金属热处理 ›› 2025, Vol. 50 ›› Issue (8): 298-300.DOI: 10.13251/j.issn.0254-6051.2025.08.047

• 失效分析 • 上一篇    下一篇

抽油杆断裂失效分析

韩克甲1,2, 曹颖1,2, 周超1,2, 李洪伟2, 丁烁锟1,2   

  1. 1.国家泵类产品质量检验检测中心, 山东 淄博 255000;
    2.淄博市检验检测计量研究总院, 山东 淄博 255000
  • 收稿日期:2025-02-28 修回日期:2025-06-17 出版日期:2025-08-25 发布日期:2025-09-10
  • 作者简介:韩克甲(1984—),男,高级工程师,主要研究方向为金属材料检验检测及相关产品失效分析和质量鉴定,E-mail:hkjhkj203@163.com
  • 基金资助:
    国家市场监管总局科技计划(2024MK072)

Failure analysis of sucker rod fracture

Han Kejia1,2, Cao Ying1,2, Zhou Chao1,2, Li Hongwei2, Ding Shuokun1,2   

  1. 1. National Pump Product Quality Inspection and Testing Center, Zibo Shandong 255000, China;
    2. Zibo Municipal General Institute of Inspection and Metrology, Zibo Shandong 255000, China
  • Received:2025-02-28 Revised:2025-06-17 Online:2025-08-25 Published:2025-09-10

摘要: 采用宏观观察、金相检验、化学成分分析、断口分析及硬度测试等方法对某30CrMnSiNi2A钢抽油杆断裂原因进行分析。结果表明,抽油杆失效断裂是因脱碳而致表面硬度下降,形成软点,同时基体组织存在严重的带状分布进一步加剧了内部应力。在腐蚀性环境中,工件长期承受交变载荷,导致腐蚀裂纹源的产生,并逐步扩展,最终引发断裂失效。

关键词: 抽油杆, 脱碳层, 硬度, 腐蚀应力

Abstract: Cause of the fracture failure of a 30CrMnSiNi2A steel sucker rod was analyzed by means of macroscopic observation, metallographic examination, chemical composition and fracture analysis and hardness testing. The results indicate that the failure cause of the sucker rod is the decrease of surface hardness due to decarburization, leading to the formation of soft spots in the surface. Additionally, severe banded distribution in the matrix further intensifies internal stresses. Under a corrosive environment, the rod is subjected to cycled loads over a long period, which facilitates the initiation and progressive propagation of corrosion fatigue cracks, ultimately resulting in the fracture failure.

Key words: sucker rod, decarburized layer, hardness, corrosion stress

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