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Fracture Stages and Residual Strength of Pipe Steel after Long-Term Operation
Physical Mesomechanics ( IF 1.6 ) Pub Date : 2021-08-02 , DOI: 10.1134/s1029959921040123
L. R. Botvina 1 , M. R. Tyutin 1 , V. P. Levin 1, 2 , A. E. Morozov 1 , A. I. Bolotnikov 1, 2 , V. M. Kushnarenko 3
Affiliation  

Abstract

The paper investigates the mechanical and physical properties of low-carbon pipe steel (analog of steel 20 corresponding to TU-28-FR-73) after 39 years of service life in a crude gas pipeline at the Orenburg oil and gas condensate field. It is shown that the standard mechanical properties of the gas pipeline steel after long-term operation correspond to the TU-28-FR-73 standard. The effect of preliminary cyclic loading on the residual tensile strength of steel, the acoustic emission characteristics, and the residual magnetic field intensity estimated by the metal magnetic memory method is studied. After preliminary cycling, the steel was hardened and the acoustic regime changed due to damage accumulation. Four stages of damage evolution in the tensile steel are identified both before and after preliminary cyclic loading, and informative diagnostic criteria for the stages are proposed. Relationships are derived to relate the relative number of preloading cycles with the cumulative acoustic count, acoustic activity, slope of cumulative count-strain curves, acoustic gap duration, and residual magnetic field intensity. The listed characteristics are shown to be promising as diagnostic criteria for the state of the material.



中文翻译:

管钢长期运行后的断裂阶段及残余强度

摘要

本文研究了低碳管道钢(TU-28-FR-73 对应的钢 20 的类似物)在奥伦堡油气凝析油田的原油管道中使用 39 年后的力学和物理性能。结果表明,燃气管道钢长期运行后的标准力学性能符合TU-28-FR-73标准。研究了预循环载荷对钢残余抗拉强度、声发射特性和金属磁记忆法估计残余磁场强度的影响。初步循环后,钢变硬,由于损伤累积,声学状态发生了变化。在初步循环加载之前和之后确定了拉伸钢中损伤演变的四个阶段,并提出了各阶段的信息性诊断标准。推导出关系以将预加载循环的相对数量与累积声计数、声活动、累积计数-应变曲线的斜率、声隙持续时间和剩余磁场强度相关联。列出的特征被证明有希望作为材料状态的诊断标准。

更新日期:2021-08-03
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