湘钢用20CrMnTiH大方坯（300mm×430mm）生产轧材时出现较为严重的锭型偏析,对圆钢的性能不利。通过连铸调整工艺,适当提高比水量（由0.27L/kg提到0.35L/kg）,和降低结晶器电磁搅拌强度（由400A降到200A和0）,轧材质量得到改善。对比调整前后工况,发现电磁搅拌减小时连铸坯等轴晶比例降低,无电磁搅拌时连铸坯碳偏析形式较有电磁搅拌的相差大,且其轧材没出现锭型偏析,轧材的碳偏析和硬度分布也趋向均匀。
The 20CrMnTiH rolled bars produced from cast bloom（300 mm×430 mm） occurred serious pattern segregation in Xiangtan Steel, which was bad for the finished product quality. By the properly adjusting the casting operation techniques, the quality of rolled bars was improved. After casting system was adjusted such as increasing the water flow rate （from 0.27 L/kg to 0.35 L/kg） and decreasing the strength of mold magnetic stirring （from 400 A to 200 A and 0）, the rate of exquiaxed zone decreases with the reducing of stirring strength and the carbon segregation patterns of cast blooms are different whether the magnetic stirring was on or off. The pattern segregation of rolled bar disappeared when the magnetic stirring was off, and the distribution of carbon content and hardness of rolled bar was the most homogeneous and the quality was improved.
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