Phase transformation and corrosion resistance of Q450 acid-resistant steel

doi:10.13251/j.issn.0254-6051.2021.12.022

Abstract

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

CLC Number:

TG142

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.

References

[1]贾晖. 铁路车辆用耐候钢的现状及发展[J]. 武钢技术, 2003, 41(3): 59-63.
Jia Hui. Present situation and development of weathering steel for railway rolling stock[J]. Wisco Technology, 2003, 41(3): 59-63.
[2]郭晓宏, 刘志伟, 张瑞琦, 等. 鞍钢铁路货车车体用钢研发历程[J]. 鞍钢技术, 2018(4): 9-14.
Guo Xiaohong, Liu Zhiwei, Zhang Ruiqi, et al. Development process of steel used in Angang railway freight car body[J]. Angang Technology, 2018(4): 9-14.
[3]张武, 马玉平, 刘永刚, 等. 耐硫酸露点腐蚀用钢的研究与应用综述[J]. 安徽冶金, 2009(3): 25-27, 32.
Zhang Wu, Ma Yuping, Liu Yonggang, et al. Review on research and application of steel for dew-point corrosion resistance of sulfuric acid[J]. Anhui Metallurgy, 2009(3): 25-27, 32.
[4]孙根领. 耐硫酸露点腐蚀钢板的标准制定分析[J]. 山东冶金, 2013(1): 35-37.
Sun Genling. Standard formulation and analysis of dew-point corrosion resistant steel plate with sulfuric acid[J]. Shandong Metallurgical, 2013(1): 35-37.
[5]王俊山. 高耐蚀性铁路货车用S450EW钢的研制开发[D]. 沈阳: 东北大学, 2014.
[6]孙继友. 新一代钢铁材料在铁路货车车辆上的应用探讨[J]. 中国科技信息, 2007(1): 90-91.
Sun Jiyou. Discussion on the application of new generation iron and steel material in railway freight car[J]. China Science and Technology Information, 2007(1): 90-91.
[7]杨海洋, 黄桂桥, 丁国清, 等. 合金元素对耐候钢耐蚀性能的影响[J]. 环境技术, 2015, 32(2): 25-27.
Yang Haiyang, Huang Guiqiao, Ding Guoqing, et al. Effect of alloying elements on corrosion resistance of weathering steel[J]. Environmental Technology, 2015, 32(2): 25-27.
[8]高建兵, 王育田, 辛建卿, 等. 铁路货车用500 MPa级高强度耐大气腐蚀钢的研制[J]. 轧钢, 2017, 34(6): 21-24.
Gao Jianbing, Wang Yutian, Xin Jianqing, et al. Development of 500 MPa grade high strength atmospheric corrosion resistant steel for railway freight cars[J]. Rolling, 2017, 34(6): 21-24.
[9]Luo C, Qiu X M, Ye R, et al. Effect of Bi addition on the corrosion resistance and mechanical properties of sintered NdFeB permanent magnet/steel soldered joints[J]. Materials Science and Engineering A, 2020, 792: 139832.
[10]Liu G Y, Khorsand S, Ji S X. Electrochemical corrosion behaviour of Sn-Zn-xBi alloys used for miniature detonating cords[J]. Journal of Materials Science and Technology, 2019, 35(8): 1618-1628.
[11]Wang Y X, Tay S L, Zhou X W, et al. Influence of Bi addition on the property of Ag-Bi nano-composite coatings[J]. Surface & Coatings Technology, 2018, 349: 217-223.
[12]Yao M Y, Wu X T, Duan W R, et al. The influence of different contents of Bi addition on the corrosion behavior of various zirconium-based alloys[J]. Journal of Environmental Protection, 2016, 7(4): 495-501.
[13]Tok H Y, Hamzah E, Bakhsheshi-Rad H R. The role of bismuth on the microstructure and corrosion behavior of ternary Mg-1.2Ca-xBi alloys for biomedical applications[J]. Journal of Alloys and Compounds, 2015, 640: 335-346.
[14]Guan Y, Peng X. A novel electrodeposited Cu-Zn-Bi film with increased corrosion resistance in a 0.05 M K₂SO₄ solution[J]. Applied Surface Science, 2011, 258(2): 822-826.
[15]Krasovskii M O, Lavrenko V O, Kostenko L M. Anodic behavior of Al-Bi and Al-Sb alloys in 3%NaCl solution[J]. Powder Metallurgy and Metal Ceramics, 2010, 49(5/6): 347-350.