对3Cr油管体骨折的故障分析
Jinzhi Wang1, Yan Li2, Xianren Kuang3
1Tubular Goods Research Institute, China National Petroleum Corporation & State Key Laboratory of Service Behavior and Structural Safety of Petroleum Pipe and Equipment Materials, Xi'an, 710077, China. swawjz@qq.com.
Scientific reports
|July 17, 2025
概括
3Cr修复的油管的断裂是由应力腐蚀裂纹引起的. 这是由于注入气体和形成水中的腐蚀性元素造成的,导致轴承负载下容量减少和塑料故障.
科学领域:
- 材料科学 材料科学 材料科学
- 腐蚀工程 腐蚀工程
- 石油工程是石油工程中的一个.
背景情况:
- 修复后的油管越来越多地用于石油和天然气运输.
- 制造和维修标准的差异可能会导致服务问题.
- 3Cr修复的油管中发生的断裂事故促使了这项调查.
研究的目的:
- 为了确定3Cr修复的油管体骨折的根本原因.
- 分析破裂油管的材料特性和故障机制.
- 评估导致故障的环境因素.
主要方法:
- 宏观形态学的分析.
- 磁性颗粒探测仪 磁性颗粒探测仪
- 化学成分分析 化学成分分析
- 机械性能测试 (拉力强度,率强度,硬度) 的测试.
- 金属学分析的方法
- 扫描电子显微镜 (SEM) 的使用
- 能源频谱分析 能源频谱分析
- 腐蚀产品X射线衍射 (XRD) 分析分析
主要成果:
- 材料性能 (抗拉强度,度强度,硬度,化学成分) 符合3Cr低合金钢的技术协议.
- 金属学分析显示,钢化索伊尼特的颗粒大小为9.0等级.
- 发现了腐蚀性环境:气体提升中的氧和H2S,以及化形成的水.
- 油管体上存在腐蚀坑和应力腐蚀裂.
结论:
- 3Cr修复的油管材料符合规格,但使用环境导致故障.
- 腐蚀性元素和高应力组合创造了一个应力腐蚀裂变 (SCC) 敏感的环境.
- SCC和腐蚀坑降低了油管的承载能力,导致轴承负载下的塑料断裂.
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