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从连铸工艺包括拉速、水口浸入深度、浸入水口出口角度、保护渣性能对超低碳钢热轧卷表面线状缺陷进行深入研究并进行现场工业试验,分析了连铸工艺参数对该类缺陷的影响规律。研究结果表明:将230 mm×1 600 mm断面铸坯,拉速由1.2 m/min降低至1.1 m/min,浸入式水口插入深度由130 mm加深至145 mm,水口出口角度由15°增加到18°,均可对抑制浇铸过程液面波动及提高超低碳钢板卷表面质量起到很好的作用。将超低碳钢保护渣黏度由0.306 Pa·s提高至0.364 Pa·s,熔点由1 089℃降低至1 062℃,可使超低碳钢热轧板卷线状缺陷发生率由8.86%降低至4.49%。
From the continuous casting process, including casting speed, depth of immersion, exit angle of immersed nozzle and properties of mold flux, the paper studies the linear defects on the surface of HRC HRC and conducts on-site industrial tests. The impact of defects. The results show that the pulling speed of the slab with 230 mm × 1 600 mm section is reduced from 1.2 m / min to 1.1 m / min, the immersion nozzle depth is increased from 130 mm to 145 mm, and the exit angle of the nozzle is increased from 15 ° to 18 °, can inhibit the casting process fluctuations and improve ultra-low carbon steel coil surface quality played a good role. The viscosity of ultra-low carbon steel slag increased from 0.306 Pa · s to 0.364 Pa · s, the melting point decreased from 1 089 ℃ to 1 062 ℃, and the linear defect rate of ultra-low carbon steel hot rolled coil decreased from 8.86% To 4.49%.