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轴承钢使用厂家在镦粗和扩孔过程中发现个别件存在开裂现象,对对应批号的棒材和钢坯倒追跟踪分析,亦发现皮下裂纹和角部裂纹。经高低倍检验分析,发现铸钢坯内碳化物偏析、硫化物聚集是导致裂纹和开裂出现的原因,并提出改进措施。
Bearing steel manufacturers in the upsetting and reaming process found that there are individual pieces of cracking phenomenon, the corresponding batch of bar and billet chase tracking analysis also found subcutaneous cracks and corner cracks. The analysis of high and low times found that the segregation of carbides in cast billet and the accumulation of sulphides are the causes of cracks and cracking, and proposed the improvement measures.