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Quenching process for heat treatment of high chromium cast iron wear-resistant balls in water-based medium

A high-chromium cast iron, water-based quenching technology, applied in the field of warm quenching technology, can solve the problems of easy aging costs, environmental pollution, etc., and achieve the effect of no fire hazard, no smoke pollution, and no risk of carcinogenicity

Inactive Publication Date: 2016-03-02
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] High chromium casting ball with a diameter of 120mm, 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, keep warm for 2 hours to achieve austenitization;

[0024] (2) Quenching the cast iron wear-resistant ball into a water-based quenching agent with a concentration of 25%;

[0025] (3) at 200 o C Take the cast iron wear-resistant ball out of the water-based quenching fluid and keep it for a period of time so that the average temperature inside and outside the ball reaches 250 o C;

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

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

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

Embodiment 2

[0030] High chromium casting ball with a diameter of 50mm, 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, keep warm for 2 hours to achieve austenitization;

[0032] (2) Quenching the cast iron wear-resistant ball into a water-based quenching agent with a concentration of 20%;

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

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

[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 graded isothermal quenching process method for heat treatment of high-chromium cast iron wear-resistant balls in a water-based medium. The high-chromium cast iron wear-resistant balls are heated to 850-1050oC and kept for 2-4 hours to realize austenitization; Put the high-chromium cast iron wear-resistant ball into the water-based quenching agent with a mass concentration of 5% to 25% for quenching; take out the high-chromium cast iron wear-resistant ball and put it in an isothermal furnace at 220-300oC for 2-4 hours; take it out High chromium cast iron wear-resistant balls are air-cooled to room temperature. Water-based quenching medium is used in the heat treatment process of wear-resistant balls, and the appropriate quenching speed is controlled by adding water-based quenching agents with different cooling rates and controlling the concentration of quenching medium at the same time. Compared with the wear-resistant ball produced by common quenching medium and quenching process, the grinding ball has a more ideal comprehensive effect. At the same time, it can reduce the heat treatment cost of the wear-resistant ball and improve the environmental protection conditions of heat treatment.

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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Patent Type & Authority Patents(China)
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