Abstract: According to analysis on the scab defects on the surface of 10B21 boron-containing steel (/% ：0.18 〜 0.23C, ≤ l.0Si, 0.60 ~0.90Mn,≤ 0.025P, ≤ 0.020S, ≥0.015 Alt, ≥0.008B) wire rod and the surface cracks on the comers of continuous casting billet, by optimizing the composition control of steel (/% ：0.020 ~ 0.050Alt,0.03 〜0.05Ti, ≤0.0060N,0.000 8 ~0.0012B) , increasing the drawing speed to 2.3 ~2.4 m/min to ensure the through stretching and straightening temperature of the slab ≥980 ℃；by reducing the specific water strength of the secondary cooling of continuous casting from original 1.29 L/kg to 1.05 L/kg, etc, that can effectively control the comer crack on the surface of continuous casting billet, the scale defect rate is declined from the original 15% to less than 1% after the roiled wire rod.

摘要： 针对10B21含硼钢(/%:0.18～0.23C,≤1.0Si,0.60～0.90Mn,≤0.025P,≤0.020S,≥0.015Alt,≥0.008B)盘条表面铁皮疤缺陷及连铸坯角部表面裂纹进行了分析,通过优化钢的成分控制(/%:0.020～0.050Alt,0.03～0.05Ti,≤0.0060N,0.000 8～0.0012B)提高拉速至2.3～2.4 m/min以保证铸坯过拉矫时温度≥980℃,采取将连铸二冷比水强度由原1.29 L/kg降至1.05 L/kg等措施,可以有效控制连铸坯角部表面裂纹的出现,轧制后的盘条表面铁皮疤缺陷率由原来的15%降到1%以下。

关键词: 含硼冷镦钢10B21, 合金成分, 表面裂纹, 工艺优化