Carburizing heat treatment process of alloy steel casting

A technology of alloy steel and carburizing, which is applied in the field of carburizing heat treatment of alloy steel castings, can solve the problems of weakening the bonding force between metals, reducing the wear resistance of steel, and reducing impact toughness, so as to avoid reticular cementite and The effect of increasing retained austenite, reducing carbon potential, and improving wear resistance and hardness

Inactive Publication Date: 2019-08-30
晋江鹏发机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing carburizing heat treatment process is easy to generate a large number of network carbides, the existence of network carbides weakens the bonding force between metals and reduces the mechanical properties of steel. In particular, the impact toughness decreases and the brittleness increases, which can easily cause intergranular cracking and reduce the wear resistance of steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The present embodiment provides a carburizing heat treatment process for a 20CrNiMo alloy steel casting, which specifically includes the following steps:

[0022] S1. Take the casting, turn it on the carburized working surface of the casting to remove the adsorption layer, oxide layer and processing strain layer, then clean it in a vacuum hydrocarbon solvent cleaning machine, and then perform anti-seepage treatment on the non-carburized working surface of the casting , specifically adopt the anti-seepage coating method: take 66 parts by weight of talcum powder and 34 parts by weight of kaolin, mix it into a paste with water glass, apply it on the non-carburized working surface, brush it twice, and then dry it. At the same time, the working surface after turning is plated with a non-copper metal film, and the non-copper metal film is a Ni-Fe alloy film, wherein the mass ratio of the Ni-Fe alloy composition is Ni: Fe=19: 81, and the film thickness is 8 μm ;

[0023] S2. ...

Embodiment 2

[0029] The present embodiment provides a carburizing heat treatment process for a 20CrMnTi alloy steel casting, which specifically includes the following steps:

[0030] S1. Take the casting, turn it on the carburized working surface of the casting to remove the adsorption layer, oxide layer and processing strain layer, then clean it in a vacuum hydrocarbon solvent cleaning machine, and then perform anti-seepage treatment on the non-carburized working surface of the casting , specifically adopt the anti-seepage coating method: take 66 parts by weight of talcum powder and 34 parts by weight of kaolin, mix it into a paste with water glass, apply it on the non-carburized working surface, brush it twice, and then dry it. At the same time, the working surface after turning is plated with a non-copper metal film, and the non-copper metal film is a Ni-Fe alloy film, wherein the mass ratio of the Ni-Fe alloy composition is Ni: Fe=19: 81, and the film thickness is 5 μm ;

[0031] S2. ...

Embodiment 3

[0037] This embodiment provides a carburizing heat treatment process for 18Cr2Ni4WA alloy steel castings, which specifically includes the following steps:

[0038] S1. Take the casting, turn it on the carburized working surface of the casting to remove the adsorption layer, oxide layer and processing strain layer, then clean it in a vacuum hydrocarbon solvent cleaning machine, and then perform anti-seepage treatment on the non-carburized working surface of the casting , specifically adopt the anti-seepage coating method: take 66 parts by weight of talcum powder and 34 parts by weight of kaolin, mix it into a paste with water glass, apply it on the non-carburized working surface, brush it twice, and then dry it. At the same time, the working surface after turning is plated with a non-copper metal film, and the non-copper metal film is a Ni-Fe alloy film, wherein the mass ratio of the Ni-Fe alloy composition is Ni: Fe=19: 81, and the film thickness is 16 μm ;

[0039] S2. Furna...

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Abstract

The invention relates to a carburization heat treatment process of an alloy steel casting. The carburization heat treatment process specifically comprises the following steps that S1, the carburized working surface of the casting is turned to remove the adsorption layer, the oxidation layer and the machining strain layer, the non-carburized working surface of the casting is subjected to anti-seepage treatment after cleaned, and a layer of non-copper metal film is plated on the working surface after turning; S2, a furnace is installed, gas is discharged, and the methanol and acetone are selected the carburization medium; S3, heating is carried out until the carburizing temperature is subjected to first carburizing, the carbon potential is 1.0+ / -0.05%, and then oil quenching is carried outto be below Ac1; S4, the carburizing temperature is rapidly heated to carry out secondary carburization, the carbon potential is 0.75 + / -0.05%, then the furnace is cooled to 800-820 DEG C, and thetemperature is kept constant; S5, the steps S3 and S4 are repeatedly circulated for multiple times, the coasting is slowly cooling to 350-400 DEG C, the casting is subjected air cooling after being discharged from the furnace, and then the quenching and low-temperature tempering are carried out. By adopting the scheme, the carburized layer does not generate the network carbide, so that the hardness and wear resistance of the surface of a workpiece are improved.

Description

technical field [0001] The invention relates to the technical field of casting heat treatment, in particular to a carburizing heat treatment process for alloy steel castings. Background technique [0002] Carburizing of steel is a chemical heat treatment process in which the carbon content of the surface layer of the steel workpiece is increased and a certain carbon content gradient is formed in it, and the workpiece is heated and kept warm in the carburizing medium to allow carbon atoms to infiltrate. After carburizing, quenching and tempering, the surface of the workpiece can obtain high hardness, strength, wear resistance and fatigue strength, while the core of the workpiece still maintains a certain degree of toughness. Common carburizing steels include Q215, 08, 8CrNiMo and so on. The existing carburizing heat treatment process is easy to generate a large number of network carbides, the existence of network carbides weakens the bonding force between metals and reduces ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/22C21D1/18C23C8/02
CPCC21D1/18C23C8/02C23C8/22
Inventor 杨婷婷
Owner 晋江鹏发机械有限公司
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