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Steel plate with high strength and excellent low temperature toughness and fabrication method for steel plate

A technology of low-temperature toughness and manufacturing method, which is applied in the field of high-strength and high-toughness steel plate and its manufacturing, which can solve the difficulty of meeting the requirements of cooling the whole plate structure uniformity, thickness direction structure uniformity and upper and lower surface structure uniformity, and consumes a lot of resources , Consumption of energy and other issues, to achieve low cost, improve production efficiency, and reduce costs

Active Publication Date: 2019-02-19
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The problems in the production of high-strength and tough steel by conventional processes are high heating temperature, which consumes a lot of energy; adding a large amount of alloy elements or adopting quenching and tempering treatment (quenching + high-temperature tempering), which consumes a lot of resources; It is difficult to meet the requirements of uniformity in the thickness direction and uniformity of the upper and lower surfaces

Method used

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  • Steel plate with high strength and excellent low temperature toughness and fabrication method for steel plate
  • Steel plate with high strength and excellent low temperature toughness and fabrication method for steel plate
  • Steel plate with high strength and excellent low temperature toughness and fabrication method for steel plate

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Experimental program
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Effect test

Embodiment 1

[0026] Smelting according to the above chemical composition, the actual chemical composition mass percentage is as follows: C-0.10%, Si-0.32%, Mn-1.5%, P-0.015%, S-0.003%, Nb-0.04%, V-0.06%, Ti -0.015%, the rest is Fe.

[0027] Heat the billet to 810°C and keep it warm for 1 hour to make the temperature of the billet uniform. Afterwards, warm deformation was carried out, and the final plate thickness was 7 mm, and the total reduction rate in the thickness direction was 76%. During the rolling process, if the temperature drop of the billet is too large, the billet can be returned to the heating furnace to supplement the heat. After rolling, there is no need to control cooling, the steel plate can be air-cooled to room temperature

Embodiment 2

[0029] According to the above chemical composition for smelting, the actual chemical composition is as follows:

[0030] C-0.03%, Si-0.10%, Mn-1.0%, P-0.03%, S-0.03%, Nb-0.02%, V-0.02%, Ti-0.010%, and the rest is Fe.

[0031] Heat the billet to 780°C and keep it warm for 1 hour to make the temperature of the billet uniform. Afterwards, warm deformation was carried out, and the final plate thickness was 7 mm, and the total reduction rate in the thickness direction was 76%. During the rolling process, if the temperature drop of the billet is too large, the billet can be returned to the heating furnace to supplement the heat. After rolling, there is no need to control cooling, and the steel plate can be air-cooled to room temperature.

Embodiment 3

[0033] According to the above chemical composition for smelting, the actual chemical composition is as follows:

[0034] C-0.30%, Si-0.50%, Mn-2.0%, P-0.02%, S-0.02%, Nb-0.10%, V-0.10%, Ti-0.05%, and the rest is Fe.

[0035] Heat the billet to 810°C and keep it warm for 1 hour to make the temperature of the billet uniform. Afterwards, warm deformation was carried out, and the final plate thickness was 7 mm, and the total reduction rate in the thickness direction was 76%. During the rolling process, if the temperature drop of the billet is too large, the billet can be returned to the heating furnace to supplement the heat. After rolling, there is no need to control cooling, and the steel plate can be air-cooled to room temperature.

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Abstract

The invention belongs to the field of steel material fabrication and relates to a steel plate with high strength and excellent low temperature toughness and a fabrication method for the steel plate. According to the fabrication method for the steel plate, temperature deformation is performed in a ferrite+austenite two-phase area, a steel blank is air-cooled to room temperature directly after rolling, and cooling control is not needed. The tissue characteristics of the steel plate are that the steel plate has elongated ultrafine crystal tissue in the direction of full thickness, the crystal particle size is less than 3 um, and the steel plate has strong alpha and gamma fiber texture. The chemical composition of the thick steel plate is plain carbon steel or microalloy steel which comprisesthe chemical ingredients of, 0.03-0.30% of C, 0.10-0.50% of Si, 1.0-2.0% of Mn, less than 0.10% of P, less than 0.10% of S, less than 0.10% of Al, 0-0.10% of Nb, 0-0.10% of V, 0-0.05% of Ti, 0.0020-0.010% of N, 0-0.5% of Mo, 0-1.0% of Cr, 0-1.0% of Ni and the balance Fe. According to the steel plate developed under this composition system, the yield strength is larger than 500 MPa, the ductile-brittle transition temperature is below -120 DEG C, the elongation is larger than 25%, and the steel plate can be applied to the field of high demand for strong toughness, especially for low temperaturetoughness.

Description

technical field [0001] The invention relates to a high-strength and high-toughness steel plate and a manufacturing method thereof, especially a steel plate with high strength and excellent low-temperature toughness with a yield strength greater than 500 MPa, a ductile-brittle transition temperature lower than -120°C, and an elongation greater than 25%. its method of manufacture. Background technique [0002] In order to reduce weight and ensure safety, steel is required to have high strength and high toughness. In order to reduce the consumption of resources and energy, the manufacturing industry puts forward the concept of "green manufacturing". That is, it is required to produce steel with required properties without adding or adding a small amount of alloying elements. [0003] A common method for producing high-strength and high-toughness steel plates is the controlled rolling and controlled cooling process, that is, two-stage controlled rolling + controlled cooling af...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58
CPCC22C33/04C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58
Inventor 沈鑫珺唐帅陈俊刘振宇王国栋
Owner NORTHEASTERN UNIV LIAONING