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鄂钢板坯连铸—中厚板轧制生产线投产初期,钢板边裂比例月均高达6.34%,造成钢板切边量大并产生3.58%的非计划宽度钢板,经生产试验及数据统计分析:认为二冷水设计不合理、拉速波动造成矫直温度过低是导致铸坯产生角裂的主要原因,在轧制展宽过程中,铸坯的角部裂纹向钢板宽面延伸。采取以钢种成分设计铸坯矫直温度,根据铸机二冷水分布特点优化坯料设计,控制轧制宽展比等措施,钢板边裂比例降至0.7%以内,由此产生的非计划宽度钢板控制在0.4%以下。
In the early stage of the production of the slab continuous casting and medium plate rolling production line of E steel, the ratio of side splits of steel plates was as high as 6.34% per month, resulting in large amount of steel plate trimming and 3.58% unplanned width steel plate. After production test and data statistical analysis, Second, the design of unreasonable cold water, pull speed fluctuations caused by straightening temperature is the main reason leading to the corner crack occurred in the slab, roll broadening process, the slab corner crack extending to the wide plate. The straightening temperature of slab was designed according to the composition of steel, the blank design was optimized according to the distribution characteristics of secondary cooling water in the casting machine, and the ratio of width to width of rolling was controlled. The proportion of edge splitting of steel slab decreased to 0.7%, and the unplanned width steel Control at 0.4% or less.