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采用凹型双层底板是提高沸腾钢锭成坯率的有效措施之一。通过凸底锭Fx7.3吨敞口模(铸后每锭加入6公斤硅铁粉进行化学封顶,按4％切头)与现行平底锭Fx7.1吨瓶口模(按2％切头)同炉对比试验,两种锭轧成290×300毫米的钢坯,尾部鱼尾缺陷的深度由平底锭的300毫米降到凸底锭的160毫米,钢锭成坯率提高0.86％,如果凸底锭也采用瓶口模,钢锭成材率还可再提高1.3％(凸底锭比平底锭多切头1.3％)。同时对凹型双层底板工艺操作、吊车作业率、脱模机扬程问题和初轧设备适应情况进行了标定与观察。
The use of concave double floor is one of the effective measures to improve the billet ingot formation rate. Through the underfloor Fx7.3 tons of open die (cast after each ingot by adding 6 kilograms of ferrosilicon chemical capping, according to 4% cut head) and the current flat-bottomed Fx7.1 tons bottle die (2% cut head) In the same furnace test, two kinds of billets were rolled into 290 × 300 mm billets. The depth of the tail tail defects was reduced from 300 mm in the flat bottoms to 160 mm in the under-raised billets. The ingot billet yield increased by 0.86% Also using bottle die, ingot yield can be further increased by 1.3% (convex bottom ingot than the multi-cutting head 1.3%). At the same time, the operation and process of the concave double-bottom floor, the operation rate of the crane, the lift of the stripper and the adaptation of the first rolling equipment were calibrated and observed.