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为了提高汽车车身的防锈性能,通常是采用如镀锌板等表面处理钢板。但是这类钢板制成的部件在电焊加工时焊接部位常产生气泡,致使焊接质量难以保证。为此,日本神户制钢公司科技人员根据用户的要求,研制开发了一种高强度高耐蚀性的540 MPa级热轧钢板,从提高钢材自身的耐蚀性出发,很好地解决了原用表面处理钢板所带来的各种问题,取得了明显的效果。该钢板的化学成分(wt％)为:C-0.03、Si-0.02、Mn-1.45、P-0.080、S-0.001、Nb-0.022、Cu-0.30,余为Fe及某些不可避免的杂质。为了提高钢板的耐蚀性能,其中增加了P、Cu元素。该钢板的力学性能测试结果为;抗拉强度560 MPa,屈服强度
In order to improve the anti-rust performance of automobile body, it is usually to use surface treatment steel plate such as galvanized plate. However, the parts made of such steel plate often produce bubbles in the welding part during the welding process, which makes the welding quality difficult to guarantee. To this end, Kobe Steel Science and Technology Company in Japan based on user requirements, developed a high strength and high corrosion resistance of 540 MPa-class hot-rolled steel, corrosion from the steel to improve their own starting, a good solution to the original With the surface treatment of steel brought about by the various problems and achieved significant results. The chemical composition (wt%) of the steel sheet is C-0.03, Si-0.02, Mn-1.45, P-0.080, S-0.001, Nb-0.022 and Cu-0.30, with the remainder being Fe and some unavoidable impurities. In order to improve the corrosion resistance of steel, which increased P, Cu elements. The mechanical properties of the steel test results; tensile strength of 560 MPa, yield strength