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介绍了莱钢炼钢厂通过采用转炉顶底复吹模式、制定生产冷轧用低合金Q345B钢各工序窄成分控制标准、改进LF精炼工序铝脱氧和钙处理工艺、优化连铸保护浇注工艺、设计Q345B专用保护渣等手段优化工艺流程。生产实践表明,Q345B钢种的成品磷、硫质量分数分别控制在0.025%、0.010%以下,铸坯全氧稳定在0.004%以下,提高了钢水洁净度,降低了夹杂物级别,满足了用户的质量要求。
Introduced the Laiwu Steel Works through the use of converter top and bottom blowing mode, the development of cold-rolled low alloy steel Q345B steel narrow composition control standards to improve the LF refining process of aluminum deoxidation and calcium treatment process to optimize the casting casting process, Design Q345B special mold powder and other means to optimize the process. The production practice shows that the finished products phosphorus and sulfur content of Q345B steel are respectively controlled below 0.025% and 0.010%, the oxygen content of slab is kept below 0.004%, the cleanliness of molten steel is improved, the inclusion level is reduced, Quality requirements.