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A kind of high manganese pipeline steel and its preparation method

A pipeline steel and high manganese technology, applied in the field of metal material rolling, can solve the problems of high yield strength and weak deformation resistance, and achieve the effects of low yield strength ratio, energy saving, and good corrosion resistance

Active Publication Date: 2020-10-09
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, high-strength pipeline steel is a typical acicular ferrite or bainite, with relatively high yield strength and relatively weak deformation resistance.

Method used

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  • A kind of high manganese pipeline steel and its preparation method
  • A kind of high manganese pipeline steel and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A high manganese pipeline steel whose composition by weight percentage is C 0.46%, Si 0.21%, Mn 15%, P0.010%, S 0.002%, Al 0.02%, Mo 0.57%, Cr 0.98%, Nb 0.02%, V 0.034%, the balance is Fe and unavoidable impurities.

[0036] The preparation method steps of the high manganese pipeline steel are as follows:

[0037] Smelted according to the set composition, cast into billet, the composition by weight percentage is C 0.46%, Si 0.21%, Mn 15%, P 0.010%, S 0.002%, Al 0.02%, Mo 0.57%, Cr 0.98%, Nb 0.02% , V 0.034%, the balance is Fe and unavoidable impurities;

[0038] Heat the billet to 1200°C and keep it warm for 2 hours;

[0039] Carry out rolling, the starting rolling temperature is 1160°C, the total reduction is 86%, and the finishing rolling temperature is 930°C;

[0040] After rolling, air-cool to room temperature to produce high-manganese pipeline steel. The microstructure under the scanning electron microscope is as follows: figure 2 As shown, take another sample...

Embodiment 2

[0046] A high manganese pipeline steel whose composition by weight percentage is C 0.65%, Si 0.28%, Mn 19%, P0.006%, S 0.003%, Al 0.04%, Mo 0.76%, Cr 1.07%, Nb 0.03%, V 0.058%, the balance is Fe and unavoidable impurities;

[0047] The preparation method steps of the high manganese pipeline steel are as follows:

[0048] Smelted according to the set composition, cast into billet, the composition by weight percentage is C 0.65%, Si 0.28%, Mn 19%, P 0.006%, S 0.003%, Al 0.04%, Mo 0.76%, Cr 1.07%, Nb 0.03% , V 0.058%, the balance is Fe and unavoidable impurities;

[0049] Heat the billet to 1250°C and keep it warm for 1h;

[0050] Carry out rolling, the starting rolling temperature is 1171°C, the total reduction is 89%, and the final rolling temperature is 830°C;

[0051] After rolling, air-cool to room temperature to produce high-manganese pipeline steel. The structure observed under a microscope is a single-phase austenite structure;

[0052] The finished high manganese pip...

Embodiment 3

[0057] A high manganese pipeline steel whose composition by weight percentage is C 0.5%, Si 0.26%, Mn 15.2%, P0.002%, S 0.001%, Al 0.03%, Mo 0.6%, Cr 0.92%, Nb 0.026%, V 0.047%, the balance is Fe and unavoidable impurities.

[0058] The preparation method steps of the high manganese pipeline steel are as follows:

[0059] Smelted according to the set composition, cast into billet, the composition is C 0.5%, Si 0.26%, Mn15.2%, P 0.002%, S 0.001%, Al 0.03%, Mo 0.6%, Cr 0.92%, Nb 0.026% by weight %, V 0.047%, the balance is Fe and unavoidable impurities;

[0060] Heat the billet to 1230°C and keep it warm for 1.5h;

[0061] Carry out rolling, the starting rolling temperature is 1193°C, the total reduction is 87%, and the final rolling temperature is 880°C;

[0062] After rolling, air-cool to room temperature to produce high-manganese pipeline steel. The structure observed under a microscope is a single-phase austenite structure;

[0063] The finished high manganese pipeline s...

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Abstract

A kind of high manganese pipeline steel and its preparation method of the present invention. The components of the high manganese pipeline steel in weight percentage are C 0.4~0.7%, Mn 13~17%, Mo 0.5~0.8%, Cr 0.9~1.1%, Si 0.2~ 0.4%, P≤0.010%, S≤0.003%, Al 0.02~0.03%, Nb 0.02~0.03%, V 0.03~0.06%, the balance is Fe and unavoidable impurities. The steps of the production method are: smelting and casting the high manganese pipeline steel into a billet according to the composition ratio, heating the billet to 1200-1250°C, and holding it for 1-2 hours to completely dissolve the alloy elements and fully austenitize the structure; The final cast slab is rolled, and the opening and final rolling temperatures and reductions are controlled. After the rolling is completed, it is cooled to room temperature to obtain high manganese austenitic pipeline steel. The process of this method is simple, and the prepared high-manganese pipeline steel has extremely low yield ratio, high tensile strength, uniform elongation and excellent corrosion resistance, and is suitable as an oil and gas transmission pipeline material in extreme environments.

Description

Technical field: [0001] The invention belongs to the technical field of metal material rolling, and in particular relates to a high-performance high-manganese pipeline steel and its manufacturing process, in particular to a corrosion-resistant steel with high strength, low yield ratio, high uniform elongation, and strong production process applicability. High manganese pipeline steel and its manufacturing process. Background technique: [0002] In recent years, oil and gas transmission pipelines have extended to polar regions, oceans, and geologically unstable areas, and the pipelines face the threats of large displacement environments such as frozen soil, ocean currents, seismic zones, debris flows, landslides, and large drop areas. [0003] The development of harsh environment oil and gas fields such as polar oil and gas fields, remote oil and gas fields, offshore oil and gas fields, and sour oil and gas fields has made the economic requirements for improving long-distance...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/06C22C38/24C22C38/26C21D8/00
CPCC21D8/005C21D2211/001C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24C22C38/26
Inventor 高秀华李晶杜林秀张大征邱春林吴红艳
Owner NORTHEASTERN UNIV LIAONING
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