The research contents are included as follows: metallurgical effect of electromagnetic stirring; inclusion, macrograph, segregation of composition; properties of final rolled steel products.
其内容包括：电磁搅拌的冶金效果、铸坯的低倍组织、非金属夹杂物、成分偏析及钢材性能。
The results show that main cause of conchoidal fracture forming is that composition segregation in solidification grain boundary of casting steel reduces the resistance of crack propagation.
结果表明，沿一次晶晶界的成分偏析对裂纹扩展阻力的降低作用是铸钢中贝壳状断口形成的主要原因。
Results of the composition analysis reveal that the primary cause to the fracture is the composition segregation of the wire .
成分分析结果表明，心部薄弱环节主要起因于线材中心的成分偏析。
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