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Carbonitriding method for thin-walled steel parts

A carbonitriding and steel technology, applied in coating, metal material coating process, solid-state diffusion coating, etc., can solve the problem of difficult to meet the requirements of use

Active Publication Date: 2018-07-31
厦门真冈热处理有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Therefore, carbonitriding requires special treatment, otherwise, it is difficult to meet the corresponding use requirements

Method used

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  • Carbonitriding method for thin-walled steel parts
  • Carbonitriding method for thin-walled steel parts
  • Carbonitriding method for thin-walled steel parts

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Embodiment Construction

[0023] When the existing method is used for carbonitriding of thin-walled steel parts, the co-carburizing effect is not ideal.

[0024] Thin-walled steel parts take the anchor clip in the clip anchor (YJM, anchor code: Y is prestressed, J is clip type, M is anchor) as an example. Clip anchor is a type of prestressed anchor used in prestressed structural engineering. It is widely used in long-span railways, highways, bridges, dams, construction projects and other geotechnical anchoring projects. The clip-type anchor is composed of anchor ring, anchor clip and anchor plate and other components. The anchor clip is a key element for directly clamping the prestressed steel strand, and its inner surface has inner teeth.

[0025] Usually, it is hoped that through carbonitriding, the surface of the anchor clip will be hard, the core will be tough, and the internal teeth will not break.

[0026] However, because the anchor clip is a small piece, the thickness of the side wall is thin...

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Abstract

A carbonitriding method for thin-walled steel parts comprises the steps of carbonitriding, quenching and tempering. Specifically, as for the step of carbonitriding, adopted atmosphere includes propane, methyl alcohol and ammonia gas, the adopted carbonitriding carbon potential is 1.06+ / -0.03%, the adopted carbonitriding temperature is 870+ / -5 DEG C, and the adopted carbonitriding time is 300+ / -5 min. By means of the carbonitriding method for the thin-walled steel parts, the performance of the thin-walled steel parts can be improved, and the process cost is reduced.

Description

technical field [0001] The invention relates to the field of heat treatment of metal materials, in particular to a carbonitriding method for thin-walled steel parts. Background technique [0002] Carbonitriding is a chemical surface heat treatment process that simultaneously infiltrates carbon and nitrogen into the surface of steel parts. Mainly carburized, with a small amount of nitrogen infiltrated. Compared with carburizing, carbonitriding has the advantages of faster infiltration speed, higher hardenability and tempering resistance of the carburized layer, good wear resistance and fatigue resistance, and lower processing temperature. Therefore, carbon Nitriding is often used instead of carburizing. At the same time, carbonitriding overcomes to a certain extent the shortcomings of the high hardness of the nitriding layer but the shallower carburizing layer, and the lower surface hardness of the carburizing layer although the hardening depth is large. [0003] According...

Claims

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Application Information

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IPC IPC(8): C23C8/32
CPCC23C8/32
Inventor 胡大维张雪梅胡敬华
Owner 厦门真冈热处理有限公司
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