一种高成形高表面质量汽车用钢及其生产方法
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ANGANG STEEL CO LTD
- Filing Date
- 2026-03-20
- Publication Date
- 2026-07-17
AI Technical Summary
While existing automotive steels meet the requirements of high formability and high surface quality, they also suffer from problems such as difficulty in controlling Si content, high cost, and easy appearance of iron oxide scale streaks and color difference defects on the surface.
High-formability, high-surface-quality automotive steel employs a specific chemical composition ratio, including the rational control of C, Si, Mn, Al, Nb, Cr, and Ce. Combined with smelting, continuous casting, hot rolling, and pickling processes, this ensures that the steel plate microstructure comprises a proportion of ferrite, martensite, and retained austenite. The oxidation activity of Al preferentially generates Al2O3 to avoid iron oxide scale, Nb and C form NbC to refine the grains, Cr improves hardenability and corrosion resistance, and Ce improves purity and weldability.
It achieves high formability and high surface quality of steel plates, with yield strength of 350-450MPa, tensile strength ≥608MPa, longitudinal elongation A50 ≥30%, and surface roughness Ra of 1.25-1.60μm. It avoids iron oxide scale streaks and color difference defects, and is low in cost and easy to smelt.
Smart Images
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