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Step quenching heat treatment process for high-chromium grinding section

A technology of graded quenching and grinding, applied in the field of high-chromium cast iron, can solve the problems of easy loss of roundness and low hardness, and achieve the effects of reducing crushing, improving service life and improving the use effect.

Pending Publication Date: 2022-05-03
NINGGUO HUAFENG WEAR RESISTANT MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical application, it is found that the high chromium grinding section produced by continuous tempering furnace has low hardness and is easy to lose roundness.

Method used

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  • Step quenching heat treatment process for high-chromium grinding section
  • Step quenching heat treatment process for high-chromium grinding section

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Experimental program
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Effect test

Embodiment 1

[0039] A heat treatment process for high chromium grinding segment graded quenching, comprising the following steps:

[0040] S1, the high chromium grinding section of Cr10-20mm * 25mm (its raw material comprises by weight percentage: C 2.9%, Cr10.3%, Si 0.75%, Mn 0.58%, S 0.027%, P 0.029%, the balance is Fe ) Austenitizing treatment is carried out in a continuous push rod heating furnace, the temperature in the holding zone of the heating furnace is 950°C, and the holding time in the holding zone is 220min;

[0041] S2. Take out the austenitized high-chromium grinding section from the continuous push rod heating furnace, put it into the quenching oil at 90°C, and keep it in the quenching oil for 4 minutes. At this time, the surface temperature of the high-chromium grinding section is 140 ℃, where the flash point of quenching oil is 230℃, the maximum cooling rate of quenching oil is 70℃ / s, and the kinematic viscosity of quenching oil at 100℃ is 70-80mm 2 / s;

[0042] S3. Tak...

Embodiment 2

[0045] A heat treatment process for high chromium grinding segment graded quenching, comprising the following steps:

[0046] S1, with the high chromium grinding section of Cr12-50mm * 70mm (its raw material comprises by weight percentage: C 2.75%, Cr12.32%, Si 0.78%, Mn 0.58%, S 0.028%, P 0.031%, surplus is Fe ) Austenitizing treatment is carried out in a continuous push rod heating furnace, the temperature in the holding zone of the heating furnace is 960°C, and the time in the holding zone is 200min;

[0047] S2. Take out the austenitized high chromium grinding section from the continuous push rod heating furnace, put it into the quenching oil at 100°C, and keep it in the quenching oil for 7 minutes. At this time, the surface temperature of the high chromium grinding section is 150 ℃, where the flash point of quenching oil is 230℃, the maximum cooling rate of quenching oil is 70℃ / s, and the kinematic viscosity of quenching oil at 100℃ is 70-80mm 2 / s;

[0048]S3. Take out...

Embodiment 3

[0051] A heat treatment process for high chromium grinding segment graded quenching, comprising the following steps:

[0052] S1, the high chromium grinding section of Cr18-40mm * 45mm (its raw material comprises by weight percentage: C 2.73%, Cr18.26%, Si 0.83%, Mn 0.62%, S 0.027%, P 0.025%, the balance is Fe ) Austenitizing treatment is carried out in a continuous push rod heating furnace, the temperature in the holding zone of the heating furnace is 1050°C, and the time in the holding zone is 200min;

[0053] S2. Take out the austenitized high chromium grinding section from the continuous push rod heating furnace, put it into the quenching oil at 90°C, and keep it in the quenching oil for 5 minutes. At this time, the surface temperature of the high chromium grinding section is 150 ℃, where the flash point of quenching oil is 230℃, the maximum cooling rate of quenching oil is 70℃ / s, and the kinematic viscosity of quenching oil at 100℃ is 70-80mm 2 / s;

[0054] S3. Take out...

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Abstract

The invention discloses a step quenching heat treatment process for a high-chromium grinding section. The step quenching heat treatment process comprises the following steps: S1, heating the high-chromium grinding section for austenitizing treatment; s2, taking out the austenitized high-chromium grinding section, and putting the austenitized high-chromium grinding section into quenching oil for quenching; s3, the high-chromium grinding section is taken out of the quenching oil, and air cooling is carried out for cooling; and S4, the high-chromium grinding section subjected to air cooling is subjected to tempering treatment, and then air cooling is conducted to the room temperature. The quenching process is improved, a step quenching mode is selected, quenching process parameters are selected, martensite transformation is sufficient, the hardness of the high-chromium grinding section is improved, a proper tempering process is combined, the high-chromium grinding section contains a proper amount of retained austenite, a base body keeps good toughness, and the hardness of the high-chromium grinding section is improved. And finally, the high-chromium grinding section has proper hardness and toughness, and the risks of crushing, stripping and out-of-round of the high-chromium grinding section are reduced.

Description

technical field [0001] The invention relates to the technical field of high-chromium cast iron, in particular to a high-chromium grinding section graded quenching heat treatment process. Background technique [0002] High chromium white cast iron is the third generation of white cast iron developed after ordinary white cast iron and nickel hard cast iron. High-chromium white cast iron contains more than 10% chromium, and the ratio of chromium to carbon content is between 4-8. As a new generation of wear-resistant material, high-chromium white cast iron grinding section has the characteristics of high production efficiency, uniform hardness distribution, and good wear resistance. It is widely used in cement plants and building materials in my country. Because of its small size, it is not easy to break , so the requirement for hardness is higher. In today's fierce market competition, the technical upgrade and stable quality of high chromium grinding segments have become a dif...

Claims

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Application Information

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IPC IPC(8): C21D1/19C21D5/04
CPCC21D1/19C21D5/04
Inventor 陈全心陈灿光桂劲松程琦陈福燕方剑锋卢伟
Owner NINGGUO HUAFENG WEAR RESISTANT MATERIAL
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