C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
C21D 7/06 (2006.01) C22C 38/04 (2006.01)
Patent
CA 2259241
Steel which has an excellent outer surface SCC resistance for pipelines without deteriorating fundamental requirements as the pipeline material. The surface smoothness of the steel is so controlled as to have a centerline average roughness Ra 7 µm and have a maximum height Rmax 50 µm. This surface smoothness is obtained by applying shot-blast to the surface.
Cette invention se rapporte à un acier qui possède une excellente résistance de surface latérale SCC pour canalisations, sans que les exigences fondamentales concernant le matériau de la canalisation ne soient compromises. Le lissé de surface de l'acier est régulé de façon à produire une rugosité moyenne d'axe Ra ? 7 µm et une hauteur maximum Rmax ? 50 µm. On obtient ce lissé de surface en appliquant à la surface de l'acier une operation de grenaillage.
Asahi Hitoshi
Fukai Hideaki
Kushida Takahiro
Okano Shigeo
Yamane Yasuyoshi
Goudreau Gage Dubuc
Kabushiki Kaisha Kobe Seiko Sho
Kawasaki Steel Corporation
Nippon Steel Corporation
Nkk Corporation
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