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Heat-treatment method of high-chromium wear-resistant white cast iron Cr28

A heat treatment method and technology for white cast iron, which are applied in the field of heat treatment to improve the service life of high-chromium wear-resistant white cast iron Cr28, and achieve the effects of improving service life, service life, hardness and strength.

Active Publication Date: 2013-12-18
常熟紫金知识产权服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to improve the toughness of the existing high chromium and low carbon wear-resistant white cast iron Cr28, so as to avoid its fracture during use and improve the service life

Method used

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  • Heat-treatment method of high-chromium wear-resistant white cast iron Cr28
  • Heat-treatment method of high-chromium wear-resistant white cast iron Cr28

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Quenching: Take high-chromium wear-resistant white cast iron Cr28 and heat it to 1050°C, keep it warm for 1.5h, and air-cool to room temperature;

[0023] High-temperature tempering: heat the quenched cast iron Cr28 to 720°C, keep it warm for 2 hours, and air-cool to room temperature. The obtained cast iron Cr28 has a hardness of 46HRC;

[0024] Secondary quenching: heat cast iron Cr28 to 1050°C, keep it warm for 1.5h, and air cool to room temperature;

[0025] Low temperature tempering: heat cast iron Cr28 after secondary quenching to 500°C, keep it warm for 1.5h, and air cool to room temperature;

[0026] Repeat the low-temperature tempering step to obtain the product.

[0027] The hardness of the finally obtained cast iron Cr28 is 61HRC, and the grain structure is refined at the same time, and the wear-resistant hardened particles (carbides) are changed from thick strips to spherical shapes, and the alloy elements in the structure are more uniform. The service ...

Embodiment 2

[0029] Quenching: Take high-chromium wear-resistant white cast iron Cr28 and heat it to 1000 ° C, keep it warm for 3 hours, and air cool to room temperature;

[0030] High-temperature tempering: heat the quenched cast iron Cr28 to 730°C, keep it warm for 1.5h, and air cool to room temperature. The obtained cast iron Cr28 has a hardness of 47HRC.

[0031] Secondary quenching: heat cast iron Cr28 to 1000°C, keep it warm for 3 hours, and air cool to room temperature;

[0032] Low-temperature tempering: heat cast iron Cr28 after secondary quenching to 450°C, keep it warm for 2 hours, and air-cool to room temperature;

[0033] Repeat the low-temperature tempering step to obtain the product.

[0034] The hardness of the final cast iron Cr28 workpiece is 62HRC, and the grain structure is refined. At the same time, the wear-resistant hardened particles (carbides) change from thick strips to spherical shapes, and the alloy elements in the structure are more uniform. The service life ...

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Abstract

The invention discloses a heat-treatment method of high-chromium wear-resistant white cast iron Cr28. According to the invention, high-chromium wear-resistant white cast iron Cr28 is heated to 1000-1050 DEG C; the white cast iron Cr28 is heated and the temperature is maintained for 1.5-3h; the white cast iron Cr28 is air-cooled to room temperature; the white cast iron Cr28 is heated to 710-730 DEG C; the white cast iron Cr28 is tempered at the temperature for 1.5-2h; the white cast iron Cr28 is air-cooled to room temperature; and secondary quenching and twice low-temperature tempering are carried out, such that the high-chromium wear-resistant white cast iron Cr28 with prolonged service life is obtained. According to the invention, the crystal grains of the processed cast iron Cr28 are refined, and alloy elements in tissues are more uniform. Especially, characteristic points with high hardness and high wear-resistance in the alloy are converted from thick strips into spheres, such that impact toughness is improved, and service life is prolonged.

Description

technical field [0001] The invention relates to a heat treatment method for high-chromium wear-resistant white cast iron Cr28, in particular to a heat treatment method for improving the service life of high-chromium wear-resistant white cast iron Cr28. Background technique [0002] At present, most of the workpieces requiring high wear resistance in the domestic market are high manganese steel castings. High manganese steel is widely used because of its good deformation strengthening ability and high toughness. However, the wear resistance of high manganese wear-resistant steel is not too high due to its low hardness of the matrix and few special carbide points of high hardness and wear resistance, so that it can be used in the production environment that requires extremely high performance and extremely harsh working conditions. Short life and frequent replacement. [0003] However, the high-chromium low-carbon wear-resistant white cast iron Cr28 that appeared in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D5/04C21D1/18
Inventor 王玲蔡文静郭胜利杨春军
Owner 常熟紫金知识产权服务有限公司
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