Q450耐酸钢的相变及耐蚀性能

doi:10.13251/j.issn.0254-6051.2021.12.022

金属热处理 ›› 2021, Vol. 46 ›› Issue (12): 135-141.DOI: 10.13251/j.issn.0254-6051.2021.12.022

Q450耐酸钢的相变及耐蚀性能

王震¹, 胡德勇², 孙超³, 高秀华¹, 吴红艳¹, 杜林秀¹

1.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;
2.河钢集团承钢分公司, 河北承德 067102;
3.河钢集团钢铁研究总院, 河北石家庄 050000

收稿日期:2021-07-15 出版日期:2021-12-25 发布日期:2022-02-18
通讯作者: 吴红艳,副教授,博士,E-mail:wuhy@ral.neu.edu.cn
作者简介:王震(1992—),男,硕士研究生,主要研究方向为耐大气和耐硫酸腐蚀钢,E-mail:2399878781@qq.com。

Phase transformation and corrosion resistance of Q450 acid-resistant steel

Wang Zhen¹, Hu Deyong², Sun Chao³, Gao Xiuhua¹, Wu Hongyan¹, Du Linxiu¹

1. State Key Laboratory of Rolling Technology and Continuous Rolling Automation, Northeastern University, Shenyang Liaoning 110819, China;
2. Chenggang Branch, Hegang Group, Chengde Hebei 067102, China;
3. Iron and Steel Research Institute, Hegang Group, Shijiazhuang Hebei 050000, China

Received:2021-07-15 Online:2021-12-25 Published:2022-02-18

摘要/Abstract

摘要： 针对含0.09%Bi的铁路敞车用新型耐酸钢,通过热模拟试验,绘制了动态CCT曲线,进行实验室轧制,利用全浸试验方法和电化学试验方法对其耐硫酸腐蚀性能进行了研究。结果表明:随着冷速提高,显微组织由珠光体+铁素体逐渐完全转变为贝氏体,同时组织细化。在实验室热轧后水冷至622 ℃,石棉卷取保温冷至室温,得到的组织为铁素体+少量贝氏体;经全浸腐蚀试验,腐蚀后表面腐蚀产物平整,腐蚀较轻,其力学性能和耐硫酸腐蚀性能均满足Q/ASB 174—2016要求。电化学试验研究表明,试验钢自腐蚀电位、自腐蚀电流和腐蚀速率均优于Q345B钢,表面富含Cu₂S的致密腐蚀产物氧化膜对耐蚀性提高作用明显。

关键词: 含Bi耐酸钢, 动态CCT曲线, 显微组织, 全浸腐蚀, 电化学腐蚀

Abstract: A new type of acid-resistant steel containing 0.09%Bi for railway open car was developed. The dynamic CCT curve was drawn through thermal simulation test, and the sulfuric acid corrosion resistance of the steel was studied by means of full immersion test and electrochemical test. The results show that with the increase of cooling rate, the microstructure changes from pearlite+ferrite to bainite and is refined. After hot rolling in the laboratory, water cooling to 622 ℃, and then asbestos coil cooling to room temperature, the microstructure obtained is ferrite and a small amount of bainite. After full immersion corrosion test, the corrosion products on the surface of the steel is smooth and the corrosion is light, and the mechanical properties and sulfuric acid corrosion resistance of the steel meet the requirements of Q/ASB 174—2016 standard. The electrochemical corrosion test show that the self-corrosion potential, self-corrosion current and corrosion rate of the steel are better than that of the Q345B steel, and the oxide film with dense corrosion products rich in Cu₂S on the surface significantly improves the corrosion resistance.

Key words: acid-resistant steel containing Bi, dynamic CCT curve, microstructure, full immersion corrosion, electrochemical etching

中图分类号:

TG142

王震, 胡德勇, 孙超, 高秀华, 吴红艳, 杜林秀. Q450耐酸钢的相变及耐蚀性能[J]. 金属热处理, 2021, 46(12): 135-141.

Wang Zhen, Hu Deyong, Sun Chao, Gao Xiuhua, Wu Hongyan, Du Linxiu. Phase transformation and corrosion resistance of Q450 acid-resistant steel[J]. Heat Treatment of Metals, 2021, 46(12): 135-141.

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Q450耐酸钢的相变及耐蚀性能

Phase transformation and corrosion resistance of Q450 acid-resistant steel

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