A use of a steel pipe for embedding-expanding as an oil well...

C - Chemistry – Metallurgy – 22 – C

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C22C 38/00 (2006.01) C22C 38/06 (2006.01) C22C 38/58 (2006.01)

Patent

CA 2527117

An oil well steel pipe to be placed under the ground and be expanded, which comprises a steel having a chemical composition in mass % that C: 0.05 to 0.45 %, Si: 0.1 to 1.5 %, Mn: 0.1 to 3.0 %, P: 0.03 % or less, S: 0.01 % or less, sol Al: 0.05 % or less, and the balance: Fe and impurities, with the proviso that the amount of N forming a solid solution in the steel is 40 ppm or less. The steel may also contain one or more of specific amounts of V, Ti, Nb, B, Cr, Mo, Ni, Cu and Ca in addition to the above composition. The oil well steel pipe is excellent in the resistance to the sulfide stress cracking after being expanded.

La présente invention concerne un tuyaux d'acier de puits de pétrole destiné à être placé sous terre et à être expansé, qui comprend un acier possédant une composition chimique suivante: de 0,005% à 0,45% en masse de C, de 0,1% à 1,5% en masse de Si, de 0,1% à 3,0% en masse de Mn, 0,03% en masse de P au maximum, 0,01% en masse de S au maximum, 0,05% au maximum de sol Al et le solde en Fe et en impuretés sous réserve que la quantité de N formant une solution solide dans l'acier soit de 40ppm au maximum. Cet acier peut aussi contenir une quantité d'un ou de plusieurs de ces éléments spécifiques: V, Ti, Nb, B, Cr, Mo, Ni, Cu et Ca en plus de la composition susmentionnée. Ce tuyau d'acier de puits de pétrole à cède une excellente résistance à la fissuration du sulfure après expansion.

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