Failure analysis of 20 steel equal-diameter tee

doi:10.13251/j.issn.0254-6051.2022.02.046

Abstract

Abstract: Failure causes of failed 20 steel equal-diameter tee used in a metering skid were investigated through the fracture analysis, chemical composition analysis, microstructure analysis, Brinell hardness and electrochemical corrosion test combining with the manufacture process of the tee. The results show that the tee made of 20 steel seamless pipe by hydraulic cold expansion forming process does not meet the standard requirements of normalizing or annealing treatment. The embrittlement caused by work hardening is not eliminated, which leads to the reduction of defect tolerance of the tee, and then the brittle fracture. Moreover, the electrochemical corrosion properties of the failed tee decline clearly due to the cold deformation, and the corrosion of inner wall of the tee is aggravated, and then the corrosion pit on inner wall of the tee becomes the crack source of brittle fracture. It is recommended to enhance the quality supervision and ex-factory inspection of the tee.

Key words: 20 steel equal-diameter tee, brittle fracture, corrosion resistance

CLC Number:

TG142.3

Li Dejun, Gao Hua, Kong Xianglu, Yang Xiaoping, Li Ta, Dong Zhaoyuan, Zhang Xiaojia. Failure analysis of 20 steel equal-diameter tee[J]. Heat Treatment of Metals, 2022, 47(2): 262-266.

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