Title (en)

Method for producing gears and/or shaft components with superior bending fatigue strength and pitting fatigue life from conventional alloy steel

Title (de)

Verfahren zur Herstellung von Getrieben und/oder Achsen, die verbesserte Biegedauerfestigkeit und Dauerlochfrassfestigkeit als bisherige legierte Stähle aufweisen.

Title (fr)

Procédé pour produire des engrenages et/ou des arbres présentant une résistance a la fatigue en flexion et a la fatigue piqures supérieure à celle des aciers conventionelles.

Publication

EP 1516940 A1 20050323 (EN)

Application

EP 03026668 A 20031119

Priority

IN 975BO2003 A 20030918

Abstract (en)

The present invention is directed to a method for producing steel components such as gears and/or shafts of superior bending fatigue strength and pitting fatigue life. According to the present invention said components are made from a steel material , comprising <TABLE> balance iron including impurities, produced in vacuum degassing and alike routes. wherein these components are subjected to a method comprising in sequence the steps of subjecting said steel components to a process of modified Carbonitriding treatment, and subjecting said steel components to a process of Hard Shot Peening. <IMAGE>

IPC 1-7

C23C 8/32; C21D 6/00; C21D 9/28; C21D 9/32

IPC 8 full level

C21D 7/06 (2006.01); C23C 8/32 (2006.01); C23C 8/80 (2006.01); C21D 9/28 (2006.01); C21D 9/32 (2006.01)

CPC (source: EP)

C21D 7/06 (2013.01); C23C 8/32 (2013.01); C23C 8/80 (2013.01); C21D 9/28 (2013.01); C21D 9/32 (2013.01)

Citation (search report)

• [X] US 5595610 A 19970121 - MAEDA HISAO [JP], et al
• [XD] US 5595613 A 19970121 - HATANO ATSUMI [JP], et al
• [X] EP 0950723 A1 19991020 - KOMATSU MFG CO LTD [JP]
• [X] PATENT ABSTRACTS OF JAPAN vol. 1995, no. 10 30 November 1995 (1995-11-30)
• [X] PATENT ABSTRACTS OF JAPAN vol. 1998, no. 11 30 September 1998 (1998-09-30)
• [X] PATENT ABSTRACTS OF JAPAN vol. 1996, no. 09 30 September 1996 (1996-09-30)
• [X] PATENT ABSTRACTS OF JAPAN vol. 1998, no. 03 27 February 1998 (1998-02-27)
• [X] PATENT ABSTRACTS OF JAPAN vol. 2000, no. 08 6 October 2000 (2000-10-06)

Designated contracting state (EPC)

AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR

DOCDB simple family (publication)

EP 1516940 A1 20050323; EP 1516940 B1 20100915; AT E481510 T1 20101015; DE 60334216 D1 20101028

DOCDB simple family (application)

EP 03026668 A 20031119; AT 03026668 T 20031119; DE 60334216 T 20031119