Steel product for use as line pipe having high hic...

Details Steel product for use as line pipe having high hic... Steel product for use as line pipe having high hic...

C - Chemistry, Metallurgy

22

C

C22C 38/00 (2006.01) C22C 38/14 (2006.01) C22C 38/58 (2006.01)

Patent

CA 2555078

A steel product for a line pipe according to the invention has a composition containing, in mass %, C : 0.03% to 0.15%, Si : 0.05% to 1.0%, Mn : 0.5% to 1.8%, P : 0.015% or less, S: 0.004% or less, O : 0.01% or less, N: 0.007% or less, sol. Al :0.01% to 0.1%, Ti :0.024% or less, Ca : 0.0003% to 0.02%, and the balance consisting of Fe and impurities. The size of TiN in the steel product for a line pipe is at most 30 µm. The steel product has high HIC resistance and its crack area ratio can be reduced to 3% or less.

Produit d'acier pour tuyau d'oléoduc, dont la composition chimique est la suivante, en pourcentage de masse C: 0,03 à 0,15 %, Si: 0,05 à 1.0 %, Mn; 0,5 à 1,8 %, P: 0,015 % ou moins, S: 0,004 % ou moins, O: 0,01 % ou moins, N: 0,007 % ou moins, Sol.Al: 0,01 à 0,1 %, Ti: 0,024 % ou moins, Ca: 0,0003 à 0,02 %, et le reste : Fe et impuretés, caractérisé en ce que le TiN présent dans le produit d'acier comme inclusion a une taille de 30 µm ou moins. Le produit d'acier ci-dessus pour tuyau d'oléoduc a une résistance HIC si élevée qu'il présente un rapport de zone craquelée de 3 % ou moins dans un test HIC indiqué dans la spécification.

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