Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...
Reexamination Certificate
2007-07-03
2007-07-03
Lavilla, Michael E. (Department: 1775)
Stock material or miscellaneous articles
All metal or with adjacent metals
Composite; i.e., plural, adjacent, spatially distinct metal...
C428S034100, C428S632000, C138S142000, C138S143000, C148S325000, C148S590000, C148S592000
Reexamination Certificate
active
11366442
ABSTRACT:
This invention relates to a welded line pipe structure for transporting corrosive petroleum or natural gas. It is constituted by martensitic stainless steel pipes containing 8–16% Cr and at most 0.05% C. By suitably controlling the welding conditions at the time of girth welding of the steel pipes so as to ensure that the Cr concentration in grain boundary Cr-depleted portions existing immediately beneath a weld oxide scale is at least 5%, the occurrence of SCC in a high temperature CO2environment can be prevented.
REFERENCES:
patent: 5275893 (1994-01-01), Miyasaki et al.
patent: 07-179943 (1995-07-01), None
patent: 08-132238 (1996-05-01), None
patent: 11-291084 (1999-10-01), None
patent: 2000-015447 (2000-01-01), None
M. Ueda et al., “Corrosion Resistance of Weldable Super 13CR Stainless Steel in H2S Containing CO2Environments”, Corrosion 96—The NACE International Annual Conference and Exposition, Paper No. 58, copyright 1996, no month.
Amaya Hisashi
Hirata Hiroyuki
Kondo Kunio
Ogawa Kazuhiro
Sagara Masayuki
Clark & Brody
Lavilla Michael E.
Sumitomo Metal Industries Ltd.
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