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A special quenching agent for large shaft and its manufacturing method

A quenching agent, a large-scale technology, applied in the direction of quenching agent, manufacturing tools, furnace types, etc., can solve the problems of no quenching agent, high production cost, fragile shaft, etc., to ensure no quenching crack, reduce heat treatment costs, avoid quenching effect

Active Publication Date: 2014-10-29
深圳市新元特钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]Aiming at 45# steel, the shaft with a diameter of 1.8-3.5m is easy to break, there is no special quenching agent, the production cost is high, the risk is high, and it needs To solve the problem of developing a new quenching agent, the present invention provides a special quenching agent for large shafts and its manufacturing method. The quenching agent is made by adding reasonable components and strictly controlled component distribution ratio. For the material is 45# steel, the diameter When the shaft between 1.8-3.5m is quenched, the cooling rate of the workpiece is fast in the range of 650 ~ 450 ° C, and the cooling rate is slow below 400 ° C. Not only can a good quenching effect be obtained, but also the occurrence of quenching cracks can be avoided. The production method of the quenching agent, by controlling the temperature of the raw materials and the order of addition, ensures that each component in the quenching agent is completely dispersed and evenly distributed, so that the form of the quenching agent is close to colloidal, and the cooling rate below 400 ° C is reduced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A method for preparing a special quenching agent for large shafts, the steps of which are:

[0048] (1) Dissolve sodium chloride and sodium hydroxide in water at a temperature of 10°C and stir for 20 minutes to obtain a mixed solution;

[0049] (2) Heat the mixed solution in step (1) to 30°C, add mesotrione, sodium citrate, lotus root starch and acrylic acid, and stir for 20 minutes;

[0050] (3) Let the mixed solution obtained in step (2) stand for cooling, add starch when the temperature reaches 20°C, and stir for 60 minutes;

[0051] (4) Freeze the mixed solution obtained in step (3) in an environment of -10°C for 30 minutes to obtain a frozen mixed solution;

[0052] (5) Heat the frozen mixed solution obtained in step (4) to 35°C, add maleic acid, p-cresol and mecitrione, stir for 80 minutes, then continue heating to 93°C, and stir for another 15 minutes;

[0053] The weight percent of each material used above is: sodium chloride 2.0%; Sodium hydroxide 0.8%; Sodium ...

Embodiment 2

[0056] A method for preparing a special quenching agent for large shafts, the steps of which are:

[0057] (1) Dissolve sodium chloride and sodium hydroxide in water at a temperature of 25°C and stir for 10 minutes to obtain a mixed solution;

[0058] (2) Heat the mixed solution in step (1) to 40°C, add mesotrione, sodium citrate, lotus root starch and acrylic acid, and stir for 15 minutes;

[0059] (3) Let the mixed solution obtained in step (2) stand for cooling, add starch when the temperature reaches 20°C, and stir for 80 minutes;

[0060] (4) Freeze the mixed solution obtained in step (3) in an environment of -25°C for 60 min to obtain a frozen mixed solution;

[0061] (5) Heat the frozen mixed solution obtained in step (4) to 30°C, add maleic acid, p-cresol and mecitrione, stir for 100 minutes, then continue to heat to 95°C, and stir for another 10 minutes;

[0062] The percentage by weight of each material used above is: sodium chloride 3.0%; Sodium hydroxide 0.5%; So...

Embodiment 3

[0065] A method for preparing a special quenching agent for large shafts, the steps of which are:

[0066] (1) Dissolve sodium chloride and sodium hydroxide in water at a temperature of 19°C and stir for 15 minutes to obtain a mixed solution;

[0067] (2) Heat the mixed solution in step (1) to 35°C, add mesotrione, sodium citrate, lotus root starch and acrylic acid, and stir for 18 minutes;

[0068] (3) Let the mixed solution obtained in step (2) stand for cooling, add starch when the temperature reaches 20°C, and stir for 70 minutes;

[0069] (4) Freeze the mixed solution obtained in step (3) in an environment of -20°C for 40 min to obtain a frozen mixed solution;

[0070] (5) Heat the frozen mixed solution obtained in step (4) to 40°C, add maleic acid, p-cresol and mecitrione, stir for 60 min, then continue heating to 90°C, and stir for another 20 min;

[0071] The weight percent of each material used above is: sodium chloride 1.0%; Sodium hydroxide 1.2%; Sodium citrate 1....

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Abstract

The invention discloses a special quenching agent for a large shaft and a preparation method of the quenching agent, belonging to the field of quenching agents. The quenching agent is prepared from the following components: sodium chloride, sodium hydroxide, sodium citrate, cis-butenedioic acid, mesotrione, lotus root starch, acrylic acid, p-cresol, metribuzin and water. Through adding reasonable components and strictly controlling the component proportion, when used for quenching a shaft which is made of 45# steel and has the diameter of 1.8-3.5m, the quenching agent has the following advantages that the workpiece cooling speed is high within the temperature range of 650-450 DEG C, and the cooling speed is low at the temperature of below 400 DEG C, so that a favorable quenching effect can be obtained, and a quenching crack condition can also be avoided. The preparation method of the quenching agent has the advantages that all components in the quenching agent are completely dispersed and uniformly distributed by controlling temperatures and adding sequences of raw materials, the quenching agent is similar to a colloid in shape, and the cooling speed at the temperature of below 400 DEG C is lowered.

Description

technical field [0001] The invention belongs to the field of quenching agent and its processing technology, in particular, it relates to a special quenching agent for large shafts and its manufacturing method, more specifically, it relates to a kind of quenching agent for 45# steel with a diameter of 1.8- Special quenching agent for shafts between 3.5m. Background technique [0002] The performance of the steel after quenching depends on the microstructure of the steel after quenching, and the quenching microstructure is determined by the composition of the steel, the size of the parts and the quenching cooling rate. There are two effective ways to improve the hardening effect of steel parts: one is to increase the alloy element content of raw materials to shift the C curve to the right; the other is to increase the quenching cooling rate. The latter is simple, easy to implement and low in cost, and is an effective way to improve the quenching quality of steel parts. At the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/60C21D9/28
Inventor 丁丹丹王井丽其他发明人请求不公开姓名
Owner 深圳市新元特钢有限公司
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