Nb-V微合金化H型钢BS55C表面裂纹成因分析

特殊钢 ›› 2006, Vol. 27 ›› Issue (1): 45-47.

Nb-V微合金化H型钢BS55C表面裂纹成因分析

刘建华¹, 包燕平¹, 周杰¹, 杜松林², 李建中², 汤寅波²

1北京科技大学冶金与生态工程学院，北京100083;2马鞍山钢铁股份有限公司，马鞍山243002

收稿日期:2005-07-15 出版日期:2006-02-01 发布日期:2006-02-01
作者简介:刘建华(1966-),男，博士，副教授，从事精炼连铸研究

An Analysis on Surface Cracks Formation of H Beam of Nb-V Microalloying Steel BS55C

Liu Jianhua¹,Bao Yanping',Zhou Jie¹,Du Songlin²,Li Jianzhong², Tang Yinbo²

1 School of Metallurgical and Ecological Engineering,University of Science and Technology,Beijing 100083;
2 Maanshan Iron and Steel Co Ltd,Maanshan 243002

Received:2005-07-15 Published:2006-02-01 Online:2006-02-01
Supported by:
本课题为国家技术创新项目([2002]566)

摘要/Abstract

摘要： 分析了成分为(%):0.14~0.17C,0.45~0.55Si,1.25~1.45Mn,0.08~0. 10V,0.03～0.05Nb H 型钢BS55C表面裂纹形成原因。结果表明，该钢凝固时纵裂的敏感性较大，700~950℃范围内的塑性较低，使H 型钢表面易产生裂纹。由168炉Nb-V微合金化H 型钢BS55C生产数据分析得出，采用LF精炼，控制钢中S≤ 0.015%、P≤0.020%,优化浇铸水口，采用弱二次水冷工艺，避免在700~900℃范围矫直，可有效减少Nb-V微合金化H 型钢的表面裂纹

Abstract: The causes of surface cracks formation of H beam of Nb-V microalloying steel BS55C-0. 14~0. 17C,0.45~0.55Si,1.25~1.45Mn,0.08～0. 10V,0.03～0.05Nb have been analyzed. The results showed that the steel was sensitive to longitudinal crack at solidification and its plasticity at 700~950 ℃ was lower,therefore,the cracks were easily produced at surface of H beam. Based on analysis of 168 heats production data of Nb-V microalloying steel BS55C,it was obtained that it was available to effectively decrease the surface cracks of H beam of Nb-V microalloying steel by using LF refining,controlling [s]≤0.015% and [P]≤0.020%,optimizing cast nozzle, adopting weak secondary water cooling and avoiding straightening at 700～900 ℃

刘建华, 包燕平, 周杰杜, 松林, 李建中, 汤寅波 . Nb-V微合金化H型钢BS55C表面裂纹成因分析[J]. 特殊钢, 2006, 27(1): 45-47.

Liu Jianhua , Bao Yanping, Zhou Jie, Du Songlin, Li Jianzhong, Tang Yinbo. An Analysis on Surface Cracks Formation of H Beam of Nb-V Microalloying Steel BS55C[J]. Special Steel, 2006, 27(1): 45-47.