High-hole-expansion-rate and ultrahigh-plasticity steel and manufacturing method therefor

Abstract

The present invention provides a steel with high hole expansion rate and ultrahigh plasticity and a manufacturing method therefor. The steel comprises the following components in percentage by weight: C: 0.10~0.35%, Si: 0.8~2.0%, Mn: 1.0~2.5%, P≤0.02%, S≤0.005%, Al: 0.01~0.1%, N≤0.005%, V: 0.10~0.50%, O≤0.003%, with the balance being Fe and other inevitable impurities. The steel of the present invention has excellent mechanical properties, exhibits a good matching among yield strength, tensile strength, elongation and hole expansion rate, and can be widely applied to components with complex shape requirements, or other parts that require thinning while maintaining high strength, such as those in commercial or passenger vehicles.

Dependencies are inferred from the claim text.