金属热处理 ›› 2024, Vol. 49 ›› Issue (2): 291-296.DOI: 10.13251/j.issn.0254-6051.2024.02.045

• 测试与分析 • 上一篇    下一篇

超级双相不锈钢S32750轧制开裂原因分析和解决措施

王海瑞1, 王锦永2, 刘富强2, 齐希伦2, 高正磊2   

  1. 1.鹤壁职业技术学院 机电工程学院, 河南 鹤壁 458030;
    2.邯郸新兴特种管材有限公司, 河北 邯郸 056300
  • 收稿日期:2023-06-06 修回日期:2023-12-04 出版日期:2024-03-27 发布日期:2024-03-27
  • 通讯作者: 王锦永,高级工程师,硕士,E-mail:wangjinyong000@163.com
  • 作者简介:王海瑞(1984—),男,讲师,硕士,主要研究方向为机械设计以及材料热处理的教学与研究,E-mail:sinohairui@126.com。
  • 基金资助:
    河南省科技攻关项目(182102210086);河南省高等学校重点科研项目(23B460027);鹤壁市重大科技创新专项(鹤财办预〔2020〕239号)

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

Wang Hairui1, Wang Jinyong2, Liu Fuqiang2, Qi Xilun2, Gao Zhenglei2   

  1. 1. Institute of Mechanical & Electrical Engineering, Hebi Polytechnic, Hebi Henan 458030, China;
    2. Handan Xinxing Special Pipe Co., Ltd., Handan Hebei 056300, China
  • Received:2023-06-06 Revised:2023-12-04 Online:2024-03-27 Published:2024-03-27

摘要: S32750钢属于耐腐蚀超级双相不锈钢,某批次的管材轧制过程中出现严重的开裂。运用光谱仪、光学显微镜、扫描电镜、拉伸试验机和冲击试验机等设备,结合轧制工艺和热挤压工艺,对材料的化学成分、非金属夹杂物、显微组织和力学性能进行了分析。结果显示,轧制前组织中存在大量Fe-Cr-Mo聚集的σ金属间相,脆性大,导致锻轧钢管开裂;锻轧前采用1100 ℃×60 min固溶处理后,σ金属间相充分溶解,强度、硬度降低,塑韧性提高,可解决锻轧开裂问题。

关键词: S32750超级双相不锈钢, 轧制开裂, 显微组织, 固溶处理

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

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