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

The invention provides high-manganese pipeline steel and a preparation method thereof. The high-manganese pipeline steel is prepared from the following ingredients in percentage by weight: 0.4 to 0.7percent of C, 13 to 17 percent of Mn, 0.5 to 0.8 percent of Mo, 0.9 to 1.1 percent of Cr, 0.2 to 0.4 percent of Si, less than or equal to 0.010 percent of P, less than or equal to 0.003 percent of S,0.02 to 0.03 percent of Al, 0.02 to 0.03 percent of Nb, 0.03 to 0.06 percent of V and the balance of Fe and unavoidable impurities. The preparation method comprises the following steps of performing melting, casting and blank forming according to the high-manganese pipeline steel ingredients proportion; heating a cast blank to 1,200 to 1,250 DEG C; performing heat insulation for 1 to 2 hours; performing alloy element complete solid solution; performing sufficient tissue austenitizing; rolling the cast blank subjected to heat insulation; controlling the initial rolling and final rolling temperature and press-down quantity; cooling the materials to the room temperature after the rolling completion; obtaining the high-manganese austenitizing pipeline steel. The method has the advantages thatthe process is simple; the prepared high-manganese pipeline steel has ultralow yield ratio, higher tensile intensity, uniform elongation rate and excellent anti-corrosion performance, and is suitablefor being used as an oil gas conveying pipeline material in an extreme environment.

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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