Analysis and improvement of surface defects of peritectic steel 15CrMoG billet

LIN Peng; ZHANG Hong-cai; ZUO Hui; XU Zheng-zhou; ZHAI Wan-li

doi:10.13228/j.boyuan.issn1005-4006.20220065

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Continuous Casting ›› 2023, Vol. 42 ›› Issue (1) : 61-65. DOI: 10.13228/j.boyuan.issn1005-4006.20220065

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Analysis and improvement of surface defects of peritectic steel 15CrMoG billet

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Abstract

Facing the quality problems of surface sag and longitudinal crack of steel leakage of 200 mm×200 mm continuous casting billet of peritectic steel 15CrMoG, the surface sag and breakout defects of casting billet are analyzed by surface inspection and test comparison. The result indicates that surface sag and longitudinal crack of steel leakage are caused by the uneven heat transfer between the crystallizer copper tube and the slag and the low intensity of secondary cooling. By changing the crystallizer copper tube taper from 0.72%/m to 1.10%/m and the basicity of slag from 0.72 to 1.05 and the viscosity from 0.44 Pa·s to 0.74 Pa·s and the melting temperature from 1 170 ℃ to 1 191 ℃ and the secondary cooling ratio water quantity from 0.30 L/kg to 0.45 L/kg,it improves the cooling heat transfer of the crystallizer and the cooling effect of the secondary cooling section and the cooling uniformity of casting billet. The result shows the defects of casting billet have been effective controlled.

Key words

peritectic steel / surface sag / longitudinal crack of steel leakage / crystallizer copper tube / slag / secondary cooling

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LIN Peng, ZHANG Hong-cai, ZUO Hui, et al. Analysis and improvement of surface defects of peritectic steel 15CrMoG billet[J]. Continuous Casting, 2023, 42(1): 61-65 https://doi.org/10.13228/j.boyuan.issn1005-4006.20220065

References

[1] 李亚强,刘建华,何杨,等. 15CrMoG钢棒材表面缺陷机理分析和工艺改进[J]. 特殊钢,2019,40(6):1.
[2] 梅宁,王宝动,刘延强,等. 包晶钢中间包快换板坯接痕漏钢原因分析[J]. 连铸,2021(3):40.
[3] 张晨,蔡得祥,徐国栋,等. 厚板包晶钢保护渣的开发与应用[J]. 连铸,2021(2):51.
[4] 任金亮,宋银财,张桂林,等. 包晶钢板坯连铸机结晶器液面波动的原因[J]. 河北冶金,2018(1):56.
[5] 张正林,王向红. A29管坯钢表面纵裂纹控制研究[J]. 连铸,2018 (6):71.
[6] 薛伟锋. 异型坯连铸二次冷却配水策略[J]. 连铸,2019(4):13.
[7] 洪钢,刘华松,董延楠,等. 微合金包晶钢高温奥氏体晶粒生长动力学研究[J]. 钢铁研究学报,2021,33(12):1270.
[8] 李亚强,刘建华,邓振强,等. 15CrMoG钢包晶凝固特征与机制[J]. 金属学报,2020,56(10):1335.
[9] 刘晓瑾,康健,李振垒,等. 热轧无缝钢管控制冷却关键技术的开发与工业应用[J]. 轧钢,2022,39(1):9.
[10] 吕庆功,许文婧,秦子. 热轧无缝钢管壁厚精度控制策略与方法[J]. 中国冶金,2020,30(11):53.
[11] 任刚,陈子刚,李金波,等. 包晶钢12Cr1MoVG小方坯表面凹陷原因及改进[J]. 河北冶金,2021(3):57.
[12] 李树森,张立峰,杨小刚,等. 亚包晶钢连铸坯角部横裂纹控制研究[J]. 炼钢,2016,32(3):67.
[13] 何庆文,李阳,王福明,等. 亚包晶钢Q235D连铸大方坯的质量控制[J]. 特殊钢,2010,31(4):34.
[14] 郭军力,文光华,符姣姣,等. 冷却速率对包晶钢凝固过程中包晶转变收缩的影响[J]. 金属学报,2019,55(1):1311.
[15] 蔡开科. 连铸坯质量控制[M]. 北京:冶金工业出版社,2010.
[16] 宋金平,陈兴华,朱定华,等. 大方坯低碳包晶钢连铸坯表面凹陷成因及对策[J]. 连铸,2011(1):138.
[17] 李玉娣,张发斌. 包晶钢板坯纵裂纹分析及保护渣优化[J]. 连铸,2021(2):57.
[18] 王林杰,孔令种,冯亮花,等. 高拉速方坯连铸结晶器钢渣界面行为特征[J]. 连铸,2021(4):11.
[19] 翁建军. 高碱度高润滑性连铸保护渣的研究和应用[J]. 炼钢,2016,32(1):52.
[20] 曹磊. 包晶钢连铸坯表面纵裂与保护渣性能选择[J]. 钢铁,2015,50(2):38.
[21] 米源. 结晶保护渣的性能和使用工艺[J]. 连铸,2007 (1):39.