Through analyzing the production practice of thickness 8mm low-temperature tolerant plates at-45℃in 4 300 mm heavy plate production line in Laiwu Steel, the design of optimum process parameters was optimized and confirmed. The process parameters were designed as follows:C 0.12%~0.15%, Mn is about 1.25%, Nb, Ti is 0.015%, P and S elements and other impurities is as low as possible;the discharging temperature of slabs was 1 200~1 240℃, their temperature difference was controlled within 20℃. The thickness of intermediate slabs was 48 mm;the start rolling temperature in the finishing rolling period was about 1 050℃, with 7 passes in finishing period, and the finishing temperature was controlled at 830 ℃. The stable batch supplying of this product was realized.%对8 mm厚度-45℃耐低温冲击钢板在莱钢4300 mm宽厚板生产线的生产实践进行分析，优选并确定了最佳生产工艺参数，C 0.12%～0.15%，Mn 1.25%左右，Nb、Ti 0.015%，P、S元素和其他杂质尽可能低；铸坯出炉温度1200～1240℃，温差20℃内；中间坯厚度48 mm左右；精轧开轧温度稳定在1050℃左右，精轧7道次，终轧温度控制在830℃左右。
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