High-strength seamless line pipe and manufacturing method thereof

A seamless line pipe and high-strength technology is applied in the field of high-strength seamless line pipe and its preparation. The effect of stability

Active Publication Date: 2021-07-13
DALIPAL PIPE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of high content of alloy elements in existing high-strength seamless line pipes and the lack of effective on-line microstructure and performance control means in the rolling process, the present invention provides a high-strength seamless line pipe and its preparation method

Method used

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  • High-strength seamless line pipe and manufacturing method thereof

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Effect test

Embodiment 1

[0028] The embodiment of the present invention provides a high-strength seamless line pipe, the chemical composition of which is:

[0029] C 0.06%, Si 0.35%, Mn 1.75%, Ti 0.03%, Mo 0.25%, Cr 0.48%, Mg0.001%, S 0.003%, P 0.008%, the rest is Fe and unavoidable impurities, CE Pcm 0.20%.

[0030] The preparation steps of the above-mentioned high-strength seamless line pipe are as follows:

[0031] Using scrap steel as raw material, through 80t electric arc furnace melting, ladle refining and continuous casting process, the continuous casting round billet with the same chemical composition as the above-mentioned high-strength seamless line pipe is produced; the continuous casting round billet is made by heating and perforating in the ring furnace Capillary, the capillary is rolled by a five-stand PQF unit to obtain a waste pipe, and the waste pipe is removed by a three-stand pipe removal machine, micro-tensioned, and cooled by a step-by-step cooling bed to make an outer diameter ...

Embodiment 2

[0040] The embodiment of the present invention provides a high-strength seamless line pipe, the chemical composition of which is:

[0041] C 0.08%, Si 0.25%, Mn 1.55%, Ti 0.02%, Mo 0.15%, Cr 0.55%, Mg0.0012%, S 0.005%, P 0.009%, the rest is Fe and unavoidable impurities, CE Pcm 0.20%.

[0042] The preparation steps of the above-mentioned high-strength seamless line pipe are as follows:

[0043] Using scrap steel as raw material, through 80t electric arc furnace melting, ladle refining and continuous casting process, the continuous casting round billet with the same chemical composition as the above-mentioned high-strength seamless line pipe is produced; the continuous casting round billet is made by heating and perforating in the ring furnace Capillary, the capillary is rolled by a five-stand PQF unit to obtain a waste pipe, and the waste pipe is removed by a three-stand pipe removal machine, micro-tensioned, and cooled by a step-by-step cooling bed to make an outer diameter ...

Embodiment 3

[0052] The embodiment of the present invention provides a high-strength seamless line pipe, the chemical composition of which is:

[0053] C 0.09%, Si 0.30%, Mn 1.68%, Ti 0.01%, Mo 0.20%, Cr 0.35%, Mg0.002%, S 0.008%, P 0.007%, the rest is Fe and unavoidable impurities, CE Pcm 0.22%.

[0054] The preparation steps of the above-mentioned high-strength seamless line pipe are as follows:

[0055] Using scrap steel as raw material, through 80t electric arc furnace melting, ladle refining and continuous casting process, the continuous casting round billet with the same chemical composition as the above-mentioned high-strength seamless line pipe is produced; the continuous casting round billet is made by heating and perforating in the ring furnace Capillary, the capillary is rolled by a five-stand PQF unit to obtain a waste pipe, and the waste pipe is removed by a three-stand pipe removal machine, micro-tensioned, and cooled by a step-by-step cooling bed to make an outer diameter ...

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Abstract

The invention relates to the technical field of seamless line pipe manufacturing, and particularly discloses a high-strength seamless line pipe and a manufacturing method thereof. The seamless line pipe is composed of the following components in percentage by weight: more than or equal to 0.06 percent and less than or equal to 0.1 percent of C, more than or equal to 0.15 percent and less than or equal to 0.35 percent of Si, more than or equal to 1.55 percent and less than or equal to 1.75 percent of Mn, more than or equal to 0.35 percent and less than or equal to 0.55 percent of Cr, more than or equal to 0.15 percent and less than or equal to 0.25 percent of Mo, more than or equal to 0.01 percent and less than or equal to 0.03 percent of Ti, more than or equal to 0.001 percent and less than or equal to 0.002 percent of Mg, less than or equal to 0.01 percent of S, less than or equal to 0.01 percent of P and the balance of Fe and inevitable impurities, wherein the carbon equivalent CEPcm is less than or equal to 0.25 percent. The seamless line pipe provided by the invention is simple in component system, low in manufacturing cost and excellent in strength, toughness and corrosion resistance, can be widely applied to oil and gas transportation in ultra-deep water sea areas, and has a wide market prospect.

Description

technical field [0001] The invention relates to the technical field of seamless line pipe manufacturing, in particular to a high-strength seamless line pipe and a preparation method thereof. Background technique [0002] According to the prediction of international authoritative organizations, from 2000 to 2030, the world's oil demand will increase by an average of 1.6%, and by 2030 the world's oil demand will reach 5.769 billion tons; the average annual growth of natural gas demand will be 2.4%, to In 2030, it will reach 4.203 billion tons of oil equivalent. With the rapid increase in the demand for oil and natural gas, the demand for line pipes used in the construction of oil and gas pipelines will also increase. However, relying solely on the development of ordinary oil and gas wells can no longer meet the rapidly growing demand for oil and natural gas, and it is necessary to increase the exploration and exploitation of oil and gas in deep waters. Therefore, in the futu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/22C22C38/28C22C38/38C22C33/06C21D1/18C21D8/10
CPCC22C38/38C22C38/22C22C38/28C22C38/02C22C38/002C22C33/06C21D8/105C21D1/18C21D2211/002C21D2211/005
Inventor 邓叙燕
Owner DALIPAL PIPE
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