Saw Welded Joints of Two API Steels Subject to SCC Laboratory Testing


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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.



Materials Science Forum (Volumes 539-543)

Main Theme:

Edited by:

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

Online since:

March 2007




[1] J. K. Patel, A brief report on the influencing factors on SCC in buried pipelines, Germany: Niobium Products Company GmbH (NPC), January (2001).

[2] Nace International, Laboratory testing of metals for resistance to specific forms of environmental cracking in H2S environments. NACE Standard TM0177/96. Standard Test Method. Texas, December (1996).

[3] H.F. Lopez, R. Bharadwaj, J.L. Albarran, L. Martinez, Metall. Mater. Trans. A, vol 30A(1999), p.2419.

[4] G. M Omweg, G. S. Frankel, W. A. Bruce, J. E. Ramirez, G. Koch, Welding Research, (2003)pp 136s.

[5] M. C. Zhao, B. Tang, Y. Y. Shan, , K Yang, Metallurgical and Materials Transactions A, vol 34A (2003), p.1089.

[6] NACE MR0175 Materials Equipament Standard - Sulfide Stress Cracking Resistant Metallic Materials for Oilfield Equipament, Houston, Texas.

[7] R.D. Kane, International Metals Reviews, vol30 (1985), No. 6, p.291.

[8] K. R. de S. Lima, I. de S. Bott, J. A. Ponciano Gomes, International Conference on Offshore Mechanics and Arctic Engineering (OMAE 2005), CDROM.