SWRH82B钢生产工艺分析及优化

Production Process Analysis and Optimization of SWRH82B Steel

根据莱钢永锋公司炼钢厂生产的实际情况,分析了SWRH82B钢生产过程中铸坯内外部质量控制情况。通过优化调节二冷水量及拉速温度匹配,铸坯的低倍质量提升明显,中心疏松≯1.5级、中心偏析≯1.5级、缩孔≯1.5级、中间裂纹≯0.5级、中心裂纹≯0.5级、皮下裂纹≯0.5级、角部裂纹≯0.5级、夹杂物0级。通过调整精炼渣碱度及连铸稳态控制,铸坯夹杂物明显改善,A类细系≯1级、B类细系≯1级、C类细系≯1.5级、D类细系≯0.5级、Ds类≯0.5级。终点碳由0.11%提高到0.22%,进精炼温度由原来的1 460℃提高到1 490℃以上,降低成本效果显著。

According to the actual situation of the production of the steelmaking plant of Shandong Laigang Yongfeng steel company,the internal and external quality control of the slab for SWRH82B production was analyzed.By optimizing and adjustment of secondary cooling water and temperature and casting speed matching,the microscopic quality of the slab was improved obviously.The center porosity is less than grade 1.5,center segregation is less than grade 1.5,contraction cavity is less than grade 1.5,intermediate crack is less than grade 0.5,centre burst is less than grade 0.5,subsurface crack is less than grade 0.5,corner crack is less than grade 0.5 and the inclusion is grade 0.By adjusting basicity of refining slag and steady state control of continuous casting,the inclusions in slab were obviously improved.The grade of type A inclusion is less than 1,type B inclusion is less than 1,type C inclusion is less than 1.5,the grade of type D and Ds inclusions are less than 0.5 The content of carbon at end point is from 0.11% to 0.22% and incoming refining temperature was raised from1 460 ℃ to 1 490 ℃,then the effect of cost reduction is remarkable.