High-temperature carburizing, slow-cooling, quenching and tempering heat treatment method for engineering machinery track pin bush

A heat treatment method and high-temperature carburizing technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of long carburizing time, intergranular oxidation of the metallographic structure on the surface of the carburized layer, and low temperature carburizing temperature. The effect of reducing intergranular oxidation, increasing carburizing speed, and good service performance

Pending Publication Date: 2020-11-20
TIANJIN CHUANGZHEN METAL TECH
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Problems solved by technology

Due to the low temperature and long carburizing time in the controlled atmosphere, there is a serious problem of intergranular oxidation in the metallographic structure of the surface of the carburized layer.

Method used

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  • High-temperature carburizing, slow-cooling, quenching and tempering heat treatment method for engineering machinery track pin bush
  • High-temperature carburizing, slow-cooling, quenching and tempering heat treatment method for engineering machinery track pin bush
  • High-temperature carburizing, slow-cooling, quenching and tempering heat treatment method for engineering machinery track pin bush

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Embodiment Construction

[0025] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0026] The best embodiment 1 is high-temperature carburizing and slow cooling in a double-chamber controllable atmosphere carburizing furnace, and its heat treatment process is as follows figure 1 shown. First, heat the construction machinery crawler pin sleeve workpiece prepared for high-temperature carburizing of low-carbon alloy steel, and automatically feed the carburizing carrier gas until the carburizing process is over; when the temperature reaches the first-stage carburizing temperature of 960-980°C , keep warm for 30-40min, then enter the first high-temperature carburizing and strong infiltration stage, keep warm for 230-260min, during which carburizing enriched gas and air are automatically introduced into the furnace to adjust the carbon potential in the furnace to maintain CP 1.5-1.7% ;After the intensive infiltration, it enters t...

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Abstract

The invention relates to a high-temperature carburizing, slow-cooling, quenching and tempering heat treatment method for an engineering machinery track pin bush. The method comprises the following processes of high-temperature carburizing in a controllable atmosphere, slow cooling after carburizing, reheating quenching, tempering and the like. According to the method, the high-temperature carburizing time is shortened by 30%-40% compared with the medium-temperature carburizing time, energy is saved, consumption is reduced, accurate control over the depth of a carburized layer is achieved, intergranular oxidation can be reduced, and a prepared part has good service performance on heavy-load engineering machinery.

Description

technical field [0001] The invention relates to a high-temperature carburizing, slow cooling, quenching, and tempering heat treatment method for a track pin sleeve of an engineering machinery, and belongs to the technical field of metal material heat treatment. Background technique [0002] Most of the existing construction machinery track pin bushings are parts made of low-carbon alloy steel. Initially, the construction machinery track pin bushings were originally parts imported from abroad in my country. The heat treatment process is "batch overall carburizing and slow cooling + single-piece induction hardening Tempering", after being converted to localization, in order to improve efficiency and reduce production costs, the heat treatment production process initially adopted the "batch overall controllable atmosphere carburizing slow cooling + batch overall quenching and tempering" process method instead of "batch overall carburizing slow cooling +Single piece induction hard...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/22C21D1/18C21D9/00
CPCC23C8/22C21D1/18C21D9/0068
Inventor 于铁生张冬来
Owner TIANJIN CHUANGZHEN METAL TECH
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