摘要:
分层缺陷是一种存在于钢板内部的常见缺陷,分层缺陷严重影响钢板的综合性能,尤其对厚度方向上的力学性能有重要影响。利用OM、SEM和EDS等检测手段,对分层缺陷区进行组织观察和微观分析,对其成因进行分析。结果表明:引起分层缺陷的原因主要有带状组织,保护渣,硫化物,折叠,异常组织等。针对上述各种原因,提出控制浇铸温度与冷却速度、注重结晶器保护渣相关工艺流程、钙化处理、稳定轧制、防止"死辊"现象的出现、选取适当的淬火工艺等相应的措施。
关键词:
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钢板 /
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分层缺陷 /
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组织异常 /
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夹杂 /
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折叠
Abstract:
Lamination defects are commonly present inside steel plate,and they have a serious impact on the comprehensive properties of steel plate,in particular to the Z direction.Microstructure observation and microanalysis of lamination defects are carried out by using OM、SEM and EDS.Causes of common steel plate lamination defect are analyzed.The results show that the main cause of lamination defect include banded structure,mould powder,sulfide,folding,abnormal structure etc.Therefore,countermeasures for the processes like control of casting temperature and cooling rate,optimizing the process related to the mould powder,calcium treatment,stabe rolling and avoiding feed roll stalling are proposed together with appropriate quenching process.
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