Steel Sheet For Hot Press And Manufacturing Method Thereof
Patent No. EP3933061 (titled "Steel Sheet For Hot Press And Manufacturing Method Thereof") was filed by Hyundai Steel on Nov 30, 2020. The application was issued on Jul 23, 2025.
Patent Summary
A steel sheet for hot press forming comprises a base steel sheet and a plating layer consisting of a surface layer and a diffusion layer. The diffusion layer sequentially comprises an Fe-Al alloy layer and an Fe-Al intermetallic compound layer, both containing silicon. The intermetallic compound layer constitutes 84.5% to 98.0% of the diffusion layer and consists of a first and second sequentially laminated layer. Compositional ranges (wt%) are: alloy layer (Al 50-75, Fe 10-50, Si 0.1-15); intermetallic layer (Al 35-85, Fe 25-45, Si 8-30); first layer (Al 35-51, Fe 25-45, Si 15-30); and second layer (Al 55-85, Fe 10-30, Si 8-25). Hardness follows the hierarchy: alloy layer > second layer > first layer.
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Date
Description
EP3933061
- Application Number
- EP20210596A
- Filing Date
- Nov 30, 2020
- Status
- Granted And Under Opposition
- Jun 20, 2025
- Publication Date
- Jul 23, 2025
- External Links
- Slate, Register , Google Patents