70 t LD-LF-VD-CC流程生产耐候钢S355J2的工艺实践

特殊钢 ›› 2016, Vol. 37 ›› Issue (1): 37-39.

70 t LD-LF-VD-CC流程生产耐候钢S355J2的工艺实践

李雪兆¹, 李双江², 董丽霞¹, 白肖峰³

1中钢石家庄工程设计研究院有限公司,石家庄050000；
2河北钢铁技术研究总院,石家庄050000；
3承德建龙实业有限公司，承德067201

收稿日期:2015-08-27 出版日期:2016-02-01 发布日期:2022-08-24
作者简介:李雪兆(1968-)，男，高级工程师，1990年华北理工大学(本科)毕业，炼钢、连铸设计及应用技术开发。

Practice of Process for Production of Weathering Steel S355J2 by 70 t LD-LF-VD-CC Flowsheet

Li Xuezhao¹, Li Shuangjiang², Dong Lixia¹ ,Bai Xiaofeng³

1 Sinosteel Shijiazhuang Engineering Design & Research Institute Co Ltd, Shijiazhuang 050000;
2 Hebei Centre Iron & Steel Technology Research Institute, Shijiazhuang 050000 ；
3 Chengde Jianlong Industry Co Ltd, Chengde 067201

Received:2015-08-27 Published:2016-02-01 Online:2022-08-24

摘要/Abstract

摘要： 耐候钢S355J2(/%:0.07~0.12C,0.25~0.40Si,1.0~1.3Mn,≤0.015P,≤0.008S,0.25~0.40Cu,0.35~0.50Cr,0.10~0.25Ni,0.025~0.040Nb,0.025~0.050Als)的冶炼流程为70 t LD-LF-VD-280 mm×320 mm坯CC工艺。通过控制LD终点[C]≤0.07%,终点[P]≤0.014%,转炉下渣量≤2 kg/t和LF精炼渣碱度R≥3.0,(Al₂O₃)=20%等工艺措施,铸坯的T[O]为22×10^-6,夹杂物平均直径为4.6μm,5μm以下夹杂物比例在97.5%以上。连铸过程采用R=1.02,6.9%(B₂O₃+Li₂O),5.4%MgO和7.6% Al₂O₃的含氟保护渣,连铸坯表面震痕较浅,表面无清理率达到95.17%。连铸坯缩孔、疏松≤1.0级,角部、边部和中心裂纹为0级,满足连铸坯质量的控制要求。

关键词: 70 t LD-LF-VD-CC, , S355J2耐候钢, 冶金质量, 夹杂物

Abstract: The metallurgical flowsheet of weathering steel S355J2 (/% : 0. 07 ~0. 12C, 0.25 ~0. 40Si,1.0 ~1. 3Mn, ≤0. 015P, ≤0. 008S,0. 25 ~0. 40Cu, 0. 35 ~0. 50Cr, 0. 10 〜0. 25Ni, 0. 025 ~ 0. 040Nb, 0. 025 ~0. 050Als) is 70 t LD-LF-VD-280 mm x 320 mm bloom CC process. With the process measures including controlling LD end [C]≤0. 07% , end [P] ≤0. 014% , converter tapping slag amount ≤2 kg/t, and refining slag basicity R ≥3.0 and (A1₂O₃)= 20% , the T[O] in casting bloom is 22 x 10 ^-6, average diameter of inclusions is 4. 6 μm with ratio of less than 5 μm inclusions more than 97. 5%. By using the bearing fluorine mold powder with basicity = 1. 02, 6. 9% ( B₂O₃+ Li₂0), 5. 4% MgO and 7. 6% A1₂O₃, the bloom oscillation mark is slight, and the ratio of bloom surface without cleaning is up to 95. 17% . The rating of shrinkage and porosity of bloom ≤l. 0, and the rating of crack at comer, edge and center of bloom is 0 to meet the control requirement of bloom quality.

Key words: 70 t LD-LF-VD-CC, , Weathering Steel S355J2, , Metallurgical Quality, , Inclusions

李雪兆, 李双江, 董丽霞, 白肖峰. 70 t LD-LF-VD-CC流程生产耐候钢S355J2的工艺实践[J]. 特殊钢, 2016, 37(1): 37-39.

Li Xuezhao, Li Shuangjiang, Dong Lixia, Bai Xiaofeng. Practice of Process for Production of Weathering Steel S355J2 by 70 t LD-LF-VD-CC Flowsheet[J]. Special Steel, 2016, 37(1): 37-39.