CAJ | 학술논문

安钢生产的含硼普碳钢宽板坯出现大量表面纵裂纹，为降低其对产品质量的影响，对其产生原因进行了理论分析和生产试验研究，结果表明，引起含硼普碳钢宽板坯纵裂纹的原因是结晶器内钢中B在树枝晶晶界偏析和钢质带来的凝固坯壳厚度差异，以及凝固坯壳收缩不均匀和拉速波动导致坯壳开裂。通过优化转炉脱氧工艺、调整硼合金加入时机和加入量、制定合理的结晶器冷却制度、改进拉速控制和液面操作等措施，降低了含硼钢铸坯的裂纹发生率，提高了产品质量和铸坯合格率。
안강생산적함붕보탄강관판배출현대량표면종렬문，위강저기대산품질량적영향，대기산생원인진행료이론분석화생산시험연구，결과표명，인기함붕보탄강관판배종렬문적원인시결정기내강중B재수지정정계편석화강질대래적응고배각후도차이，이급응고배각수축불균균화랍속파동도치배각개렬。통과우화전로탈양공예、조정붕합금가입시궤화가입량、제정합리적결정기냉각제도、개진랍속공제화액면조작등조시，강저료함붕강주배적렬문발생솔，제고료산품질량화주배합격솔。
Numerous longitudinal cracks appeared on the surfaces of the wide plain boron carbon steel slab made in Anyang Steel .To reduce their influence on products quality , we analyzed theoretically the causes and made production experiments .The results show that the causes of the cracks on steel surfaces are that there are slab solidification shell thickness differences , which are caused by boron boundary seg-regation in the branches of crystal grain in mold and the quality of molten steel , and also uneven contrac-tion of slab solidification shell and casting speed fluctuation .Through such measures as optimizing con-verter de-oxidation process , adjusting the addition amount and time of boron alloy , working out reasona-ble mold cooling regulation , improving the casting speed control and mold level control etc ., the crack ratio of boron steel is reduced , and both product quality and cast slab qualification rate are enhanced .