Nitrocarburizing process for ultra-thin part

Abstract

The invention discloses a nitrocarburizing process for an ultra-thin part. The process comprises the following steps of S1, charging; S2, cleaning, specifically, removing surface grease through alkaline cleaning; S3, preheating at a temperature of 350 DEG C for 30 min; S4, salt bath nitrocarburizing at a temperature of 580 DEG C for 60 min; and obtaining an epsilon-Fe2-3N compound layer with the surface hardness of 450 HV-650 HV on the surface; S5, cooling through water cooling; S6, post-cleaning; S7, carrying out post-treatment through vibration grinding; removing dust scale generated on the surface of a product in a nitriding process to expose the bright, homogeneous and clean surface, and meanwhile removing stamping burrs; and S8, rust prevention, specifically, protecting the product. The salt bath nitrocarburizing process is used for replacing a shallow carburizing and quenching or nitrocarburizing process, the performance requirement is met, and meanwhile the problem of heat treatment deformation is solved.

Description

technical field [0001] The invention relates to the field of heat treatment, in particular to a nitrocarburizing process for extremely thin parts. Background technique [0002] In electrical switches, many metal components are stamped and formed by low-carbon cold-rolled steel sheets, and the processing cost is relatively low. Although the low-carbon cold-rolled steel plate is easy to form, its strength is not high, it is not wear-resistant, and it is not corrosion-resistant. Therefore, it usually requires corresponding heat treatment and surface treatment to achieve its final performance; [0003] The commonly used heat treatment is carburizing or carbonitriding. Due to the high treatment temperature, usually above 850°C, for low-carbon cold-rolled steel sheets with complex switching and extremely thin thickness (thickness is usually less than 1.0mm) , the difficulty of heat treatment is relatively high, and the deformation ratio is high, and it takes more manpower to stra...

AI Technical Summary

Problems solved by technology

Although the low-carbon cold-rolled steel plate is easy to form, its strength is not high, it is not wear-resistant, and it is not corrosion-resistant. Therefore, it usually requires corresponding heat treatment and surface treatment to achieve its final performance;

[0003] The commonly used heat treatment is carburizing or carbonitriding. Due to the high treatment temperature, usually above 850°C, for low-carbon cold-rolled steel sheets with complex switching and extremely thin thickness (thickness is usually less than 1.0mm) , the difficulty of heat treatment is relatively high, and the deformation ratio is high, and it takes more manpower to straighten after heat treatment

At the same time, very thin parts can only allow a very shallow carburized hardened layer, otherwise the material will be obviously brittle due to too deep a carburized layer (such as penetration or near penetration), which is extremely difficult to control heat treatment, and the scrap rate is also high. quite high

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