37Mn5钢管外折叠成因分析和工艺控制  

Analysis on Formation of Outer Fold of 37Mn5 Steel Tube and Process Control

作　　者：魏军[1,2] 洪慧平[1] 廖向军[1] 王孟[1] 李春雨[1] 康永林[1] 

机构地区：[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

出　　处：《特殊钢》2010年第1期30-32,共3页Special Steel

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SiO_2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。According to the analysis on outer fold defect of Φ85 mm× 8 mm tube of 37Mn5 steel （0. 39% C, 1.30% Mn）, it is obtained that the -20μm 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） ≤1%, white slag time ≥15 min and soft argon blowing ≥ 10 min in LF refining, shield casting in whole process, the [ O] is （ 11.6～17.1）×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 O. 5- 1. O, that are available to control the formation of outer fold of steel tube.

关 键 词：37Mn5钢管 外折叠 成因 工艺控制 

分 类 号：TF777[冶金工程—钢铁冶金]