Cause Analysis of Central Cracks in SPA-H Steel
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摘要: 鞍钢生产的SPA-H钢板用户在使用过程中出现中心裂纹现象。通过化学成分分析、金相组织、扫描等方法对钢板中心裂纹原因进行分析。结果表明,钢板中心存在铁素体偏析带现象,并且偏析带内存在大量MnS夹杂物,是钢板在加工过程中产生中心裂纹的主要原因。同时,根据钢板中心裂纹产生的原因,提出了控制钢板中心裂纹的改进措施。Abstract: Central crack frequently occurred in the forming of a kind of SPA-H steel sheet.The cause for central crack had been investigated by analysis of the chemical composition, metallurgical structure and EDS.It is found out that ferrite segregation band exists in the center of steel sheet, and there are a lot of MnS inclusions in segregation zone, which is expected the main reason for the central crack during process steel sheet.Accordingly the counter measurement has been proposed to solve the central cracks in SPA-H steel sheet.
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Key words:
- SPA-H steel /
- central crack /
- segregation /
- MnS inclusion
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