Hot-rolled coil plate for oil casing and manufacturing method thereof

A technology for oil casing and a manufacturing method, which is applied in the field of hot-rolled coil for oil casing and its manufacturing, and can solve the problems of high carbon content and affecting welding performance, etc.

Inactive Publication Date: 2012-10-10
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016]2) Chinese patent, application number 200910048199.4, application publication number CN 1O1845583A, "Steel for oil casing and its manufacturing method"; C content is 0.31-0.35%, and Selectively add Mo0.05-0.35%. Compa

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  • Hot-rolled coil plate for oil casing and manufacturing method thereof

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Embodiment Construction

[0107] The specific embodiment of the present invention is described in detail below in conjunction with embodiment, but specific embodiment of the present invention is not limited to following embodiment

[0108] Embodiment 1 of hot-rolled coil

[0109] The technical features of the coiled plate of the present invention will be described in detail below with this embodiment. The mass percent of the chemical composition of the hot-rolled coil for oil casing pipe (K55 steel grade) in this embodiment is:

[0110] C: 0.18 Si: 0.195 Mn: 1.26 P: 0.011 S: 0.002 Al: 0.018

[0111] Nb: 0.018 Ti: 0.014

[0112] The balance is Fe and unavoidable impurity elements.

[0113] The coiled plate of this embodiment has a thickness of 12.2mm, a width of 1600mm, and a length of 193.6m.

[0114] Its tensile strength Rm=715Mpa, yield strength is Rt 0.5 =465Mpa, the yield ratio is 0.65, which meets the performance requirements of K55 oil casing for hot-rolled strip steel.

[0115] Embodim...

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Abstract

The invention relates to a hot-rolled coil plate for an oil casing and a manufacturing method thereof. The hot-rolled coil plate comprise, by mass percent, 0.10 to 0.21 of C, 0.10 to 0.25 of Si, 1.0 to 1.50 of Mi, 0.010 to 0.020 of Al, less than or equal to 0.020 of P, no more than 0.010 of S, 0,012 to 0.045 of Nb, 0.005 to 0.020 of Ti, and the balance Fe and inevitable impurities. The tensile strength Rm is more than or equal to 655Mpa, the yield strength Rt 0.5 is 379-552Mpa, the elongation A50% is more than or equal to 24, and the hardness HV10 is less or equal to 248. The manufacturing method includes:LF refining, the S being less than or equal to 0.004%; RH refining, subjecting the molten steel to Ca treatment; slab continuous casting, the temperature being in a range from 1527 DEG C to 1547 DEG C, and the casting speed being less than or equal to 1.2m/min; slab heating, the temperature being in a range from 1150 DEG C to 1230 DEG C; roughing mill group rolling, the final temperature being in a range from 750 DEG C to 920 DEG C; laminar cooling; and coiling. The hot-rolled coil plate for the oil casing has low yield ratio and good welding performances, and no subsequent thermal treatment is needed.

Description

technical field [0001] The invention relates to a hot-rolled coil for oil casing and a manufacturing method thereof, that is, a hot-rolled coil for oil casing of K55 steel grade and a manufacturing method thereof. Background technique [0002] Oil casing is the lifeline to keep oil well running. It is mainly used to support the well wall during drilling and after completion, so as to ensure the drilling process and the normal operation of the entire oil well after completion. Due to different geological conditions, the downhole stress state is complex, and the tensile, compressive, bending and torsional stresses act comprehensively on the pipe body, which puts forward higher requirements on the quality of the casing itself. Once the casing itself is damaged for some reason, It may lead to the reduction of production of the entire well, or even scrapping. [0003] According to the strength of the steel itself, the casing can be divided into different steel grades, namely J5...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21D8/02C21D11/00
Inventor 胡松涛崔天燮王育田薛文广张彥睿边育秀
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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