| 37Mn5钢管外折叠成因分析和工艺控制 |
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| 引用本文： | 魏军,洪慧平,廖向军,王孟,李春雨,康永林.37Mn5钢管外折叠成因分析和工艺控制[J].特殊钢,2010,31(1):30-32. |
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| 作者姓名： | 魏军 洪慧平 廖向军 王孟 李春雨 康永林 |
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| 作者单位： | 1北京科技大学材料科学与工程学院，北京100083；
2承德建龙特殊钢有限公司，承德067201 |
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| 摘 要： | 通过对37Mn5钢(%:0.39C、1.30Mn)Φ85 mm×8 mm管外折叠缺陷的分析,得出钢晶界处存在尺寸～20μm的硅酸盐和SiO2等脆性夹杂物是钢管外折叠形成的主要原因。通过控制转炉出钢后钢包顶渣厚度≤50mm,LF精炼(FeO)≤1%,白渣时间≥15 min,软吹氩≥10 min,全程保护连铸,使O]为(11.6～17.1)×10-6,钢中夹杂级别A类为0～2.0,B、C类为0,D类为0.5～1.0,有效地控制钢管外折叠的发生。
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| 关 键 词： | 37Mn5钢管 外折叠 成因 工艺控制 |
Analysis on Formation of Outer Fold of 37Mn5 Steel Tube and Process Control |
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| Wei Jun,Hong Huiping,Liao Xiangjun,Wang Meng,Li Chunyu,Kang Yonglin.Analysis on Formation of Outer Fold of 37Mn5 Steel Tube and Process Control[J].Special Steel,2010,31(1):30-32. |
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| Authors: | Wei Jun Hong Huiping Liao Xiangjun Wang Meng Li Chunyu Kang Yonglin |
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| Affiliation: | 1 School of Materials Science and Engineering, University of Science and Technology, Beijing 100083 ；
2 Chengde Jianlong Special Steel Co, Ltd, Chengde 067201 |
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| Abstract: | According to the analysis on outer fold defect of Φ85 mm x 8 mm tube of 37Mn5 steel (0. 39% C, 1. 30% Mn) , it is obtained that the ~ 20 μm brittle inclusions-silicate and SiO2 existing at grain boundary in steel is main reason for formation of tube outer fold. With controlling thickness of top slag ≤50 mm in ladle after LD tapping, (FeO)≤l% , white slag time ≥15 min and soft argon blowing ≥10 min in LF refining, shield casting in whole process, the 0 ] is (11. 6 - 17. 1) x 10-6 and the rating of inclusions in steel of A series is 0 ~ 2. 0，of B and C series is 0 and of D series is 0. 5 ~ 1. 0, that are available to control the formation of outer fold of steel tube. |
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| Keywords: | 37Mn5 Steel Tube Outer Fold Reason for Formation Process Control |
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