The low carbon steel products with thickness of 2.0 mm and below produced in the short process of con-tinuous casting and rolling are in great demand in the market.However,due to the factors such as rolling process and equipment capacity,the microstructure uniformity is poor,which further affects the product performance.The causes of the uneven microstructure of low carbon steel produced by ferritic rolling process are analyzed.It is found that the uneven microstructure of strip steel gradually increases with the thickness thinning.The strip steel with a thickness of 1.8 mm has uniform microstructure,but the uneven microstructure begins to appear from 1.5 mm,and the microstructure is obviously stratified when the thickness is reduced to 1.3 mm.When the thickness is reduced to 1.1 mm,the stratification gradually intensifies,showing a clear"sandwich"structure.The coiling temperature is in-creased from 650 ℃ to 680 ℃ by adopting the air cooling mode in the layer cooling section and putting in the insula-tion cover equipment.There is also a reduction in the thickness of the intermediate billet,the use of 70％-85％of the reduction rate and other measures,so that the uniformity of the organization has been significantly improved,compared with the previous performance,the yield is reduced by 3％-5％,the tensile strength is reduced by less than 3％,and the elongation is increased by 12％-29％.
关键词
保温罩/连铸连轧/组织/卷取温度/低碳钢
Key words
insulation cover/casting and continuous casting/microstructure/coiling temperature/mild steel
维普
万方数据