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本文对30CrMnSiNi2A电渣钢锭纵向裂纹的产生原因及解决措施等有关问题进行了研究,并在工业生产中得到了验证。结果表明:纵向裂纹是由于C,P,S,Si等元素向原始奥氏体晶界富集,在较大的热应力作用下,沿着这种弱化了的晶界开裂而形成的。Al的有害作用并非是形成AlN,而是促进元素显微偏析,使晶界变脆。为了确保30CrMnSiNi2A电渣钢锭不裂,在钢锭脱锭后的保温条件受到限制的情况下,控制钢中的残余Al含量是行之有效的措施之一。
In this paper, the cause of longitudinal cracks in 30CrMnSiNi2A electroslag ingot and the measures to be taken to solve the problems were studied and verified in industrial production. The results show that the longitudinal cracks are due to the enrichment of C, P, S, Si and other elements into the original austenite grain boundaries, and they are formed along the weakened grain boundaries under the effect of large thermal stress. The detrimental effect of Al is not to form AlN but to promote elemental microsegregation to make the grain boundaries brittle. In order to ensure that the 30CrMnSiNi2A electroslag ingot is not cracked, it is one of the effective measures to control the residual Al content in the steel under the condition of limited heat preservation after ingot ingoting.