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通过研究结晶器电磁搅拌(M-EMS)对连铸坯及圆钢宏观碳偏析的影响机制,结合端淬检验标准及操作对打点位置碳含量波动分析,探讨了M-EMS对齿轮钢端淬检验值的影响。结果表明:M-EMS的使用促使皮下负偏析带形成并一定程度加剧柱状晶/等轴晶转变区域(CET区域)正偏析幅度;圆钢所传承的宏观碳偏析位置与端淬磨面位置总体交错,使得端淬检验值波动;稳定连铸工艺,适当降低中、低碳钢结晶器电磁搅拌强度,提高端淬样坯制取操作的一致性,将有利于提高端淬检验值的准确性。
By studying the influence mechanism of mold electromagnetic stirring (M-EMS) on macro-carbon segregation of continuous casting billets and round bar, combined with the end-quenching test standard and operation analysis of fluctuation of carbon content at the spotting location, Impact of test values. The results show that the use of M-EMS causes the formation of sub-negative negative segregation zone and aggravates the positive segregation amplitude of the columnar crystalline / equiaxed zone (CET area) to a certain extent. The macro carbon segregation position and the end quench surface position Staggered, making the end quenching test value fluctuations; stable continuous casting process, appropriate to reduce medium and low carbon steel mold electromagnetic stirring strength, improve the consistency of the preparation of end quenched billet, will help improve the accuracy of end quenching test values .