镀锌钢板和部件以及它们的制造方法
By adjusting the composition and structure of the base steel sheet of the galvanized steel sheet, and combining it with a specific heat treatment process, the problem of excellent formability of high-strength galvanized steel sheet in forming complex-shaped parts has been solved. This has resulted in excellent ductility, hole expansion, local ductility and dimensional accuracy, making it suitable for complex-shaped automotive parts and impact energy absorption components.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- JFE STEEL CORP
- Filing Date
- 2022-03-18
- Publication Date
- 2026-07-17
AI Technical Summary
Existing technologies struggle to simultaneously ensure high strength while maintaining excellent formability of galvanized steel sheets in forming complex-shaped components, including ductility, hole expansion, local ductility, work hardening capacity, and dimensional accuracy during component forming.
By adjusting the composition and microstructure of the base steel plate of the galvanized steel sheet, ensuring the appropriate proportions of ferrite, bainitic ferrite, tempered martensite, retained austenite, and fresh martensite, and controlling the carbon equivalent and the content of other elements, combined with appropriate heat treatment processes such as hot rolling, cold rolling, annealing, and galvanizing, a specific steel microstructure is formed.
It achieves excellent formability of galvanized steel sheet under high strength (above 590MPa and less than 980MPa), including excellent ductility, hole expansion, local ductility, work hardening ability and dimensional accuracy during component forming, and is suitable for complex-shaped automotive parts and impact energy absorption components.
Smart Images
Figure CN117716059B_ABST