Heat treatment method for steel pieces

A heat treatment method and technology for steel parts, which can be used in coatings, metal material coating processes, solid-state diffusion coatings, etc. The effect of comprehensive service life, reduction of workpiece deformation, and reduction of production costs

Inactive Publication Date: 2011-03-30
顾安民
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Only the improvement of the surface hardness and wear resistance of the parts is limited. In addition, due to th...

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Embodiment Construction

[0010] Further provide following embodiment in conjunction with content of the present invention:

[0011] Taking cylindrical steel parts as an example, the center of the outer circle is 160mm, the inner circle is 100mm smaller, and the height is 230mm. On the upper part of the outer circle, grooves with a width of 30mm, a depth of 10mm and a length of 40mm are evenly distributed along the circumferential direction. The material is 20 carbon structural steel, and the surface hardness is > 700HV , The depth of the infiltration layer is required to be 0.3mm. Parts are processed in a sealed well-type furnace. The first stage is carbonitriding. The infiltration agent can be methanol, acetone and ammonia, and the temperature is 830°C. After three hours, it starts to cool down to 620°C for austenitic nitriding. hours, control the nitrogen decomposition rate to 70%, and obtain an austenite layer with high nitrogen content; then quench and stay in an austenitic quenching tank at 250°C...

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Abstract

The invention discloses a heat treatment method for steel pieces, and relates to improvement of a heat treatment method for surfaces of steel pieces. The heat treatment method makes the steel pieces improve the depth of an austenite nitriding/carbonitriding layer and reduce deformation, integrates and fully exerts the advantages of various processes, and overcomes respective disadvantages to complement one another so as to achieve excellent comprehensive usability. In the treatment method for compounding chemical heat treatment (such as carburizing or carbonitriding) and austenite nitriding or austenite carbonitriding technology, a workpiece is heated to be in an austenite state for carburizing or carbonitriding, a preset layer is obtained, and the temperature in the same furnace is reduced to the austenite nitriding temperature between 620 and 720 DEG C for nitriding or carbonitriding treatment, so that the nitrogen concentration on the surface of the workpiece reaches the nitrogen concentration of austenite and the level of the austenite nitriding layer is improved; and the workpiece is directly quenched and aged or directly subjected to isothermal quenching, so that the high-nitrogen austenite is decomposed and high surface hardness and wear resistance are achieved.

Description

Technical field: [0001] The present invention relates to an improvement of a heat treatment method. technical background: [0002] At present, carburizing or carbonitriding is commonly used in the heat treatment process of steel parts. It has high hardness and wear resistance, the highest hardness is 56-62HRC, equivalent to 600-750HV, and it can obtain lower martensite (or bainite, sorbite) and other structures, with certain toughness , so it has been widely used. Only the improvement of the surface hardness and wear resistance of the parts is limited. In addition, due to the temperature A higher value will cause greater deformation of the part and a greater amount of subsequent processing. In order to increase the effective hardened layer depth of steel parts after heat treatment; after continuous exploration and research, it is believed that the composite heat treatment method of increasing the depth of austenitic nitriding / nitrocarburizing layer and reducing deformatio...

Claims

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Application Information

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IPC IPC(8): C23F17/00C23C8/34C21D1/18C21D10/00
Inventor 顾安民
Owner 顾安民
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