Reason analysis and solution of rolling cracking of super duplex stainless steel S32750

doi:10.13251/j.issn.0254-6051.2024.02.045

Abstract

Abstract: Serious cracking occurred in the rolling process of a batch of pipes made of S32750 super duplex stainless steel. The chemical composition, non-metallic inclusions, microstructure and mechanical properties of the pipe materials were analyzed by means of spectrograph, metallographic microscope, scanning electron microscope, tensile tester and impact tester, and combined with rolling process and hot extrusion process. The results show that there are a lot of σ-intermetallic phases with Fe-Cr-Mo segregation in the microstructure before rolling, which is brittle and leads to cracking of the rolled steel pipe. After solution treatment at 1100 ℃ for 60 min before rolling, the intermetallic phase σ is fully dissolved, the strength and hardness are reduced, while the plasticity and toughness are improved, which can solve the rolling cracking problem.

Key words: S32750 super duplex stainless steel, rolling cracking, microstructure, solution treatment

CLC Number:

TG156.6

Wang Hairui, Wang Jinyong, Liu Fuqiang, Qi Xilun, Gao Zhenglei. Reason analysis and solution of rolling cracking of super duplex stainless steel S32750[J]. Heat Treatment of Metals, 2024, 49(2): 291-296.

References

[1]高祥明, 裴明德, 李国平. 冷轧硬化对超级双相不锈钢S32750析出相的影响[J]. 钢铁, 2019, 54(9): 94-98.
Gao Xiangming, Pei Mingde, Li Guoping. Influence of cold rolling on precipitation of S32750 super duplex stainless steel[J]. Iron and Steel, 2019, 54(9): 94-98.
[2]聂飞, 梁祥祥, 张晓文, 等. S32750无缝钢管冷轧开裂原因分析及控制[J]. 钢管, 2019, 45(3): 19-23.
Nie Fei, Liang Xiangxiang, Zhang Xiaowen, et al. Investigation of causes for cracking of S32750 seamless steel tube during cold-rolling process and relevant control measures[J]. Steel Pipe, 2019, 45(3): 19-23.
[3]陆世英. 超级不锈钢和高镍耐蚀合金[M]. 北京: 化学工业出版社, 2012.
[4]樊学华, 于勇, 陈丽娟, 等. 高温高Cl^-含量环境中H₂S/CO₂分压对超级双相不锈钢UNS S32750点蚀行为的影响[J]. 腐蚀与防护, 2021, 42(2): 32-36.
Fan Xuehua, Yu Yong, Chen Lijuan, et al. Effects of H₂S/CO₂ partial pressures on pitting behavior of super duplex stainless steel UNS S32750 in a environment of high temperature and high chloride content[J]. Corrosion and Protection, 2021, 42(2): 32-36.
[5]丰涵, 周晓玉, 刘虎, 等. 特超级双相不锈钢的发展现状及趋势[J]. 钢铁研究学报, 2015, 27(4): 1-5.
Feng Han, Zhou Xiaoyu, Liu Hu, et al. Development and trend of hyper duplex stainless steels[J]. Journal of Iron and Steel Research, 2015, 27(4): 1-5.
[6]王曼, 沈强, 罗有心, 等. 固溶温度与冷变形量对S32750双相不锈钢管低温冲击性能的影响[J]. 金属热处理, 2022, 47(1): 233-238.
Wang Man, Shen Qiang, Luo Youxin, et al. Effect of solution temperature and cold deformation on microstructure and low temperature impact properties of S32750 duplex stainless steel tube[J]. Heat Treatment of Metals, 2022, 47(1): 233-238.
[7]李俊. 固溶处理对超级双相不锈钢S32750组织和性能的影响[J]. 特殊钢, 2012, 33(4): 64-66.
Li Jun. Effect of solid solution treatment on structure and properties of super duplex stainless steel S32750[J]. Special Steel, 2012, 33(4): 64-66.
[8]吴玖. 双相不锈钢[M]. 北京: 冶金工业出版社, 2000.
[9]孙永伟, 范芳雄, 王灵水. 热处理制度对UNS S32750超级双相不锈钢微观组织及腐蚀行为的影响[J]. 材料热处理学报, 2020, 41(6): 111-121.
Sun Yongwei, Fan Fangxiong, Wang Lingshui. Effect of heat treatment process on microstructure and corrosion behavior of UNS S32750 super duplex stainless steel[J]. Transactions of Materials and Heat Treatment, 2020, 41(6): 111-121.
[10]张文华. 不锈钢及其热处理[M]. 沈阳: 辽宁科学技术出版社, 2010.
[11]蔺晓亮, 陈兴润, 王宝君, 等. 固溶温度对S32750双相不锈钢组织和力学性能的影响[J]. 金属热处理, 2019, 44(12): 165-169.
Lin Xiaoliang, Chen Xingrun, Wang Baojun, et al. Effect of solution temperature on microstructure and mechanical properties of S32750 duplex stainless steel[J]. Heat Treatment of Metals, 2019, 44(12): 165-169.
[12]张学元, 刘骏. 沿海建筑用00Cr25Ni7Mo4N双相不锈钢的热处理与性能[J]. 金属热处理, 2019, 44(7): 150-155.
Zhang Xueyuan, Liu Jun. Heat treatment and properties of 00Cr25Ni7Mo4N duplex stainless steel for coastal construction[J]. Heat Treatment of Metals, 2019, 44(7): 150-155.
[13]侯冠宇, 刘润青, 梁平, 等. S32750超级双相不锈钢在低温模拟海水中的腐蚀行为[J]. 材料保护, 2018, 51(5): 30-33.
Hou Guanyu, Liu Runqing, Liang Ping, et al. Corrosion behavior of S32750 super duplex stainless steel in simulated seawater at low temperature[J]. Materials Protection, 2018, 51(5): 30-33.
[14]赵新, 刘长红, 李亚宁. 超级双相不锈钢 UNS S32750的热加工图[J]. 热加工工艺, 2015, 44(15): 153-155.
Zhao Xin, Liu Changhong, Li Yaning. Hot processing map of super duplex stainless steel UNS S32750[J]. Hot Working Technology, 2015, 44(15): 153-155.
[15]王玉峰. S32750双相不锈钢锻造与固溶处理工艺研究[D]. 洛阳: 河南科技大学, 2020.