Steel Plate and its Manufacturing Method
By optimizing the alloy composition and manufacturing process, high-strength steel plates were prepared, solving the problem of poor machinability of high-strength steel plates in existing technologies and achieving a combination of high strength and good machinability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- POHANG IRON & STEEL CO LTD
- Filing Date
- 2024-12-13
- Publication Date
- 2026-07-10
AI Technical Summary
Existing technologies make it difficult to manufacture high-strength steel plates with tensile strengths of 590 MPa or higher while maintaining good machinability, and are prone to processing defects such as cracks or wrinkles during the molding process of automotive parts.
By optimizing the alloy composition system and manufacturing conditions, the steel plate contains specific weight percentages of carbon, silicon, manganese, phosphorus, aluminum, chromium and nitrogen elements, and controls the fine microstructure, including 60-80% ferrite, 10-25% bainite, 3-8% retained austenite and the balance martensite phase, and adopts specific hot rolling, cold rolling and annealing processes.
It achieves high-strength steel plates with tensile strength of over 590MPa, while also possessing low yield ratio, high ductility, excellent work hardening rate and hole expansion ability, thus avoiding the generation of processing defects.
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