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Quenching process for heat treatment of high-chromium iron wear-resisting ball in water-based medium

A technology of high-chromium cast iron and process method, which is applied in the field of warm quenching process, can solve the problems of easy aging cost, pollute the environment, etc., and achieve the effects of no fire danger, no smoke pollution, and increased production cost.

Inactive Publication Date: 2014-07-02
BEIJING JATR NEW MATERIAL TECH
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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 overcome the defects of traditional quenching medium such as polluting the environment, easy aging and high cost, using water-based quenching medium as a substitute medium for the traditional quenching medium of high chromium-resistant grinding balls, and adopting a reasonable graded isothermal quenching heat treatment process scheme at the same time, so that High chromium wear-resistant balls meet or exceed the original performance indicators

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 120mm diameter high chromium cast ball, containing C: 2%, Si: 0.6%, Mn: 1.0%, S: 0.02%, P: 0.01%, Cr: 18%;

[0023] (1) Heat the cast iron wear-resistant ball to 1000 o C, heat preservation for 2 hours to achieve austenitization;

[0024] (2) Put the cast iron wear-resistant ball into 25% water-based quenching agent for quenching;

[0025] (3) At 200 o C. Take the cast iron wear-resistant ball out of the water-based quenching liquid and keep it for a period of time to make the internal and external temperature of the grinding ball reach 250 o C;

[0026] (4) Take out the cast iron wear-resistant ball and put it into 300 o C temperature isothermal furnace is isothermal for 4 hours;

[0027] (5) Take out the cast iron wear-resistant ball and cool it to room temperature.

[0028] The surface hardness reaches HRC60, the core hardness reaches HRC55, and the impact toughness reaches 4.5J.

Embodiment 2

[0030] 50mm diameter high chromium cast ball, containing C: 2.5%, Si: 0.8%, Mn: 10.7%, S: 0.01%, P: 0.005%, Cr: 20%;

[0031] (1) Heat the cast iron wear-resistant ball to 950 o C, heat preservation for 2 hours to achieve austenitization;

[0032] (2) Put the cast iron wear-resistant ball into a 20% water-based quenching agent for quenching;

[0033] (3) Take out the cast iron wear-resistant ball and put it into 230 o Temper in the tempering furnace at C temperature for 3 hours;

[0034] (4) Take out the cast iron wear-resistant ball and cool it to room temperature.

[0035] The surface hardness reaches HRC59, the core hardness reaches HRC55, and the impact toughness reaches 4J.

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Abstract

The invention discloses a step and isothermal quenching process for heat treatment of a high-chromium iron wear-resisting ball in a water-based medium, which comprises the steps of heating the high-chromium iron wear-resisting ball to 850-1050 DEG C and preserving the temperature for 2-4h to realize austenitizing, putting the high-chromium iron wear-resisting ball into a 5-25% water-based quenching agent, taking out the high-chromium iron wear-resisting ball to be put into an isothermal oven at 220-300 DEG C for isothermality for 2-4h, and taking out the high-chromium iron wear-resisting ball and air cooling to the room temperature. In the heat treatment process of the wear-resisting ball, the water-based quenching medium is used, appropriate quenching speed is controlled by adding the water-based quenching medium at different cooling speeds and controlling the concentration of the quenching medium, the step quenching process and isothermal quenching process are used to ensure that the quenched wear-resisting ball has more ideal comprehensive effect than the wear-resisting balls which are produced by using common quenching media and quenching processes, and at the same time, the heat treatment cost of the wear-resisting ball can be reduced and the environmental conditions of the heat treatment can be improved.

Description

technical field [0001] The invention belongs to the field of casting materials and heat treatment, in particular to a graded austempering process for heat treatment of high-chromium cast iron wear-resistant balls in a water-based medium. Background technique [0002] At present, the heat treatment medium of wear-resistant cast balls in my country generally has the following types: 1) air cooling or fog cooling; 2) quenching oil; 3) nitrate salt. The advantages of quenching oil are: the cooling speed is relatively moderate at the low temperature stage, and the wear-resistant ball is not easy to be quenched or deformed. The disadvantages are 1) the cooling speed is slow in the middle and high temperature stage, and the hardness of the wear-resistant ball is not enough; 2) the aging deterioration is serious, and the consumption speed is fast; 3) it is easy to catch fire and the smoke pollution is serious; the nitrate salt has a high service temperature and a wide service temper...

Claims

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Application Information

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IPC IPC(8): C21D5/00C21D1/60
Inventor 周平安史新民李纲王小非李延森
Owner BEIJING JATR NEW MATERIAL TECH
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