Uoe steel pipe and a method for its manufacture

B - Operations – Transporting – 23 – K

Patent

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Details

B23K 9/23 (2006.01) B21C 37/08 (2006.01) B23K 9/025 (2006.01) B23K 9/235 (2006.01) B23K 35/30 (2006.01) C22C 38/00 (2006.01) C22C 38/58 (2006.01)

Patent

CA 2688062

Disclosed is an UOE steel pipe which does not cause the delayed hydrogen cracking at a welded part or the fracture of the pipe during the pipe-expanding process, has excellent toughness at a welded part and a heat-affected part, and has a tensile strength of 900 MPa or greater. The tensile strength of a welded part formed on a base material having a tensile strength of 900 MPa or greater is adjusted to 95 to 110% relative to the tensile strength of the base material. The oxygen content in weld metal of the welded part is 0.035 mass% or less. The welded part is pre-heated at 75 to 250~C before the welding of an exterior surface of the pipe is conducted.

L'invention concerne un tuyau en acier UOE qui ne provoque pas la fissuration par hydrogène retardée au niveau d'une partie soudée ou la fracture du tuyau pendant le procédé d'élargissement de tuyau, qui a une excellente ténacité au niveau d'une partie soudée et d'une partie affectée thermiquement et qui a une résistance à la traction de 900 MPa ou plus. La résistance à la traction d'une partie soudée formée sur un matériau de base ayant la résistance à la traction de 900 MPa ou plus est ajustée à 95 à 110% par rapport à la résistance à la traction du matériau de base. La teneur en oxygène du métal d'apport de la partie soudée est de 0,035% en masse ou moins. La partie soudée est préchauffée à 75 à 250°C avant que le soudage d'une surface extérieure du tuyau ne soit conduit.

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