Impeder for manufacturing welded pipe

B - Operations – Transporting – 23 – K

Patent

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Details

B23K 13/08 (2006.01) B23K 13/02 (2006.01) H05B 6/10 (2006.01)

Patent

CA 2448503

An impeder for manufacturing a welded pipe which has an insulating case (4) and, housed therein, a laminate (10) of coated steel sheets (8) each having a steel sheet having a thickness of 0.3 mm or less and, formed on the surface thereof, an insulating coating film, characterized in that the steel sheet contains 1.5 to 20 % of Cr and 2.5 to 10 % of Si, has a total content of C and N of 100 ppm or less, contains one or more of Al, Mn and P in amounts of 5 % or less, 1 % or less and 1 % or less, respectively, the balance of the steel being Fe and inevitable impurities, and preferably the steel sheet has a resistivity of 60 µ.OMEGA. .cndot. cm or more.

Dispositif inhibiteur permettant de fabriquer un tube soudé, qui possède un boîtier isolant (4), un plaqué (10) de feuilles d'acier (8) dotées d'un revêtement logé dans le boîtier, chaque feuille d'acier ayant une épaisseur de 0,3 mm ou moins et un film de revêtement isolant formé sur la surface de ladite feuille. Selon la présente invention, la feuille d'acier contient 1,5 à 20 % de Cr et 2,5 à 10 % de Si, possède une teneur totale de C et de N de 100 ppm ou moins, contient une ou plusieurs des substances du groupe constitué par Al, Mn et P dans des quantités respectivement de 5 % ou moins, 1 % ou moins et 1 % ou moins, le solde étant constitué par Fe et les impuretés inévitables. Ladite feuille d'acier possède de préférence une résistivité de 60 µ.OMEGA.cm ou plus.

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