对首秦2号板坯连铸机轻压下工艺进行了细致的研究。通过连铸坯射钉试验对首秦2号连铸机二级冷却模型进行了校验；通过不同轻压下率试验条件下连铸坯中心偏析的程度确定了合理的、能够有效改善连铸坯中心偏析的轻压下率；通过连铸坯厚度方向不同部位碳硫元素的分析对轻压下工艺改善前后连铸坯中心偏析度进行了对比。结果表明：首秦2号连铸机二级冷却模型能够准确反映连铸坯凝固末端的位置。在拉速为0.70m/min的连铸工艺条件下，320mm厚连铸坯轻压下段为第9和第10段，合理的轻压下率应该保持在0.85～1.0mm/m之间。采用合理的轻压下工艺后，连铸坯中心偏析得到了明显改善，满足了首秦高品质中厚板对连铸坯内部质量的严格要求。
Soft reduction on the No.2 continuous caster in Shouqin was investigated by pin shooting experiment to verify the Level 2 secondary cooling model. On the basis of this experimental result, optimized soft reduction parameters were determined by industrial trials with different soft reduction rate and center segregation degree was determined by quantitative analysis of carbon and sulfur content at different position in thickness direction of slabs. The results show that the Level 2 secondary cooling model of the No.2 caster can predict the crater end position accurately. The optimal soft reduction rate for 320mm thick slabs is 0.85-1.0mm/m applied on the 9th and 10th segment at a casting speed of 0.70m/min. After optimization of the soft reduction, the centerline quality of slabs is improved remarkably, which meets the stringent requirement on slab internal quality of high quality heavy plates in Shouqin.
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