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Heat treatment method for structure refinement of high-strength automobile steel

A heat treatment method and technology of heat treatment furnace, applied in the direction of heat treatment furnace, heat treatment equipment, furnace type, etc., can solve the problems of high equipment requirements, refinement, large equipment investment, etc., and achieve the effect of good effect, easy operation and simple equipment

Inactive Publication Date: 2020-01-24
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although SPD technology can refine grains to nanometer size, it is currently difficult to be used in large-scale production due to the complexity of the process and high equipment requirements.
Although the deformation heat treatment technology represented by TMCP technology can be used in industrial production, it has specific requirements for steel components and requires a large investment in equipment.
Although controlling the metal solidification process from a metallurgical point of view is also an effective method to refine the structure, it belongs to the upstream stage of metal preparation. Because the production process of steel materials is long and each subsequent process will affect the final structure, it is difficult to determine the final product. Whether the organization is refined

Method used

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  • Heat treatment method for structure refinement of high-strength automobile steel
  • Heat treatment method for structure refinement of high-strength automobile steel
  • Heat treatment method for structure refinement of high-strength automobile steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] High-strength automobile C-Mn-Cr steel plate sample (main component (mass percentage); C; 0.21%, Mn; 1.69%, Cr; 1.30%, Si; 0.04%, Ti; 0.002%, Nb; 0.009%, Fe; Surplus) whose size is 130mm * 30mm * 4mm (length * width * thickness), the heat treatment method of high-strength automobile steel structure refinement described in the present invention carries out the following steps of heat treatment successively in a heat treatment furnace;

[0029] S1, quenching treatment; the heating temperature is 950°C, the heating rate is 10°C / s, the holding time is 10min, the cooling method of quenching treatment is water cooling, and the cooling rate is about 20°C / s~25°C / s;

[0030] S2, tempering treatment; the tempering temperature is 630°C, the heating rate is 5°C / s, the holding time is 15min, the cooling method of tempering treatment is air cooling, and the cooling rate is about 5°C / s~8°C / s;

[0031] S3, quenching treatment; the heating temperature is 930°C, the heating rate is 10°C / ...

Embodiment 2

[0041] High-strength automobile C-Mn-Cr steel plate sample (main component (mass percentage); C; 0.27%, Mn; 2.03%, Cr; 1.50%, Si; 0.12%, Ti; 0.003%, Nb; 0.011%, Fe; Surplus) whose size is 130mm * 30mm * 4mm (length * width * thickness), the heat treatment method of high-strength automobile steel structure refinement described in the present invention carries out the following steps of heat treatment successively in a heat treatment furnace;

[0042] S1, quenching treatment; the heating temperature is 950°C, the heating rate is 10°C / s, the holding time is 10min, the cooling method of quenching treatment is water cooling, and the cooling rate is about 20°C / s~25°C / s;

[0043] S2, tempering treatment; the tempering temperature is 630°C, the heating rate is 5°C / s, the holding time is 15min, the cooling method of tempering treatment is air cooling, and the cooling rate is about 5°C / s~8°C / s;

[0044] S3, quenching treatment; the heating temperature is 940°C, the heating rate is 10°C / ...

Embodiment 3

[0053] High-strength automobile C-Mn-Cr steel plate sample (main component (mass percentage); C; 0.21%, Mn; 1.66%, Cr; 1.21%, Si; 0.05%, Ti; 0.01%, Nb; 0.034%, Fe; Surplus) whose size is 130mm * 30mm * 4mm (length * width * thickness), the heat treatment method of high-strength automobile steel structure refinement described in the present invention carries out the following steps of heat treatment successively in a heat treatment furnace;

[0054] S1, quenching treatment; the heating temperature is 940°C, the heating rate is 10°C / s, the holding time is 10min, the cooling method of quenching treatment is water cooling, and the cooling rate is about 20°C / s~25°C / s;

[0055] S2, tempering treatment; the tempering temperature is 620°C, the heating rate is 5°C / s, the holding time is 15min, the cooling method of tempering treatment is air cooling, and the cooling rate is about 5°C / s~8°C / s;

[0056] S3, quenching treatment; the heating temperature is 930°C, the heating rate is 10°C / s...

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Abstract

The invention discloses a heat treatment method for structure refinement of high-strength automobile steel. The heat treatment method includes the following steps that a high-strength automobile steelplate is put in a heat treatment furnace; quenching treatment at the heating temperature of 930-950 DEG C is carried out, and after quenching treatment is completed, tempering treatment at the heating temperature of 600-630 DEG C is conducted; and quenching treatment and tempering treatment are repeated by many times. The equipment required by the heat treatment method is simple, easy to operateand good in effect and can realize structure refinement of steel and iron materials with different components.

Description

technical field [0001] The invention relates to the technical field of steel material processing, in particular to a heat treatment method for microstructure refinement of high-strength automobile steel. Background technique [0002] Iron and steel materials are currently the most widely used metal structural materials. With the advancement of science and technology and social development, people's requirements for its performance are getting higher and higher. Microstructure refinement is currently the only method that can improve both strength and plasticity. There are many ways to refine the metal structure, including: from the perspective of metallurgy (solidification), increasing the nucleation rate by adding a non-uniform nucleating agent, increasing the nucleation rate by electromagnetic stirring during the solidification process, etc.; Plastic deformation (SPD) technology, such as equal channel angular extrusion (ECAP / ECAE), cumulative stack rolling (ARB), high pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/22C21D1/74C21D1/773C21D6/00C21D9/00C22C38/02C22C38/26C22C38/28C22C38/38
CPCC21D1/22C21D1/74C21D1/773C21D6/002C21D6/005C21D6/008C21D9/0081C22C38/02C22C38/26C22C38/28C22C38/38
Inventor 王永强黎俊良李娜张志伟孙浩黄飞朱国辉陈其伟
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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