Nitriding method, and nitrided component manufacturing method

A technology of nitriding treatment and gas nitriding, which is applied in the direction of coating, metal material coating process, solid-state diffusion coating, etc., can solve the problems of insufficient hardened layer depth and increased man-hours of fixture operations, etc.

Inactive Publication Date: 2016-08-17
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, depending on the required properties, a sufficient hardened layer depth may not be obtained
In addition, as in the proposal in Patent Document 2, when a non-nitriding jig is prepared for fluoridation treatment, new problems arise in the selection of jigs and the increase in man-hours.

Method used

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  • Nitriding method, and nitrided component manufacturing method
  • Nitriding method, and nitrided component manufacturing method
  • Nitriding method, and nitrided component manufacturing method

Examples

Experimental program
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Embodiment

[0127] JIS standard SCr420 (JIS G 4053 alloy steel steel for machine structure) and S45C (JIS G 4051 carbon steel steel for machine structure) were melted in a 50 kg vacuum melting furnace to produce molten steel. Molten steel is cast to create ingots. The ingot was hot forged to produce a steel bar with a diameter of 20 mm.

[0128] For bar steel of SCr420, quenching and tempering are performed after performing normalizing treatment in order to homogenize the structure. In the normalizing treatment, the bar steel was heated to 920° C., held for 30 minutes, and then air-cooled. In the quenching treatment, the bar steel was heated to 900° C., held for 30 minutes, and then water-cooled. During the tempering treatment, the steel bar was kept at 600° C. for 1 hour.

[0129] For the steel bar of S45C, it is heated to 870°C and kept for 30 minutes, and then air cooled.

[0130] A test piece of 15 mm x 80 mm x 5 mm was collected from the produced bar steel by machining.

[0131]...

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Abstract

Provided is a nitriding method, for a low-alloy steel, that can ensure a uniform hardened-layer depth and can inhibit generation of a compound layer. A low-alloy steel is heated to 550-620 DEG C, total processing time A is set to 1.5-10 hours, and high KN value processing and low KN value processing are carried out. In the high KN value processing, the nitriding potential KNX in formula (1) is 0.15-1.50, the average value KNXave of KNX is 0.30-0.80, and processing time is X-hours. The low KN value processing is carried out after the high KN value processing is carried out, and the nitriding potential KNY in formula (1) is 0.02-0.25, the average value KNYave of KNY is 0.03-0.20, and processing time is Y-hours. The nitriding potential average value KNave determined according to formula (2) is 0.07-0.30. Formula (1): KNi=(NH3 partial pressure) / [(H2 partial pressure)3 / 2]. Formula (2): KNave=(X*KNXave+Y*KNYave) / A. Here, i is X or Y.

Description

technical field [0001] The present invention relates to a nitriding treatment method and a method for manufacturing a nitrided component, and more specifically, relates to a method for nitriding low-alloy steel and a method for manufacturing a nitrided component. Background technique [0002] For steel parts used in automobiles, various industrial machines, etc., in order to improve mechanical properties such as fatigue strength, wear resistance, and adhesive wear resistance, the surface is subjected to carburizing and quenching, induction hardening, nitriding, and soft nitriding. Hardening heat treatment. Nitriding treatment and nitrocarburizing treatment at a heating temperature of A 1 The ferrite region below the point is heat treated without using phase transformation. As a result, heat treatment deformation can be reduced. Therefore, nitriding and nitrocarburizing are often used for parts with high dimensional accuracy, large parts such as gears used in transmission ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/26C21D1/06
CPCC21D1/06C21D1/76C23C8/26
Inventor 梅原崇秀大藤善弘
Owner NIPPON STEEL CORP
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