| 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** |
*Korea Institute of Industrial Technology, Advanced Welding & Joining R&D Group, Incheon 406-640, Korea
**SeAH Steel Corp., Quality Management Team New Material Research Part, Pohang 790-240, Korea |
Correspondence:
Hoi-Soo Ryoo Email: hsryoo@kitech.re.kr
Published online October 30, 2014
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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. |
| Keywords:
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
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