Cracking analysis of a newly built gas transmission steel pipe

被引：3

作者：

Ding, H. ^{[1
,2
,3
]}

Qi, D. T. ^{[1
,2
]}

Qi, G. Q. ^{[1
,2
,3
]}

Wei, B. ^{[1
,2
]}

Ding, N. ^{[1
,2
]}

Li, H. B. ^{[1
,2
]}

Wang, F. S. ^{[4
]}

Yan, Z. F. ^{[4
]}

Feng, Q. ^{[4
]}

Zhang, Z. H. ^{[5
]}

Sun, Y. J. ^{[5
]}

机构：

[1] China Natl Petr Corp, Tubular Goods Res Inst, Xian 710065, Shaanxi, Peoples R China

[2] State Key Lab Performance & Struct Safety Petr Tu, Xian 710065, Shaanxi, Peoples R China

[3] Northwestern Polytech Univ, Sch Sci, Dept Appl Chem, Xian 710072, Peoples R China

[4] PetroChina Co Ltd, Tarim Oilfield Co, Korla 841000, Peoples R China

[5] Xian Changqing Technol Engn Co Ltd, Xian 710018, Shaanxi, Peoples R China

来源：

ENGINEERING FAILURE ANALYSIS | 2020年 / 118卷

关键词：

Steel pipe; Cracking; Welding seam; Slag inclusion; STRESS-CORROSION CRACKING; BEHAVIOR; SUSCEPTIBILITY; RESISTANCE;

D O I：

10.1016/j.engfailanal.2020.104868

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

A longitudinal crack was found in the welding seam during the X-ray inspection of a newly built L245NS gas transmission pipeline in China western oilfield. The crack causes were analyzed by the nondestructive tester (NDT), direct-reading spectrometer, tensile strength test machine, impact test machine, Vickers hardness tester, optical microscope (OM), macroscopic fracture morphology, scanning electron microscopy (SEM) and energy spectrum analysis(EDS) in this paper. The results show that the crack is caused by the original defect. First, the fracture surface of the crack is characterized by multi-source cracking, and the origin of the crack is containing foreign matters. Second, the surface of crack fracture is blue, which indicates that the crack fracture has experienced high-temperature burning, so the crack may be formed before heat treatment. The main reason for steel pipe crack is the low stress cracking at the pipe end by the "slag inclusion" formed in the pipe body when the pipe is processing.

引用

页数：8

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