高强钢筋方坯内部质量影响因素分析及优化

Analysis and optimization of factors affecting internal quality of casting billets for high-strength steel bars

为减少河钢集团承钢公司生产某种高强钢筋铸坯时产生的内部质量问题,通过对铸坯试样的低倍检测与统计,采用单因素法对比,分析钢水过热度、拉速、二冷比水量、保护渣有无烘烤等因素对铸坯的中心偏析、中心疏松、角裂纹及中间裂纹的影响。结果表明:钢水过热度控制在16~25℃,拉速1.70 m/min,二冷比水量为1.0 L/kg,烘烤保护渣的条件下可有效提高铸坯内部质量。

In order to reduce the internal quality problems of high-strength steel bars billets produced by HBIS Cheng Steel,the single factor method was used to analyze the effects of molten steel superheat,casting speed,secondary cooling intensity and whether the mould powder is baked on the central segregation,center porosity,corner crack and intermediate crack of billets by macrostructure analysis and statistics of casting billets.The results show that the superheat of molten steel is controlled within the range of 16-25℃,the casting speed is 1.70 m/min,and the secondary cooling intensity is 1.0 L/kg and under the condition of baking mould powder,the internal quality of the billets can be effectively improved.