论文部分内容阅读
低碳Si-Mn-B钢(%:0.16～0.17C、1.10～1.12Si、1.80～1.85Mn、0.0010～0.001 1 B)部分连铸板坯在多次搬运后发生横向断裂。对断裂与未断裂铸坯进行连铸工艺、铸坯成分、组织和力学性能的分析表明,二者连铸工艺相同,断裂板坯S含量为0.004%,P含量为0.025%,中间裂纹1.5级,组织中有穿晶裂纹,未断裂板坯S含量0.004%,P含量0.008%,中间裂纹0级,组织中未发现显微裂纹,说明板坯中P含量偏高导致板坯多次搬运后断裂。
Some continuous cast slabs of low carbon Si-Mn-B steels (%: 0.16 ~ 0.17C, 1.10 ~ 1.12Si, 1.80 ~ 1.85Mn, 0.0010 ~ 0.001 1 B) The analysis of the continuous casting process, the composition, microstructure and mechanical properties of the billet shows that the two have the same continuous casting process, the S content of the cracked slab is 0.004%, the P content is 0.025%, the intermediate crack is 1.5 , There are transgranular cracks in the structure, the content of un-cracked slab S is 0.004%, the content of P is 0.008%, and the intermediate crack 0, and no microcracks are found in the structure, indicating that the high content of P in the slab results in the slab being transported repeatedly fracture.