SS400含硼钢连铸板坯的角横裂纹  

Transverse Corner Crack of Boron Alloyed SS400 Steel

作　　者：张宏艳[1] 薛勇强 李秋民 田志红[1] 李永林[1] 朱立新[1] 

机构地区：[1]首钢集团技术研究院,北京100043 [2]首钢京唐钢铁联合有限责任公司制造部,河北唐山063200

出　　处：《物理测试》2013年第5期17-20,共4页Physics Examination and Testing

摘　　要：通过铸坯的高温力学性能测试及缺陷表面SEM分析等手段研究了SS400含硼钢角横裂纹的形成原因,提出了成分调整配合相应工艺调整的解决方案。通过不同成分试样的高温力学性能测试结果对比发现,不同碳含量铸坯第Ⅲ脆性区间明显不同。随着碳含量增加,第Ⅲ脆性区左移。根据试验结果调整了SS400含硼钢成分体系,采取减弱铸坯角部冷却强度等方法,有效地避免了SS400含硼钢铸坯角横裂纹的发生。According to the analysis on high-temperature mechanical property and scanning electron microscopy （SEM） detection to the defects surfaces of the slab sample, the mechanism of the cracks was found. So the measure was put forward by adjusting the chemical constituents of the steel with corresponding technological processing. The results of high-temperature mechanical property tests in different composition systems show that the third brit- tle zone varies with the carbon content and this zone will move left with the carbon content increases. So one kind of composition system of this steel was put forward according to the results with softer second cooling water on the slab corner, and now the corner cracks occur rarely.

关 键 词：角横裂纹 连铸 高温力学性能 

分 类 号：TG249.7[金属学及工艺—铸造]