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分析了包钢宽厚板出现的钢板星裂、表面横裂纹、边直裂纹等缺陷产生的原因。通过将微合金钢w(N)控制在40×10-6以下,动态调节连铸过程冷却水量以保证铸坯矫直温度保持在塑性区域范围内,合理选取连铸过程中的保护渣,提高铸坯出加热炉温度,减少轧机辊道冷却水对钢板下表面温降影响,减少上下表面温差以减轻由轧制过程中上下表面金属流动性差异造成的折叠程度等措施,钢板星裂、表面横裂纹、边直裂纹等缺陷得到了有效控制,提高了产线热装热送率及钢板的成材率。
The causes of the defects such as the steel star, the transverse crack and the straight crack appearing on the cladded steel plate are analyzed. By controlling the micro-alloyed steel w (N) under 40 × 10-6, the cooling water volume in the continuous casting process can be adjusted dynamically to keep the straightening temperature of the slab within the plastic zone. The slag in the continuous casting process can be reasonably selected and increased Slab out of the furnace temperature to reduce rolling mill roller cooling water on the lower surface temperature drop to reduce the temperature difference between the upper and lower surface to reduce the rolling process by the difference between the upper and lower metal flow caused by the degree of folding and other measures, Horizontal cracks, straight cracks and other defects have been effectively controlled and improve the rate of hot-wire production line delivery rate and sheet metal.