Steel for CT80 grade coiled tubing, and manufacturing method and use thereof

A manufacturing method and oil pipe technology, applied in the direction of drill pipe, casing, temperature control, etc., can solve the problems of incomparability, etc., and achieve the effects of low carbon equivalent, good plasticity, and good welding performance

Inactive Publication Date: 2009-01-28
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Other patents on coiled tubing are mainly related to op

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The chemical composition (Wt%) of steel for coiled tubing in this example is C: 0.04, Mn: 1.92, Si: 0.25, S: 0.0016, P: 0.009, Nb: 0.128, Ti: 0.016, Cr: 0.62, Ca: 0.0023, al t : 0.035, V: 0.06, N: 0.006, O: 0.002, H: 0.0002, the balance is Fe and unavoidable inclusions. Ceq is 0.496.

[0040] Steel for coiled tubing is obtained after a series of processes of smelting, casting, slab reheating, controlled rolling, cooling and coiling. The main process parameters are as follows (1) slab heating temperature: 1200°C; (2) waiting temperature range: 1050~950°C; (3) final rolling temperature: 850°C; (4) coiling temperature control: 580°C ; (5) Cooling rate range: 12~17℃ / s.

[0041] After testing, the mechanical performance results of steel for coiled tubing in this embodiment are as follows: R t0.5 MPa: 618, 621; R m MPa: 750, 762; A 50.8 %: 21.5, 20.5; HRC: 19.8, 21.0.

Embodiment 2

[0043] The chemical composition (Wt%) of steel for coiled tubing in this embodiment is C: 0.08, Mn: 1.40, Si: 0.25, S: 0.0030, P: 0.009, Nb: 0.07, Ti: 0.01, Cu: 0.25, Ni: 0.15, Cr: 0.31, Ca: 0.0015, Al t : 0.02, V: 0.09, N: 0.004, O: 0.002, H: 0.0003, the balance is Fe and unavoidable inclusions. Ceq is 0.420.

[0044] The manufacturing method of steel for coiled tubing is the same as in Example 1.

[0045] After testing, the mechanical performance results of steel for coiled tubing in this embodiment are as follows: R t0.5 MPa: 572, 560; R m MPa: 650, 630; A 50.8 %: 28.0, 29.4; HRC: 12.4, 13.0.

Embodiment 3

[0047] The chemical composition (wt%) of steel for coiled tubing in this example is C: 0.23, Mn: 0.70, Si: 0.30, S: 0.0020, P: 0.012, Nb: 0.06, Ti: 0.02, Cr: 0.5, Ca: 0.003, Al t : 0.04, V: 0.07, N: 0.004, O: 0.003, H: 0.0003, the balance is Fe and unavoidable inclusions. Ceq is 0.461.

[0048] The manufacturing method of steel for coiled tubing is the same as in Example 1.

[0049] After testing, the mechanical performance results of steel for coiled tubing in this embodiment are as follows: R t0.5 MPa: 573, 580; R m MPa: 662, 668; A 50.8 %: 26.0, 26.5; HRC: 15.6, 16.0.

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PUM

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Abstract

The invention provides a steel used for a CT80 coiled tubing, the chemical compositions of which by weight percentage are as follows: 0.04 percent to 0.25 percent of C, 0.10 percent to 0.60 percent of Si, 0.50 percent to 2.0 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.050 percent of S, 0.30 percent to 1.50 percent of Cr, 0.02 percent to 0.13 percent of Nb, 0.01 percent to 0.10 percent of Ti, 0.01 percent to 0.10 percent of V, less than or equal to 0.30 percent of Mo, less than or equal to 0.30 percent of Cu, less than or equal to 0.30 percent of Ni and 0.01 percent to 0.05 percent of Al, and the rest are Fe and other unavoidable impurities. The invention also provides a manufacturing method and the application of the steel. The steel used for the CT80 coiled tubing of the invention has yield strength up to 80Kpsi (kilopond per square inch) and better plasticity. The manufacturing method of the invention is simple and easy to be implemented.

Description

technical field [0001] The invention relates to a CT80 steel for coiled tubing and a manufacturing method and application of CT80 steel for coiled tubing. Background technique [0002] Coiled Tubing (CT for short) is relative to conventional threaded tubing, and it is also called coiled tubing, serpentine tubing or coiled tubing. It is a long unthreaded oil pipe that is wound on the drum and can be continuously lowered or pulled out from the oil well. Coiled tubing materials mainly include carbon steel, quenched and tempered steel, and rare materials. Among them, rare materials, such as titanium alloy, have the advantages of light weight and high strength, but the price is 6 times that of ordinary steel coiled tubing. [0003] Since the world's first coiled tubing machine came out in 1962 and began to be used in the oil industry, after more than 40 years of development, coiled tubing has become a hot spot in the world's oil and gas industry technology research and applicati...

Claims

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Application Information

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IPC IPC(8): C22C38/28C22C38/38C22C38/50C22C38/58B21B37/74E21B17/00
Inventor 章传国郑磊高珊
Owner BAOSHAN IRON & STEEL CO LTD
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