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Special quenching liquid for preparing large axial forgings from 35CrMo

A technology for quenching liquid and forgings, applied in the direction of quenching agent, manufacturing tools, heat treatment equipment, etc., can solve the problems of uneven internal structure, poor quenching effect, easy cracking, etc., achieve excellent quenching effect, slow heat transfer, avoid The effect of insufficient hardness

Active Publication Date: 2015-03-25
马鞍山金泉工业介质科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of poor quenching effect, insufficient hardness after quenching, uneven internal structure, easy cracking and high cost of the existing quenching agent for large shaft forgings made of 35CrMo steel, the present invention provides a quenching agent for large shaft forgings made of 35CrMo. Special quenching liquid, the cooling rate of the quenching liquid of the present invention is slightly higher than that of quenching oil in the high temperature stage and close to ordinary distilled water, the cooling speed is very slow at Ar1 temperature, and the quenching liquid close to fast oil can make large shaft forgings made of 35CrMo steel in normalizing After quenching, the surface has a uniform cooling rate when it is quenched, and the heat transfer is slow at the low temperature stage, which can effectively release the tissue stress and prevent quenching cracking

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A special quenching liquid for large shaft forgings made of 35CrMo, its composition and mass parts are: polypropylene-methacrylic acid copolymer (referred to as PP-g-GAM, purchased from Hangzhou Tuomu Technology Co., Ltd.) and polypropylene 10 parts of acrylamide mixture (mass ratio of polypropylene-methacrylic acid to polyacrylamide is 1:1), 3 parts of random copolymer of ethylene oxide and propylene oxide (average molecular weight is 20000), polyamide polyethylene 3 parts of diol, 0.4 part of defoamer (polyether, average molecular weight 6000), 5 parts of water, 4 parts of dispersant (polydimethylsiloxane).

[0026] The maximum cooling rate of the quenching liquid in this embodiment can reach 160-180°C / s. When the temperature of the large shaft forging made of 35CrMo steel drops to 300-400°C, the cooling rate can be reduced to 20-30°C / s. The suitable length is 8 - Shaft forgings of 10 meters (400-500mm in diameter).

[0027] In order to obtain above-mentioned materia...

Embodiment 2

[0035] A special quenching liquid for large shaft forgings made of 35CrMo, its composition and mass parts are: polypropylene-methacrylic acid copolymer (referred to as PP-g-GAM, purchased from Hangzhou Tuomu Technology Co., Ltd.) and polypropylene 8 parts of acrylamide mixture (mass ratio of polypropylene-methacrylic acid to polyacrylamide is 1:1), 4 parts of random copolymer of ethylene oxide and propylene oxide (average molecular weight is 25000), polyamide polyethylene 2 parts of diol, 0.5 parts of defoamer (polyether, average molecular weight 8000), 7 parts of water, 2 parts of dispersant (polydimethylsiloxane).

[0036] The maximum cooling rate of the quenching liquid in this embodiment can reach 180-190°C / s, and when the temperature of the large shaft forging made of 35CrMo steel drops to 300-400°C during the quenching process, the cooling rate can be reduced to 20-35°C / s, especially Suitable for shaft forgings with a length of 5-8 meters (diameter of 400-500mm).

[0037]...

Embodiment 3

[0045] A special quenching liquid for large shaft forgings made of 35CrMo, its composition and mass parts are: polypropylene-methacrylic acid copolymer (referred to as PP-g-GAM, purchased from Hangzhou Tuomu Technology Co., Ltd.) and polypropylene 12 parts of acrylamide mixture (mass ratio of polypropylene-methacrylic acid to polyacrylamide is 1:1), 2 parts of random copolymer of ethylene oxide and propylene oxide (average molecular weight is 30000), polyamide polyethylene 4 parts of diol, 0.6 parts of defoamer (polyether, average molecular weight 7000), 3 parts of water, 5 parts of dispersant (polydimethylsiloxane).

[0046] The maximum cooling rate of the quenching liquid can reach 135-155°C / s. When the temperature of the large shaft forging made of 35CrMo steel drops to 300-400°C, the cooling rate of the shaft forging can be reduced to 20-35°C / s. It is especially suitable for the length of Shaft forgings with complex shapes (such as slots and holes) of 8-10 meters.

[0047...

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Abstract

The invention discloses special quenching liquid for preparing large axial forgings from 35CrMo, and belongs to the technical field of heat treatment quenching. The quenching liquid disclosed by the invention is composed of a mixture of polypropylene-methacrylic acid and polyacrylamide, an ethylene oxide and epoxypropane random copolymer, polyamide polyethylene glycol, a defoaming agent and water. The quenching liquid is mainly suitable for quenching large axial forgings prepared from 35CrMo steel, the process is simple, the traditional double-liquid and triple-liquid quenching processes are changed to effectively avoid quenching crack of the large axial forgings of 35CrMo steel, the quenching effect is good, and the defects of common quick quenching oil that the hardness after quenching is insufficient, the internal organizational form is non-uniform and cracking is liable to produce can be overcome.

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 large shaft forgings made of 35CrMo. Background technique [0002] The earliest historical records of the quenching process can be found in the "Clear Water Quenching its Peak" in "Han Shu·Wang Bao Biography". 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, et...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/60C21D1/58
CPCC21D1/58C21D1/60
Inventor 郑益史传喜赵慧郑景亮
Owner 马鞍山金泉工业介质科技有限公司
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