Titanium microalloying seamless line pipe and preparation method thereof

A seamless line pipe and micro-alloying technology, applied in the direction of improving process efficiency, can solve the problems of complex alloy composition system and high manufacturing cost, and achieve the effects of improving surface quality, reducing production cost and increasing C content

Inactive Publication Date: 2019-06-18
DALIPAL PIPE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of complex alloy composition system and high manufacturing cost of the existing seamless line pipe, the present invention provides a seamless line pipe and a preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] An embodiment of the present invention provides a seamless line pipe, the chemical composition of which is:

[0046] C 0.13%, Si 0.35%, Mn 1.35%, S 0.0006%, P 0.01%, Ti 0.02%, V 0.001%, Al 0.04%, N 0.002%, Cr 0.005%, Ni 0.05%, Cu 0.04%, Mo 0.004 %, the rest is Fe and unavoidable impurities.

[0047] The preparation steps of the above-mentioned seamless line pipe are as follows:

[0048] Using scrap steel and direct reduced iron as raw materials, through 80t electric arc furnace melting, ladle refining, VD vacuum degassing, and continuous casting processes, a continuous casting round billet with a diameter of Φ180mm identical to the chemical composition of the above seamless line pipe is produced; continuous casting After the round billet is heated in an annular furnace, perforated, rolled by a five-stand PQF unit, removed by a three-stand tube removal machine, micro-tension reduction, and cooled by a step-by-step cooling bed, the outer diameter is 114.3mm and the wall ...

Embodiment 2

[0058] An embodiment of the present invention provides a seamless line pipe, the chemical composition of which is:

[0059] C 0.14%, Si 0.25%, Mn 1.25%, S 0.002%, P 0.008%, Ti 0.03%, Nb 0.01%, V 0.01%, Al 0.032%, N 0.004%, Cr 0.008%, Ni 0.08%, Cu 0.08 %, Mo 0.003%, and the rest are Fe and unavoidable impurities.

[0060] The preparation steps of the above-mentioned seamless line pipe are as follows:

[0061] Using scrap steel and direct reduced iron as raw materials, through 80t electric arc furnace melting, ladle refining, VD vacuum degassing, and continuous casting processes, a continuous casting round billet with a diameter of Φ180mm identical to the chemical composition of the above seamless line pipe is produced; continuous casting After the round billet is heated in an annular furnace, perforated, rolled by a five-stand PQF unit, removed by a three-stand tube removal machine, micro-tension reduction, and cooled by a step-by-step cooling bed, the outer diameter is 114.3m...

Embodiment 3

[0071] An embodiment of the present invention provides a seamless line pipe, the chemical composition of which is:

[0072] C 0.16%, Si 0.15%, Mn 1.40%, S 0.002%, P 0.006%, Ti 0.035%, V 0.003%, Al 0.022%, N 0.005%, Cr 0.01%, Ni 0.03%, Cu 0.03%, Mo 0.01%, the rest is Fe and unavoidable impurities.

[0073] The preparation steps of the above-mentioned seamless line pipe are as follows:

[0074] Using scrap steel and direct reduced iron as raw materials, through 80t electric arc furnace melting, ladle refining, VD vacuum degassing, and continuous casting processes, a continuous casting round billet with a diameter of Φ180mm identical to the chemical composition of the above seamless line pipe is produced; continuous casting After the round billet is heated in an annular furnace, perforated, rolled by a five-stand PQF unit, removed by a three-stand tube removal machine, micro-tension reduction, and cooled by a step-by-step cooling bed, the outer diameter is 114.3mm and the wall t...

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Abstract

The invention discloses a titanium microalloying seamless line pipe and a preparation method of the titanium microalloying seamless line pipe. The line pipe comprises the following components of, by weight percentage, 0.13% <= C <= 0.16%, 0.15% <= Si <= 0.35%, 1.25% <= Mn <= 1.40%, S <= 0.002%, P <= 0.01%, 0.02% <= Ti <= 0.04%, Nb <= 0.01%, V <= 0.01%, 0.02% <= Al <= 0.04%, N <= 0.005%, Cr <= 0.1%, Ni <= 0.08%, Cu <= 0.08%, Mo <= 0.01% and the balance Fe and inevitable impurities, wherein 0.008%+3.42 [N]+3 [S] <= Ti <= 0.012%+3.42 [N]+3 [S]. The single titanium alloying line pipe which is excellent in comprehensive performance and low in cost is successfully prepared by strictly controlling the content of each chemical component in the line pipe.

Description

technical field [0001] The invention relates to the technical field of manufacturing seamless line pipes, in particular to a titanium microalloyed 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% annually, and will reach 5.769 billion tons in 2030; the demand for natural gas will increase by an average annual rate of 2.4%, and will reach 4.203 billion tons of oil equivalent in 2030 . Pipeline transportation is the most reasonable way to realize efficient, economical, safe and pollution-free transportation of oil and gas. With the rapid growth of the demand for oil and natural gas, the demand for line pipes used in the construction of oil and gas pipelines will increase day by day. In 2017, my country's oil import dependence on foreign countries was close to 70%, far exceeding the so-called ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/14C22C38/12C22C38/16C22C38/08C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C21D8/10C21C7/10
CPCY02P10/20
Inventor 邓叙燕
Owner DALIPAL PIPE
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