Saw Welded Joints of Two API Steels Subject to SCC Laboratory Testing
Many steels tubes used in the Oil Industry are constantly exposed to hydrogen sulphide (H2S) which can lead to the diffusion of hydrogen into the steel, potentially provoking hydrogen embrittlement and/or stress corrosion cracking. Additionally the critical region in pipelines is usually considered to be the welded joints. In this work SAW welded joints of two API steels, grades X80 and X70, were evaluated using laboratory tests according to the NACE TM0177/96 METHOD A Standard and the slow strain rate test (SSRT) using a sodium thiosulphate solution. The results indicate that both steel grades can be susceptible to HE and SCC, since loss of ductility when submitted to SSRT and failure under NACE TM0177/96 METHOD A were observed.
T. Chandra, K. Tsuzaki, M. Militzer , C. Ravindran
F. A. Martins et al., "Saw Welded Joints of Two API Steels Subject to SCC Laboratory Testing", Materials Science Forum, Vols. 539-543, pp. 4440-4445, 2007