Premium
Test method for the investigation of the susceptibility to cracking in near neutral pH solution
Author(s) -
Evertz Thomas,
Flaxa Volker,
Eichholz Hellfried
Publication year - 1999
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199905623
Subject(s) - stress corrosion cracking , chemistry , metallurgy , materials science , composite material , corrosion
Susceptibility of steel pipes to cracking in near neutral solution is a relatively new observed kind of stress corrosion cracking (SCC) in pipelines. The corrosion conditions are different from the well known alkali SCC. A qualified test method for steel in near neutral solution with simulated loading conditions for pipelines was not available and had to be developed. A special test equipment consists of a twin constant elongation rate tension (CERT) machine combined with a container for the fluid drive. A data collector was successfully developed. Tests with steel grade API 5L X 65 and the results are described in this paper. Loading conditions ranged from short to long saw‐tooth cycles between 70 and 90% of the proof stress. Cracks with depths up to 40 μm were observed after the 60‐day testing period.