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High-chromium cast iron grinding ball and heat treatment method thereof

A heat treatment method and high chromium cast iron technology, applied in the field of cast iron heat treatment technology, can solve the problems of unstable cooling method, pollution and danger, and achieve the effects of good cooling uniformity, uniform texture and small consumption

Inactive Publication Date: 2017-08-11
TOYO GRINDING BALL MAANSHAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of unstable cooling mode, pollution, danger, etc. in the heat treatment process of the existing high-chromium cast iron grinding balls, the present invention provides a high-chromium cast iron grinding ball and its heat treatment method, which has stable cooling and can provide a high-quality High chromium cast iron grinding balls have the advantages of safety and environmental protection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A high chromium cast iron grinding ball, Cr content is 11.4%, carbon C content is 2.65%, V / S=1mm, V represents the volume of the casting, S represents the surface area of ​​the casting, V / S represents the modulus of the casting, the following Heat treatment method:

[0034] S1. Pretreatment, heat up to 890°C at a heating rate of 100°C / h, and keep warm for 2 hours;

[0035] The choice of heat preservation for 2 hours is determined by the as-cast structure; the microstructure test shows that the austenite content of the as-cast structure of the ball to be heat treated is relatively small, about 5%. In order to fully improve the hardenability of the ball, uniform internal Stress, so determine the holding time at a temperature of 890 ° C for 2 hours;

[0036] S2. Quenching treatment, continue to heat the balls after heat preservation in S1 to 950+(A-5B-4)×18.75=950+0×18.75=950℃ at a heating rate of 100°C / h, (11.4-5×2.65 -4)=-5.85<0, then the value of (A-5B-4) is 0, keep w...

Embodiment 2

[0042] A kind of high chromium cast iron grinding ball, Cr content is 17.5%, carbon C content is 2.38%, V / S=1.5, V represents the volume of the casting, S represents the surface area of ​​the casting, V / S represents the modulus of the casting, as follows Heat treatment method:

[0043] S1. Pretreatment, heating to a temperature of 700°C at a heating rate of 100°C / h, and holding for 6 hours;

[0044]The choice of heat preservation for 6 hours is determined by the as-cast structure; the microstructure test shows that the austenite content of the as-cast structure of the ball to be heat treated is about 10%, in order to fully improve the hardenability of the ball and uniform internal stress, so Determine the holding time at a temperature of 700°C for 6 hours;

[0045] S2. Quenching treatment, continue heating the balls after heat preservation in S1 to 950+(A-5B-4)×18.75=950+(17.5-5×2.38-4)×18.75=980 at a heating rate of 100°C / h After ℃, keep it warm for 4 hours, put it into the...

Embodiment 3

[0051] A high chromium cast iron grinding ball, Cr content is 27.52%, carbon C content is 2.25%, V / S=0.8, V represents the volume of the casting, S represents the surface area of ​​the casting; adopt the following heat treatment method:

[0052] S1. Pretreatment, heating to a temperature of 600°C at a heating rate of 100°C / h, and holding for 10 hours;

[0053] The selection of holding time for 10 hours is determined by the as-cast structure; through microstructure testing, the austenite content in the as-cast structure of the ball to be heat treated is relatively large, accounting for more than 20%. In order to fully improve the hardenability of the ball, uniform internal Stress, so at a temperature of 600 ° C, determine the holding time for 10 hours;

[0054] S2. Quenching treatment, continue heating the balls after heat preservation in S1 to 950+(A-5B-4)×18.75=950+(27.52-5×2.25-4)×18.75≈1180 at a heating rate of 100°C / h After ℃, keep it warm for 3 hours, put it into the coo...

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Abstract

The invention discloses a high-chromium cast iron grinding ball and a heat treatment method thereof, belonging to the field of cast iron heat treatment technology, and solves the problems of unstable cooling mode, pollution, danger, etc. in the heat treatment process of the existing high-chromium cast iron grinding ball. A heat treatment method for high chromium cast iron grinding balls of the present invention comprises the following steps: S1. pretreatment; heat preservation at 600-890°C for 2-10 hours; S2. quenching treatment, heating to 880-1100°C, heat preservation for 3-6 hours hours, put it into the cooling medium for immersion time t, cool to 150-350°C, take it out from the quenching medium, put it in the air and cool slowly to room temperature; S3. Tempering treatment, after heating to 200-530°C, Cool to room temperature. The invention can provide a high-quality high-chromium cast iron grinding ball, and has the advantages of safety and environmental protection.

Description

technical field [0001] The invention belongs to the field of cast iron heat treatment technology, and in particular relates to a high-chromium cast iron grinding ball and a heat treatment method thereof. Background technique [0002] High chromium cast iron is the best wear-resistant material nowadays, with high strength, high toughness and high wear resistance. Its chromium content is between 10% and 30%, and it has good hardenability; If the speed is too fast, quenching cracks will occur; if the cooling speed of air cooling or air cooling is too slow, some precious alloy elements need to be added, but the cooling parts are not uniform, and the hardness after quenching is low; in the prior art, when oil cooling is used, it is necessary to choose viscosity , slow quenching oil with low flash point, this kind of quenching oil is easy to age, high in cost, serious in pollution, and high in fire hazard, and is the key control object of energy saving, environmental protection an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D5/00C22C37/06
CPCC21D5/00C22C37/06
Inventor 春日宏之黄友革
Owner TOYO GRINDING BALL MAANSHAN
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