降低含铝钢表面横裂纹的工艺实践

针对南阳汉冶特钢有限公司250 mm×1 650 mm断面生产的含铝钢表面角部横裂缺陷,从连铸工艺角度分析了含铝钢表面角部横裂产生的原因,提出了控制解决措施。通过优化结晶器振动参数、二冷控制模型、结晶器冷却模型、严控扇形段接弧精度及辊缝开口度、钢种成分控制优化等措施,提高了铸坯表面质量,板坯角部横裂缺陷得到了改善,铸坯不清理装炉率大幅提高,轧板裂纹缺陷率由14.48%降低至6.24%。

Practice process of reducing surface transverse crack of aluminum containing steel

Aiming at the transverse corner crack defects of aluminum bearing steel 250 mm×1 650 mm surface corner produced by Nanyang Hanye Special Steel Co., Ltd. The causes of the transverse corner crack on aluminum bearing steel surface corner were analyzed from the perspective of continuous casting process, and the control measures were put forward. By optimizing the mould vibration parameters, secondary cooling control model, mold cooling model, and strictly controlling the arcing accuracy of the sector and the opening of the roll gap, steel composition controlling and optimizing measures, The surface quality of the cast slab was improved, the transverse crack defects of the slab corner were improved, the rate of casting billet not cleaning and charging furnace was greatly increased, and the rate of rolling plate crack defect was reduced from 14.48% to 6.24%.