Special quenching liquid for 50Mn steel and quenching method of 50Mn steel bearing ring

A technology for bearing rings and quenching liquid, which is applied in the quenching field of 50Mn steel special quenching liquid and 50Mn steel bearing rings, can solve the problems of uneven internal structure, complex components of quenching liquid, high cooling speed, etc. The effect of uniform shape, shortened vapor film stage, and uniform cooling rate

Inactive Publication Date: 2015-07-08
MAANSHAN HUADONG SLEWING BEARING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at problems such as complex components, high cost and high cooling rate of the existing quenching liquid, excessive hardness after quenching, uneven internal structure and quenching cracking, etc., the present invention provides a special quenching liquid for 50Mn steel and 50Mn ste

Method used

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Examples

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Example Embodiment

[0040] Example 1

[0041] A special quenching liquid for 50Mn steel, consisting of water glass, NaOH, sodium chloride and water, wherein the water glass (purchased from Qingdao Dongyue Paohua Soda Co., Ltd., the modulus is 2.4, the degree of Baume is 56) quality The fraction is 19.1%, the mass fraction of NaOH is 1.1%, the mass fraction of sodium chloride is 25.2%, and the balance is water.

[0042] Using the quenching liquid in the present embodiment to quench the 50Mn steel bearing ring (1m in diameter), the steps are:

[0043] (1) prepare quenching liquid, take by weighing water glass, NaOH, sodium chloride and water to prepare 50Mn steel special quenching liquid according to the above ratio;

[0044] (2) Drain the liquid in the quenching tank, rinse the quenching tank system pipeline with a cleaning agent and a water circulation cleaning agent, and after cleaning, dilute the 50Mn steel special quenching liquid prepared in step (1) by 1 times and introduce it into the quen...

Example Embodiment

[0056] Example 2

[0057] A special quenching liquid for 50Mn steel, consisting of water glass, NaOH, sodium chloride and water, wherein the water glass (purchased from Qingdao Dongyue Paohua Soda Co., Ltd., the modulus is 24, and the Baume degree is 56) quality The fraction is 18.1%, the mass fraction of NaOH is 1.3%, the mass fraction of sodium chloride is 26.3%, and the balance is water.

[0058] The 50Mn steel bearing ring (inner diameter is 1.2m) is quenched with the quenching liquid in the present embodiment, and the steps are:

[0059] (1) prepare quenching liquid, take by weighing water glass, NaOH, sodium chloride and water to prepare 50Mn steel special quenching liquid according to the above ratio;

[0060] (2) diluting the special quenching liquid for 50Mn steel prepared in step (1) by 2 times, and then introducing it into a quenching pool for standby use. The quenching pool is provided with a cooling circulation heat dissipation device, and the temperature of the ...

Example Embodiment

[0072] Example 3

[0073] A special quenching liquid for 50Mn steel, consisting of water glass, NaOH, sodium chloride and water, wherein the water glass (purchased from Qingdao Dongyue Paohua Soda Co., Ltd., the modulus is 2.4, the degree of Baume is 56) quality The fraction is 18.5%, the mass fraction of NaOH is 1.2%, the mass fraction of sodium chloride is 25.7%, and the balance is water.

[0074] Use the quenching liquid in the present embodiment to quench the 50Mn steel bearing ring (2.5m in diameter), and the steps are:

[0075] (1) prepare quenching liquid, take water glass, NaOH, sodium chloride and water according to the above proportion to prepare 50Mn steel special quenching liquid;

[0076] (2) dilute the quenching liquid for 50Mn steel prepared in step (1) by 1 times, and then introduce it into a quenching pool for standby use, and the quenching pool is provided with a cooling circulating heat dissipation device, and the temperature of the quenching liquid in the ...

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Abstract

The invention discloses special quenching liquid for 50Mn steel and a quenching method of a 50Mn steel bearing ring, and belongs to the field of heat treatment quenching technologies. The quenching liquid comprises, by mass, 18.1-19.1% of water glass, 1.1-1.3% of NaOH, 25.2-26.3% of sodium chloride and the balance of water, wherein the modulus of the water glass is 2.4, and the baume degree of the water glass is 56. The quenching liquid has the advantages of being uniform in cooling speed, good in quenching performance and dispersity, high in storage stability and not prone to deterioration. The 50Mn steel bearing ring quenched through the quenching method has a deep quenching layer and is uniform in quenching hardness, uniform in internal structural form and free of quenching cracks.

Description

technical field [0001] The invention belongs to the technical field of heat treatment and quenching, and more specifically relates to a special quenching liquid for 50Mn steel and a quenching method for bearing rings of 50Mn steel. Background technique [0002] In 1863, a British metallographer and geologist showed six different metallographic structures of steel under a microscope, proving that when steel is heated and cooled, the internal structure will change, and the phase at high temperature in the steel will transform when it is quenched as a harder phase. Therefore, metals usually use heat treatment to improve the strength and metallographic structure of the metal to obtain the desired properties, and the quenching medium is one of the key factors to obtain high quenching quality. Commonly used quenching mediums include brine, water, Mineral oil, air, etc. The traditional water-soluble quenching medium has a very high cooling rate. Excessively high cooling rate will...

Claims

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Application Information

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IPC IPC(8): C21D1/60C21D1/18C21D9/40
CPCC21D1/18C21D1/60C21D9/40
Inventor 虞洪流何平
Owner MAANSHAN HUADONG SLEWING BEARING
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