High-strength large-diameter UOE line pipes over X70 grade are difficult to apply to actual fields, including H2S, because of a deterioration of sour resistance and a lack of past performance. However, API X70 grade large-diameter UOE line pipes for sour service have been manufactured stably by optimizing the continuous casting process, controlling the shape of inclusions and decreasing coarse precipitates. A full-ring test can simulate fairly well the actual applied conditions of line pipes and evaluate hydrogen induced cracking (HIC), sulfide stress cracking (SSC) and stress oriented hydrogen induced cracking (SOHIC) of line pipes for sour service simultaneously. It was confirmed that the X70 grade UOE line pipes have a good sour resistance from standard HIC tests, four-point bent beam SSC tests and the full-ring test including a seam weld under severe sour conditions (NACE solution A with 0.1 MPa H2S). In addition, the SSC resistance of a girth welded portion was also investigated by using simulated HAZ.
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2012 9th International Pipeline Conference
September 24–28, 2012
Calgary, Alberta, Canada
Conference Sponsors:
- International Petroleum Technology Institute
- Pipeline Division
ISBN:
978-0-7918-4514-1
PROCEEDINGS PAPER
Full Ring Evaluation of X70 Grade UOE Line Pipes for Sour Service
Kenji Kobayashi,
Kenji Kobayashi
Sumitomo Metal Industries, Ltd., Amagasaki, Japan
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Tomohiko Omura,
Tomohiko Omura
Sumitomo Metal Industries, Ltd., Amagasaki, Japan
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Masahiko Hamada,
Masahiko Hamada
Sumitomo Metal Industries, Ltd., Amagasaki, Japan
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Hiroyuki Nagayama,
Hiroyuki Nagayama
Sumitomo Metal Industries, Ltd., Amagasaki, Japan
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Izuru Minato,
Izuru Minato
Sumitomo Metal Industries, Ltd., Kashima, Japan
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Yuki Nishi
Yuki Nishi
Sumitomo Metal Industries, Ltd., Kashima, Japan
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Kenji Kobayashi
Sumitomo Metal Industries, Ltd., Amagasaki, Japan
Tomohiko Omura
Sumitomo Metal Industries, Ltd., Amagasaki, Japan
Masahiko Hamada
Sumitomo Metal Industries, Ltd., Amagasaki, Japan
Hiroyuki Nagayama
Sumitomo Metal Industries, Ltd., Amagasaki, Japan
Izuru Minato
Sumitomo Metal Industries, Ltd., Kashima, Japan
Yuki Nishi
Sumitomo Metal Industries, Ltd., Kashima, Japan
Paper No:
IPC2012-90417, pp. 421-428; 8 pages
Published Online:
July 25, 2013
Citation
Kobayashi, K, Omura, T, Hamada, M, Nagayama, H, Minato, I, & Nishi, Y. "Full Ring Evaluation of X70 Grade UOE Line Pipes for Sour Service." Proceedings of the 2012 9th International Pipeline Conference. Volume 3: Materials and Joining. Calgary, Alberta, Canada. September 24–28, 2012. pp. 421-428. ASME. https://doi.org/10.1115/IPC2012-90417
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