15–0.25, Mn 0.5–1.8, Si 0.1–1.25, Al 0.01–0.1, Cr 0.1–1.0, Ti 0.01–0.1, B 0.001–0.004, P $\le$0.020, S $\le$0.010, N $\le$0.010, and optionally Mo $\le$0.40, Nb $\le$0.08, and Ca $\le$0.1, with iron as the remainder. The sheet structure consists of a bulk microstructure containing 60–90% ferrite (surface fraction), with the balance being martensite-austenite islands, pearlite, or bainite. The bulk is topped by a decarburized layer featuring an upper ferrite layer 1–100 $\mu$m thick, which is further topped by an aluminum or aluminum alloy coating. The steel is designed for hot forming into press-hardened parts with tensile strength $\ge$135
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Date
Description
EP4263893
- Application Number
- EP21819987A
- Filing Date
- Dec 3, 2021
- Status
- Granted And Under Opposition
- Aug 15, 2025
- Publication Date
- Sep 17, 2025
- External Links
- Slate, Register , Google Patents