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在连铸机上如何生产质量要求严格的20管钢,是连铸技术上的一大难题。本文根据铸坯缺陷的形态及部位,分析其产生原因。进而采取缩短二冷区上部辊距,稳定拉速,降低浇注温度,严格防止铸坯在二冷区内的表面温度回升,同时配以具有双层结构的结晶器用保护渣及四孔伸入式水口等措施后,浇注出了符合制管要求的20钢铸坯。经过一百多炉试验,收到了显著而稳定的效果。铸坯的原始合格率达到98％以上,圆管坯成坯率较常规生产提高5.6％,管坯成本降低24％,成材率达到或超过用钢锭轧制的管材。
How to produce 20-pipe steel with strict quality requirements in the continuous casting machine is a major technical problem in continuous casting. This article according to the shape and location of slab defects, analysis of its causes. And then take to reduce the upper part of the second cooling zone roller spacing, the rate of steady speed and reduce the pouring temperature, strictly prevent the slab in the second cooling zone surface temperature rise, accompanied by a double structure with mold flux and four holes into the After the nozzle and other measures, pouring out of line with the requirements of the 20 steel slab. After more than a hundred furnace tests, received significant and stable results. The original pass rate of the billet reached more than 98%. The billet percentage of the round tube increased by 5.6% compared with the conventional production, the cost of the billet decreased by 24%, and the finished rate reached or exceeded the tube rolled by the steel ingot.