Causes to the laminardefect of the umbrella bone steel occurring in the process of cold forming are analyzed by chemical analysis and microstructure analysis.
采用化学分析及微观组织分析的方法，对伞骨钢压扁后成型过程中所产生分层缺陷的原因进行分析。
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Results show that the primary cause to the laminardefect of the umbrella bone steel in the process of cold bending to U-shape is the severe carbon segregation in the steel band.