100 mm厚S420高强钢的热处理工艺及焊接性能

doi:10.13251/j.issn.0254-6051.2021.06.022

金属热处理 ›› 2021, Vol. 46 ›› Issue (6): 107-110.DOI: 10.13251/j.issn.0254-6051.2021.06.022

100 mm厚S420高强钢的热处理工艺及焊接性能

肖大恒¹, 张雅静², 何航¹, 脱臣德¹, 袁睿², 武会宾²

1.湖南华菱湘潭钢铁有限公司技术质量部, 湖南湘潭 411101;
2.北京科技大学钢铁共性技术协同创新中心, 北京 100083

收稿日期:2021-02-24 出版日期:2021-06-25 发布日期:2021-07-21
作者简介:肖大恒(1974—),男,高级工程师,学士,主要研究方向为钢铁材料新产品研发,E-mail:xiaodh123@126.com。
基金资助:
国家自然科学基金(51774033)

Heat treatment process and weldability of 100 mm thick S420 high strength steel

Xiao Daheng¹, Zhang Yajing², He Hang¹, Tuo Chengde¹, Yuan Rui², Wu Huibin²

1. Technical Quality Department, Xiangtan Iron & Steel Co., Ltd of Hunan Valin, Xiangtan Hunan 411101, China;
2. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China

Received:2021-02-24 Online:2021-06-25 Published:2021-07-21

摘要/Abstract

摘要： 采用低C低Si、Ni+Cr+Mo+Cu复合强化的理念设计了100 mm厚的S420高强钢,对钢板焊接前后的微观组织、力学性能和裂纹尖端张开位移CTOD进行了观察和测试。试验结果表明:经过900 ℃淬火+580 ℃回火后,钢板的综合性能达到最佳,屈服强度为478 MPa,抗拉强度为581 MPa,伸长率为28.4%;钢板焊后－40 ℃冲击性能优异,从焊缝至熔合线+5 mm处的过渡区内,心部冲击吸收能量稳定在100 J以上。CTOD性能检验结果显示,即使在性能最薄弱区域粗晶热影响区(CGHAZ),裂纹尖端张开位移(CTOD)值都高达1.59 mm。

关键词: 高强钢S420, 热处理, 焊接性能, 裂纹尖端张开位移(CTOD)

Abstract: A 100 mm thick S420 high strength steel was designed with the concept of low C, low Si and Ni+Cr+Mo+Cu composite strengthening. Microstructure observation, mechanical property test and crack tip opening displacement CTOD test were performed before and after welding. The test results show that after quenching at 900 ℃ and tempering at 580 ℃, the comprehensive properties of the steel plate reach the best. The yield strength is 478 MPa, the tensile strength is 581 MPa, and the elongation is 28.4%. After welding, the steel plate has excellent impact property at －40 ℃. From the welded seam to the fusion line +5 mm in the transition zone, the core impact absorbed energy is stable at more than 100 J. The CTOD performance test results show that the CTOD value is as high as 1.59 mm even in the coarse grained heated-affected zone (CGHAZ) with the weakest performance.

Key words: high strength steel S420, heat treatment, weldability, crack-tip opening displacement(CTOD)

中图分类号:

TG161

肖大恒, 张雅静, 何航, 脱臣德, 袁睿, 武会宾. 100 mm厚S420高强钢的热处理工艺及焊接性能[J]. 金属热处理, 2021, 46(6): 107-110.

Xiao Daheng, Zhang Yajing, He Hang, Tuo Chengde, Yuan Rui, Wu Huibin. Heat treatment process and weldability of 100 mm thick S420 high strength steel[J]. Heat Treatment of Metals, 2021, 46(6): 107-110.

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100 mm厚S420高强钢的热处理工艺及焊接性能

Heat treatment process and weldability of 100 mm thick S420 high strength steel

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