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目前强度级别较高的双相钢产品已经可以普遍采用热镀锌工艺生产,热镀锌双相钢在生产过程中,表面出现明显的粗糙缺陷,形成边部与中部的色差,严重影响热镀锌双相钢产品表面质量。粗糙缺陷伴随粗糙度异常升高、锌层不均、抑制层形成不良、基板表面微裂纹等现象。分析认为,基板表面微裂纹是造成热镀锌双相钢表面粗糙的主要原因。热轧态组织和冷轧压下率是决定冷硬板浅表层微裂纹形成的关键因素。通过优化卷取温度及热轧卷厚度,改善热轧态组织及降低冷轧压下率,可有效控制冷轧板表面浅表层微裂纹的形成,从而良好解决热镀锌双相钢表面粗糙问题。
At present, the dual-phase steel products with higher strength level can be generally produced by the hot-dip galvanizing process. In the production process of the hot-dip galvanized dual-phase steel, obvious rough defects appear on the surface to form the color difference between the edges and the middle part, Surface quality of zinc duplex steel products. Coarse defects accompanied by abnormally increased roughness, uneven zinc layer, inhibition of poor formation of the substrate surface micro-cracks and so on. Analysis, the substrate surface micro-cracks is caused by hot galvanized duplex steel surface roughness of the main reasons. Hot-rolled microstructure and cold rolling reduction rate is the key factor that determines the formation of micro-cracks on the surface of cold hard plate. By optimizing the coiling temperature and HRC thickness, improving the hot rolling microstructure and reducing the rolling reduction, the formation of superficial micro-cracks on the surface of cold-rolled steel sheet can be effectively controlled so that the surface roughness of hot-dip galvanized duplex steel can be well solved .