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Near Neutral pH SCC of Grade X80 Linepipe Steels Under Cyclic Loading

[+] Author Affiliations
Nobuyuki Ishikawa, Mitsuo Kimura

JFE Steel Corporation, Okayama, Japan

Hitoshi Asahi, Mitsuru Sawamura

Nippon Steel Corporation, Chiba, Japan

Tomohiko Omura, Hirofumi Kishikawa

Sumitomo Metal Industries, Ltd., Okayama, Japan

Paper No. IPC2008-64281, pp. 431-437; 7 pages
doi:10.1115/IPC2008-64281
From:
  • 2008 7th International Pipeline Conference
  • 2008 7th International Pipeline Conference, Volume 2
  • Calgary, Alberta, Canada, September 29–October 3, 2008
  • Conference Sponsors: International Petroleum Technology Institute and the Pipeline Division
  • ISBN: 978-0-7918-4858-6 | eISBN: 798-0-7918-3835-8
  • Copyright © 2008 by ASME

abstract

Susceptibility to stress corrosion cracking (SCC) of Grade X80 linepipe steels, which were produced by recent TMCP (Thermo-Mechanical Controlled Processing) technique, controlled rolling (CR) followed by accelerated cooling process (ACC), in near neutral pH conditions was investigated, and cracking behavior was compared with conventional Grade X65 linepipe. Longitudinal strip specimens with small surface notches were cyclically loaded in the NS4 solution with cathodic polarization of −1000mV vs. SCE. No significant difference in susceptibility to SCC was found between Grades X80 and X65 linepipes, both produced by TMCP process, even under higher stress condition for X80 linepipe steel. Hydrogen permeation test reviled the strong effect of hydrogen for the cracking under the SCC test condition. Transgranular cracking and quasi-cleavage fracture were observed as an evidence of the effect of both corrosion and hydrogen embrittlement on near neutral pH SCC.

Copyright © 2008 by ASME
Topics: Steel

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