High-hardness high-carbon medium-chromium wear-resistant cast iron and preparation method thereof

A wear-resistant cast iron and high-hardness technology, applied in the field of wear-resistant cast iron, can solve the problems of further improvement in hardness, complex preparation process, long production cycle, etc., and achieve the effects of strong plastic deformation, simple process and short production cycle

Active Publication Date: 2021-02-12
WUHAN UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In summary, the existing wear-resistant cast iron has technical defects of high production cost, complicated preparation process and long production cycle, and the hardness needs to be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A high-hardness high-carbon medium-chromium wear-resistant cast iron and a preparation method thereof. The chemical composition and content of the high-hardness high-carbon medium-chromium wear-resistant cast iron are: C is 3.61wt%, Cr is 12.11wt%, Si is 0.51wt%, Mn is 0.61, Mo is 1.71wt%, and B is 0.39wt%, Zr is 0.51wt%, P≤0.03wt%, S≤0.03wt%, the balance is Fe and unavoidable impurities; wherein: Cr / C=3.35, B / Mo=0.23.

[0029] According to the chemical composition and content of ingredients, smelting, pouring, air cooling to room temperature, grinding; then heating to 850 ° C, heat preservation for 3 hours, quenching into oil, cooling to room temperature, to obtain high hardness and high carbon medium chromium wear-resistant cast iron.

[0030] The high-hardness high-carbon medium-chromium wear-resistant cast iron prepared by the present invention is tested: the carbide is 53vol%, the retained austenite is 12vol%, and the rest is martensite; the high-hardness high-car...

Embodiment 2

[0032] A high-hardness high-carbon medium-chromium wear-resistant cast iron and a preparation method thereof. The chemical composition and content of the high-hardness high-carbon medium-chromium wear-resistant cast iron are: C is 3.76wt%, Cr is 14.99wt%, Si is 0.64wt%, Mn is 0.7wt%, Mo is 1.8wt%, B is 0.34wt%, Zr is 0.64wt%, P≤0.03wt%, S≤0.03wt%, the balance is Fe and unavoidable impurities; wherein: Cr / C=3.986, B / Mo=0.189.

[0033] According to the chemical composition and content of ingredients, smelting, pouring, air cooling to room temperature, grinding; then heating to 950 ° C, heat preservation for 2 hours, quenching into oil, cooling to room temperature, to obtain high hardness and high carbon medium chromium wear-resistant cast iron.

[0034] The high-hardness high-carbon medium-chromium wear-resistant cast iron prepared by the present invention is tested: the carbide is 50.3vol%, the retained austenite is 9vol%, and the rest is martensite; the high-hardness high-car...

Embodiment 3

[0036] A high-hardness high-carbon medium-chromium wear-resistant cast iron and a preparation method thereof. The chemical composition and content of the high-hardness high-carbon medium-chromium wear-resistant cast iron are: C is 3.85wt%, Cr is 13.55wt%, Si is 0.73wt%, Mn is 0.78wt%, Mo is 1.87wt%, B is 0.36wt%, Zr is 0.76wt%, P≤0.03wt%, S≤0.03wt%, the balance is Fe and unavoidable impurities; wherein: Cr / C=3.519, B / Mo=0.193.

[0037] According to the chemical composition and content of ingredients, smelting, pouring, air cooling to room temperature, grinding; then heating to 1000 ° C, heat preservation for 1 hour, quenching into oil, cooling to room temperature, to obtain high hardness and high carbon medium chromium wear-resistant cast iron.

[0038] The high-hardness high-carbon medium-chromium wear-resistant cast iron prepared by the present invention is tested: the carbide is 48.4vol%, the retained austenite is 6.5vol%, and the rest is martensite; the hardness of the hi...

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Abstract

The invention relates to high-hardness high-carbon medium-chromium wear-resistant cast iron and a preparation method thereof. According to the technical solution, the high-hardness high-carbon medium-chromium wear-resistant cast iron comprises the following chemical components of, in percentage by weight, 3.61wt%-3.99wt% of C, 12.11wt%-14.99wt% of Cr, 0.51wt%-0.79wt% of Si, 0.61wt%-0.89wt% of Mn,1.71wt%-1.99wt% of Mo, 0.31wt%-0.39wt% of B, 0.51wt%- 0.89wt% of Zr, less than or equal to 0.049wt% of P, less than or equal to 0.049wt% of S, the balance Fe and the inevitable impurities, wherein Cr / C is greater than or equal to 3.35 and less than or equal to 3.99, and B / Mo is greater than or equal to 0.15 and less than or equal to 0.23, burdening is conducted according to the chemical componentsand the contents thereof, smelting, pouring, air-cooling to room temperature, and polishing are conducted; and heating is conducted to 850-1050 DEG C, the temperature is kept for 1-3 hours, quenchinginto oil is conducted, and cooling is conducted to the room temperature to obtain the high-hardness high-carbon medium-chromium wear-resistant cast iron. The high-hardness high-carbon medium-chromiumwear-resistant cast iron and the preparation method thereof have the characteristics of low production cost, simple preparation method and short production period, and a prepared product has good toughness and hardness is significantly improved.

Description

technical field [0001] The invention belongs to the technical field of wear-resistant cast iron. In particular, it relates to a high-hardness high-carbon medium-chromium wear-resistant cast iron and a preparation method thereof. Background technique [0002] Wear-resistant cast iron refers to cast iron with high hardness and high wear resistance in which the carbon in the alloy mainly exists in the form of carbides. The main method to improve the hardness of wear-resistant cast iron is to increase the hardness of the matrix and reduce the amount of retained austenite, ferrite and bainite. The main method to improve the hardness of the matrix is ​​to increase the C content, thereby increasing the content of martensite and increasing the number of alloy carbides; reducing the retained austenite is mainly to increase the transformation of martensite, that is, to change the martensite transformation point M s Control above room temperature; reduce the amount of ferrite mainly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C37/06C21D1/18
CPCC22C37/10C22C37/06C21D1/18C21D2211/008C21D2211/001C21D2211/004
Inventor 吴开明郑欢
Owner WUHAN UNIV OF SCI & TECH
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