A rare earth-containing tc-50 steel grade petroleum tube blank

Abstract

The invention provides a rare earth-containing TC-50 steel grade petroleum pipe blank, which is composed of the following chemical components in mass percentage: C 0.28-0.32%; Si 0.15-0.30%; Mn 1.45-1.60%; P≤0.018%; S≤0.008%; Cr 0.15‑0.25%; Al 0.015‑0.040%; Ce 0.0005‑0.0020%; Ni<0.10%; Cu<0.10%; the balance is Fe and impurities. A kind of production method of TC-50 steel grade oil pipe blank containing rare earth, produces a kind of TC-50 steel grade petroleum pipe blank containing rare earth, a kind of TC-50 steel grade oil casing pipe containing rare earth, uses a kind of Made of rare earth TC‑50 steel grade petroleum pipe blanks. The invention discloses a production method of a rare earth-containing TC-50 steel grade oil casing, and produces a rare earth-containing TC-50 steel grade oil casing. The beneficial effects of the invention are: high tensile strength, high yield strength and high transverse impact resistance.

Description

technical field [0001] The invention relates to the production of oil casing pipes, in particular to a rare earth-containing TC-50 steel grade oil pipe blank. Background technique [0002] TC-50 steel grade oil casing is a high value-added product, usually used for medium-depth oil and gas wells of about 3000 meters, and can also be used for heavy oil thermal recovery wells of about 2000 meters, mainly as technical casing and surface casing use. With the continuous increase of oil and gas drilling and production in various countries in the world, the J55 steel grade oil casing cannot meet the drilling and production needs, and the N80 steel grade oil casing has the disadvantage of high cost and is not economical. [0003] For example, a kind of 80ksi steel grade straight seam welded oil casing steel disclosed in Chinese patent CN101376943A uses C, Si, Mn, Al, excess Fe and other components to obtain a coil with a yield strength of 600-645MPa through a straight seam welding ...

AI Technical Summary

Problems solved by technology

Although achieved 200J / cm at 0°C 2 Level of lateral impact value, but need to add Ca as cost, and 200J / cm 2 It has far exceeded the technical requirements. For the general formation structure, it is not necessary to spend the cost of Ca addition to increase the lateral impact value to such a high level as 200J / cm2

Images