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TWIP steel and preparation method thereof

A steel plate, fe-mn-c technology, which is applied in the field of TWIP steel and its preparation, can solve the problems that the tensile strength of TWIP steel cannot meet the needs of industrial applications, and limit the wider application of TWIP steel.

Active Publication Date: 2021-04-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The tensile strength of TWIP steel in the above patents is still far from meeting the growing demand for industrial applications, which limits the wider application of TWIP steel in oil and gas development and other fields

Method used

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  • TWIP steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Prepare a kind of tungsten-alloyed high-strength high-plasticity TWIP steel in the present invention, its composition and percentage by weight are: C: 0.6%, Mn: 16%, W: 1.5%, Cr: 1%, Mo: 0.2%, Ni: 0.1%, Ti: 0.1%, V: 0.1%, the balance is Fe and unavoidable impurities. Wherein the W / C weight ratio is 2.5.

[0035] The specific steps of its preparation method include:

[0036] 1) Melting: Put TWIP steel into the vacuum induction furnace in proportion to the designed components for melting, and cast it into ingots after melting;

[0037] 2) Forging: the ingot is forged, and the forging ratio is 2.8.

[0038] 3) Homogenization treatment: Homogenize the forgings in an air furnace at 1150°C, heat for 1 hour, and then water-cool;

[0039] 4) Hot rolling: The homogenized forgings are hot-rolled. The hot-rolling start temperature is 1050°C, the end temperature is 850°C, the total downdraft is 30%, and the hot-rolled steel plate is 20 mm thick.

[0040] 5) Cold rolling: after ...

Embodiment 2

[0044]Prepare a kind of tungsten-alloyed high-strength high-plasticity TWIP steel in the present invention, its composition and percentage by weight are: C: 0.4%, Mn: 18%, W: 2%, Cr: 1%, Mo: 0.3%, Ni: 0.05%, Ti: 0.05%, V: 0.05%, the balance is Fe and unavoidable impurities. Wherein the W / C weight ratio is 5.

[0045] The specific steps of its preparation method include:

[0046] 1) Melting: Put TWIP steel into the vacuum induction furnace in proportion to the designed components for melting, and cast it into ingots after melting;

[0047] 2) Forging: the ingot is forged, and the forging ratio is 2.8.

[0048] 3) Homogenization treatment: Homogenize the forgings in an air furnace at 1150°C, heat for 1 hour, and then water-cool;

[0049] 4) Hot rolling: The homogenized forgings are hot-rolled. The hot-rolling start temperature is 1050°C, the end temperature is 850°C, the total downforce is 30%, and the hot-rolled steel plate is 20 mm thick.

[0050] 5) Cold rolling: after th...

Embodiment 3

[0054] Prepare a kind of tungsten-alloyed high-strength high-plasticity TWIP steel in the present invention, its composition and percentage by weight are: C: 0.3%, Mn: 18%, W: 2%, Cr: 1%, Mo: 1%, Ni: 0.05%, Ti: 0.05%, V: 0.05%, the balance is Fe and unavoidable impurities. Among them, the W / C weight ratio is 6.7.

[0055] The specific steps of its preparation method include:

[0056] 1) Melting: Put TWIP steel into the vacuum induction furnace in proportion to the designed components for melting, and cast it into ingots after melting;

[0057] 2) Forging: the ingot is forged, and the forging ratio is 2.8.

[0058] 3) Homogenization treatment: Homogenize the forgings in an air furnace at 1150°C, heat for 1 hour, and then water-cool;

[0059] 4) Hot rolling: The homogenized forgings are hot-rolled. The hot-rolling start temperature is 1050°C, the end temperature is 850°C, the total downforce is 30%, and the hot-rolled steel plate is 20 mm thick.

[0060] 5) Cold rolling: aft...

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Abstract

The invention provides TWIP steel. W is added on the basis of Fe-Mn-C series TWIP steel, one or more of Cr, Mo, Ni, Ti and V alloy elements can be selectively added, and the weight ratio of W to C is 1.25-10, preferably 2-5. Besides, the invention provides a preparation method of the TWIP steel, in combination with a proper heat treatment process, the accidental effect of improving the strength without influencing plasticity can be achieved, and the good plasticity of the TWIP steel is maintained while the strength of the TWIP steel is improved.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy and metal materials, and in particular relates to a TWIP steel and a preparation method thereof. Background technique [0002] Austenitic TWIP (twinning-induced plasticity) steel has the characteristics of high strength, high toughness and high strain hardening rate. As a lightweight material, it has broad application prospects in the fields of automobile and LNG ship manufacturing, oil and gas development, etc. [0003] In the process of continuous development of TWIP steel, people have successively developed the first generation of Fe-Mn-Si-Al series TWIP steel, the second generation of Fe-Mn-C series TWIP steel and the derivatives based on this. Fe-Mn-C-Al and Fe-Mn-C-(Mo, Cr) type TWIP steels. Most of the existing TWIP steels have good elongation, but low yield strength and tensile strength. [0004] In high-strength low-alloy steels, strong carbide-forming elements such as Ni, V, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C22C38/44C22C38/46C22C38/50C22C38/58C21D1/18C21D1/26C21D6/00C21D8/02C21D9/00
Inventor 李世瀚王晓霖赵巍李遵照李明薛倩刘名瑞
Owner CHINA PETROLEUM & CHEM CORP
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