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Low-carbon alloy steel vacuum carburizing technology

A low-carbon alloy steel and vacuum carburizing technology, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of a large number of carbides, so as to improve the service life and avoid subsequent fracture and cracking Effect

Active Publication Date: 2020-08-14
湖南特科能热处理有限公司
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Problems solved by technology

This material is generally heat treated by carburizing and quenching, but this material is very easy to form a large number of carbides

Method used

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  • Low-carbon alloy steel vacuum carburizing technology
  • Low-carbon alloy steel vacuum carburizing technology

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Embodiment 1

[0038] Such as figure 1 Carburizing and quenching the electric tool parts produced by a certain company. The material is low-carbon alloy steel 20Cr2Ni4 (carbon 0.17-0.23%). After cleaning the product, it starts carburizing and quenching. After reaching 900±5°C, soak for 45 minutes, and then carry out carburizing diffusion. The first stage of carburizing diffusion is 46 minutes and 118 minutes. The acetylene is 12L / pulse, a total of 22 pulses, each pulse of acetylene is passed through for 10s , the interval is 115s, the second stage of carburizing is also 12L / pulse of acetylene, the time is 65 minutes, each pulse of acetylene is passed through for 10s, the interval is 290s, a total of 13 pulses, and then the temperature is raised to 920±5°C and diffused for 180 minutes, and finally the temperature is lowered to 830±5℃ for 30 minutes, then oil cooling, quenching oil temperature 60±5℃, keep in oil for 20 minutes. Nitrogen protection is carried out during the cooling stage and q...

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Abstract

The invention discloses a low-carbon alloy steel vacuum carburizing technology. Pulse type vacuum carburizing equipment is adopted for carburizing. The low-carbon alloy steel vacuum carburizing technology comprises the following steps that firstly, low-carbon alloy steel is heated to 900+ / -5 DEG C for soaking; secondly, at the soaking temperature, first-section carburizing, diffusion and second-section carburizing are conducted, and then temperature rise is conducted to 920+ / -5 DEG C for second-section diffusion; first-section carburizing is conducted for 42-50 min, diffusion is conducted for115-122 min, second-section carburizing is conducted for 60-70 min, second-section diffusion is conducted for 160-200 min, and pulse type infiltration of a carburizer is adopted in first-section carburizing and second-section carburizing; and thirdly, cooling is conducted to 830+ / -5 DEG C, and quenching is conducted after heat preservation. By adoption of the technology, the surface is free of oxidation after heat treatment, carbide is in the level of 1-2, accordingly, the later fracture and crack risk of products is avoided, and the service life of the products is prolonged.

Description

technical field [0001] The invention relates to a heat treatment method for low-carbon alloy steel, in particular to a vacuum carburizing process for low-carbon alloy steel. Background technique [0002] At present, the reason why many power tool parts need to work for a long time requires high strength. At the same time, due to the requirements of the working method, in addition to maintaining strength, they also need strong toughness to ensure that the product will not be brittle. Therefore, this kind of parts generally Low carbon alloy steel material will be used. This kind of material is generally heat treated by carburizing and quenching, but this kind of material is very easy to form a large number of carbides. Due to the high requirements on the surface of the part, after heat treatment, it is necessary not only to have no internal oxidation on the surface to avoid microcracks, but also to ensure that the surface carbon concentration is appropriate and not produce a ...

Claims

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Application Information

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IPC IPC(8): C23C8/22C21D1/18C21D1/74
CPCC23C8/22C21D1/18C21D1/74
Inventor 郭亮乾杉山辉阳
Owner 湖南特科能热处理有限公司
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