热轧宽幅薄规格深冲搪瓷钢的开发

Development of hot rolled wide and thin gauge deep-drawing enamel steel

随着用户对搪瓷钢成形效率、加工成材率要求的进一步提高,对宽幅薄规格深冲搪瓷钢的需求日益增多,而采用传统热轧技术生产时存在氧化铁皮压入、甩尾、浪形、成形性能差等技术瓶颈,因此基于薄板坯连铸连轧产线开发了热轧酸洗宽幅薄规格深冲搪瓷钢。介绍了深冲搪瓷钢的化学成分设计、生产工艺、带钢表面质量和力学性能稳定性控制工艺。研究及生产实践表明:成品力学性能均匀,具有优异的成形性能、抗鳞爆性能和密着性能;带钢的屈服强度直接影响其深冲性能,钢中有效Ti含量、精轧压下分配和终轧温度会显著影响带钢的屈服强度,卷取温度对带钢屈服强度影响较小;深冲搪瓷钢的主要强化机理为固溶强化和细晶强化,析出强化作用较弱。基于薄板坯连铸连轧产线热轧酸洗宽幅薄规格深冲搪瓷钢的成功开发,实现了1.65 mm×1500 mm极限规格深冲搪瓷钢批量稳定供货超万吨,填补了市场空白。

With the further improvement of forming efficiency and processing yield of enamel steel,the demand for wide and thin gauge deep-drawing enamel steel increases day by day.However,there are technical bottlenecks such as scale penetration,tail swing,wave shape and poor forming performance when using traditional hot rolling technology.Therefore,hot rolling pickling wide and thin gauge deep-drawing enamel steel is developed based on thin slab continuous casting and rolling line.The chemical composition design,production process,strip surface quality and mechanical property stability control process of deep-drawing enamel steel are introduced.The research and production practice show that the mechanical properties of finished products are uniform,and they have excellent formability,fish scale resistance and adhesion properties.The yield strength of the strip directly affects its deep drawing properties.The effective Ti content in steel,finishing rolling reduction distribution and finishing rolling temperature have significant effects on the yield strength of the strip.The coiling temperature has little effect on the yield strength of the strip.The main strengthening mechanism of deep-drawing enamel steel is solid solution strengthening and fine grain strengthening,and precipitation strengthening is weak.Based on the successful development of hot rolled pickling wide and thin gauge deep-drawing enamel steel in thin slab continuous casting and rolling line,the stable batch supply of 1.65 mm×1500 mm extreme gauge deep-drawing enamel steel exceeds ten thousand tons,filling the market gap.