IRON STEEL MEMBER HAVING NITROGEN COMPOUND LAYER, AND PROCESS FOR PRODUCTION THEREOF

Title:

IRON STEEL MEMBER HAVING NITROGEN COMPOUND LAYER, AND PROCESS FOR PRODUCTION THEREOF

Document Type and Number:

WIPO Patent Application WO/2012/035900

Kind Code:

A1

Abstract:

[Problem] To provide a means which ensures a nitrogen compound layer to remain uniformly even on an object having a complex shape such as a gear tooth surface (e.g., a mechanical structural part) and also ensures the formation of a fine martensite, and therefore can impart excellent mechanical strength including bearing strength, wear resistance and bending fatigue strength to the object having a complex shape after high-frequency hardening. [Solution] A method for subjecting an iron steel material to a combined heat treatment of a nitriding treatment and a high-frequency hardening treatment, which is characterized by, prior to the high-frequency hardening treatment after the nitriding treatment, additionally involving a treatment step of forming an oxide layer having a thickness of 0.1 to 5 μm on the surface side on a nitrogen compound layer formed on an iron steel by the nitriding treatment at 600°C or lower, and is also characterized in that the high-frequency hardening treatment is carried out under such conditions that the nitrogen compound layer having hardness of HV 550 or more and a thickness of 1 μm or more is remained on the surface layer of the iron steel material.

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Inventors:

KONISHI TOMOYOSHI (JP)
IKEDA YOSHIHIRO (JP)
BEPPU MASAAKI (JP)

Application Number:

PCT/JP2011/067425

Publication Date:

March 22, 2012

Filing Date:

July 29, 2011

Export Citation:

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Assignee:

NIHON PARKERIZING (JP)
KONISHI TOMOYOSHI (JP)
IKEDA YOSHIHIRO (JP)
BEPPU MASAAKI (JP)

International Classes:

C23C8/14; C21D1/06; C21D1/10; C21D6/00; C23C8/26; C23C8/40; C23C8/50; C23C8/80

Foreign References:

JPS58126977A	1983-07-28
JPS6036658A	1985-02-25
JPS61253359A	1986-11-11
JPH07310731A	1995-11-28

Attorney, Agent or Firm:

ITOH, ATSUSHI (JP)
Atsushi Ito (JP)

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