Evaluation of HIC/SSCC Resistance for API-X70 Pipe Manufactured by JCO Bending Process and SA Welding

Ryoo, Hoi-Soo; Kim, Hee Jin; Lee, Dong-Eon

doi:2014.32.5.431

J Weld Join > Volume 32(5); 2014 > Article

Special Issue

Journal of Welding and Joining 2014;32(5):431-436.
DOI: https://doi.org/10.5781/JWJ.2014.32.5.1 Published online October 30, 2014.

Evaluation of HIC/SSCC Resistance for API-X70 Pipe Manufactured by JCO Bending Process and SA Welding

Hoi-Soo Ryoo^*, Hee Jin Kim^*, Dong-Eon Lee^**

Correspondence: Hoi-Soo Ryoo,
Email: hsryoo@kitech.re.kr

Abstract

This study aims at manufacturing SA welded API-X70 line-pipe with sour gas resistance. A pipe was manufactured by JCO bending process and SA welding using the API-X70 plate guaranteed HIC resistance. SA welded pipe was expanded in order to reduce the residual stress. The evaluation of a pipe for resistance to HIC and SSCC were performed by the RS D 0004 and RS D 0005 standards. For verification that a pipe has acceptable resistance to HIC, fullscale test was carried out. Results showed no cracking for the HIC and SSCC.

Key Words: API-X70, JCO(J-ring, C-ring, O-ring) bending, SAW(submerged arc welding), HIC(hydrogen induced cracking), SSCC(sulfide stress corrosion cracking), Fullscale HIC test