Q550D钒氮钢特厚板组织性能与表面质量

doi:10.13251/j.issn.0254-6051.2021.04.011

金属热处理 ›› 2021, Vol. 46 ›› Issue (4): 65-69.DOI: 10.13251/j.issn.0254-6051.2021.04.011

Q550D钒氮钢特厚板组织性能与表面质量

麻衡¹, 霍孝新¹, 吴红艳², 高秀华², 杜林秀²

1.山东钢铁股份有限公司莱芜分公司技术中心, 山东莱芜 271100;
2.东北大学轧制技术及连轧自动化国家重点实验室, 辽宁沈阳 110819

收稿日期:2020-10-08 出版日期:2021-04-25 发布日期:2021-05-08
通讯作者: 吴红艳,副教授,博士,E-mail:wuhy@ral.neu.edu.cn
作者简介:麻衡(1985—),男,高级工程师,主要研究方向为高性能钢板材料研发与工艺技术研究,E-mail:maheng418@126.com。

Microstructure, properties and surface quality of Q550D V-N-microalloyed steel extra heavy plate

Ma Heng¹, Huo Xiaoxin¹, Wu Hongyan², Gao Xiuhua², Du Linxiu²

1. Technical Center, Laiwu Branch of Shandong Iron and Steel Co., Ltd., Laiwu Shandong 271100, China;
2. State Key Lab of Rolling and Automation, Northeastern University, Shenyang Liaoning 110819, China

Received:2020-10-08 Online:2021-04-25 Published:2021-05-08

摘要/Abstract

摘要： 研究了控轧控冷工艺对工业试生产的50 mm厚V-N微合金钢中厚板组织与性能的影响,利用光学显微镜、扫描电镜、透射电镜、拉伸试验机等对试验钢微观组织、力学性能及钢板表面质量进行了观察及分析。结果表明:试验钢在终冷温度为630 ℃时,显微组织由针状铁素体、多边形铁素体和少量粒状贝氏体组成,可观察到V(C,N)析出粒子。试验钢中部屈服强度达599 MPa,伸长率为20%,-20 ℃时的冲击吸收能量为199 J。降低钢中Al元素的含量,钢板表面质量得到了明显的改善。

关键词: V-N微合金钢, 中厚板, V(C,N)析出物, 表面质量

Abstract: Effect of controlled rolling and controlled cooling process on microstructure and properties of 50 mm thick V-N-microalloyed steel plate produced in industrial trial production was studied by means of OM, SEM,TEM and tensile tester. The results show that the microstructure of the steel is composed of acicular ferrite, polygonal ferrite and a small amount of granular bainite when the final cooling temperature is 630 ℃, and V(C, N) precipitated particles are observed. The yield strength of the middle part of the steel is 599 MPa, elongation is 20%, and -20 ℃ impact absorbed energy is 199 J. The results show that the surface quality of the plate is improved obviously by decreasing the content of Al in the steel.

Key words: V-N-microalloyed steel, medium plate, V(C,N) precipitation, surface quality

中图分类号:

TG339

麻衡, 霍孝新, 吴红艳, 高秀华, 杜林秀. Q550D钒氮钢特厚板组织性能与表面质量[J]. 金属热处理, 2021, 46(4): 65-69.

Ma Heng, Huo Xiaoxin, Wu Hongyan, Gao Xiuhua, Du Linxiu. Microstructure, properties and surface quality of Q550D V-N-microalloyed steel extra heavy plate[J]. Heat Treatment of Metals, 2021, 46(4): 65-69.

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Q550D钒氮钢特厚板组织性能与表面质量

Microstructure, properties and surface quality of Q550D V-N-microalloyed steel extra heavy plate

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