Nb-V-Ti微合金化低合金钢SG610E 250 mm×2000 mm连铸尾坯封顶工艺试验与实践

特殊钢 ›› 2021, Vol. 42 ›› Issue (3): 31-34.

所属专题：连铸工艺

Nb-V-Ti微合金化低合金钢SG610E 250 mm×2000 mm连铸尾坯封顶工艺试验与实践

曹磊，马保振，黄伟青，韩立浩，石永亮

河北工业职业技术学院材料工程系

收稿日期:2020-11-12 出版日期:2021-05-15 发布日期:2022-11-11
作者简介:曹磊(1984-)，男，硕士,2010年东北大学毕业，高效炼钢连铸研究。
基金资助:
河北省自然基金(E2017417008)；河北工业职业技术学院科研项目(yzk2O2OOO5)资助

Test and Practice on Capping Process of 250 mm x 2 000 mm Casting Tail Slab of Nb-V-Ti Microalloying Low Alloy Steel SG610E

Cao Lei, Ma Baozhen, Huang Weiqing, Han Lihao, Shi Yongliang

Material Engineering Department, Hebei College of Industry and Technology, Shijiazhuang 050000

Received:2020-11-12 Published:2021-05-15 Online:2022-11-11

摘要/Abstract

摘要： 针对低合金钢SG610E 250 mm ×2 000 mm连铸尾坯封顶工艺进行了试验研究,结果表明,传统的打水封顶工艺,在距离铸坯尾部2 000 mm范围内存在严重的中心缩孔,而低拉速无水封顶可以将缩孔尾坯长度减小到了 900 mm。但是由于低拉速无水封顶工艺,拉速≤0.2 m/min持续时间长,导致连铸坯表面温度降低,进入第三脆性区,Nb-V-Ti微合金化低合金钢连铸尾坯表面出现了表面横裂纹。为此,开发了一种宽厚板连铸机拉速0.4 m/min不停机无水封顶方法,不仅获得了良好的连铸尾坯内部质量,同时解决了该钢连铸尾坯表面横裂纹的问题。

关键词: Nb-V-Ti微合金化低合金钢SG610E, 连铸尾坯, 打水封顶, 无水封顶, 表面横裂纹

Abstract: The capping technology of low alloy steel SG610E 250 mm x2 000 mm continuous casting tail slab is studied. The results show that with traditional water-cooling capping process, there are severe shrinkage cavities at distance 2 000 mm from the slab end；while with the low-speed casting anhydrous capping,the distance of slab shrinkage cavities decreases to 900 mm,but the slab surface temperature drops into the third brittle zone due to the long duration of ≤0. 2 m/ min casting speed, which lead to transverse cracks on Nb-V-Ti microalloying low alloy steel casting tail slab. Therefore, a non-stopped-pouring speed casting 0.4 m/min anhydrous capping technology for wide and thick slab is developed which improves the internal quality and reduces the surface crack incidence of the steel tail slab.

Key words: , Nb-V-Ti Microalloying Low Alloy Steel SG610E, Continuous Casting Tail Slab, Water-Cooling Capping, Anhydrous Capping, Surface Transverse Crack

曹磊, 马保振, 黄伟青, 韩立浩, 石永亮. Nb-V-Ti微合金化低合金钢SG610E 250 mm×2000 mm连铸尾坯封顶工艺试验与实践[J]. 特殊钢, 2021, 42(3): 31-34.

Cao Lei, Ma Baozhen, Huang Weiqing, Han Lihao, Shi Yongliang. Test and Practice on Capping Process of 250 mm x 2 000 mm Casting Tail Slab of Nb-V-Ti Microalloying Low Alloy Steel SG610E[J]. Special Steel, 2021, 42(3): 31-34.

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Nb-V-Ti微合金化低合金钢SG610E 250 mm×2000 mm连铸尾坯封顶工艺试验与实践

Test and Practice on Capping Process of 250 mm x 2 000 mm Casting Tail Slab of Nb-V-Ti Microalloying Low Alloy Steel SG610E

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