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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。
The reasons for the formation of transverse crack of SS400 boron-containing steel were studied by means of high-temperature mechanical properties test of slab and surface SEM analysis of defects, and the solution of component adjustment and corresponding process adjustment was put forward. Through the comparison of the test results of high temperature mechanical properties of different composition samples, it is found that the third brittleness interval of slab with different carbon content is obviously different. With the increase of carbon content, the third brittle zone moved left. According to the experimental results, the system composition of SS400 boron-containing steel was adjusted and the method of reducing the cooling strength at the corners of the slab was adopted to avoid the occurrence of angle transverse crack of SS400 boron-containing steel slab.