Free-cutting steel part and manufacturing method thereof

A technology of free-cutting steel and manufacturing methods, which is applied in the direction of coating, layered products, metal material coating technology, etc., and can solve the problems of uneven surface hardness of free-cutting steel parts and the inability to achieve surface properties, etc.

Active Publication Date: 2012-10-17
鑫光热处理工业(昆山)有限公司
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Problems solved by technology

[0004] Carbonitriding is a relatively common method that can improve surface properties. Generally, carbonitriding includes a stage of strong infiltration with a higher carbon potential and a stage of diffusion with a lower carbon potential. However, due to the initial carbonitriding layer A large amount of nitrogen is inhaled. In the later stage of carbonitriding, due to the increase of carbon concentration, the process of nitride decomposition and denitrification occurs...

Method used

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  • Free-cutting steel part and manufacturing method thereof
  • Free-cutting steel part and manufacturing method thereof
  • Free-cutting steel part and manufacturing method thereof

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Embodiment Construction

[0031] The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.

[0032] refer to image 3 As shown, a free-cutting steel part of the present invention mainly includes two parts, a matrix and a strengthening layer, wherein the strengthening layer is formed by post-heat treatment of the matrix.

[0033] Specifically, the matrix component and structure are equivalent to carbon steel containing free-cutting elements, that is, equivalent to the untreated free-cutting steel billet itself, so it can inherit the excellent performance of free-cutting steel itself, making the present invention Free-machining steel parts have better internal strength and toughness.

[0034] As a preferred solution, the free-machining elements in the matrix include: one or more of sulfur, phosphorus, and lead.

[0035] refer to Figure 4 with Figure 5 , we can see that the strengthening layer of the present invention contains...

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Abstract

The invention discloses a free-cutting steel part and a manufacturing method thereof. The free-cutting steel part comprises a matrix and a reinforcing layer, wherein the matrix contains more than one free-cutting elements, and the reinforcing layer contains carbon and nitrogen elements; and the method disclosed by the invention is implemented mainly by using a mode of carrying out carburization firstly and then carrying out carbonitriding, and optimized parameters and processes are adopted. The free-cutting steel part and manufacturing method thereof disclosed by the invention have the beneficial effects that the defect that nitrogen atoms are changed into nitrogen molecules so as to form holes and black tissues as nitrides are decomposed and removed caused by increment of the carbon concentration can be avoided, and the surface performance is good.

Description

technical field [0001] The invention relates to a steel part and a manufacturing method thereof, in particular to a free-cutting steel part and a manufacturing method thereof. Background technique [0002] Free-cutting steel is an alloy steel that adds a certain amount of one or more than one free-cutting elements to the steel to improve its machinability. Also known as automatic machine tool processing steel, referred to as automatic steel. This type of steel can be cut with higher cutting speed and larger depth of cut. Due to the easy-cutting elements added to the steel, the cutting resistance of the steel is reduced. At the same time, the characteristics of the easy-cutting elements themselves and the compounds formed play the role of lubricating the cutting tool, which is easy to break chips and reduce wear, thereby reducing the surface of the workpiece. roughness, improving tool life and productivity. [0003] In order to improve the surface properties of parts made ...

Claims

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Application Information

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IPC IPC(8): C23C8/32C21D1/18C23F17/00B32B9/00
Inventor 尧伊继
Owner 鑫光热处理工业(昆山)有限公司
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