PISTON RING EXCELLENT IN RESISTANCE TO SCUFFING, CRACKING AND FATIGUE AND METHOD FOR PRODUCING THE SAME, AND COMBINATION OF PISTON RING AND CYLINDER BLOCK

Title:

PISTON RING EXCELLENT IN RESISTANCE TO SCUFFING, CRACKING AND FATIGUE AND METHOD FOR PRODUCING THE SAME, AND COMBINATION OF PISTON RING AND CYLINDER BLOCK

Document Type and Number:

WIPO Patent Application WO/2002/006546

Kind Code:

A1

Abstract:

A piston ring comprised of a high chromium martensitic stainless steel having a nitrided layer on the surface thereof, characterized in that the stainless steel has a chemical composition, in wt %: C: 0.3 to 1.0 %, Cr: 14.0 to 21.0, N: 0.05 to 0.50, the total of one or more of Mo, V, W and Nb: 0.03 to 3.0, Si: 0.1 to 1.0 %, Mn: 0.1 to 1.0 %, P: 0.05 % or less, S: 0.05 % or less, and balance: Fe and inevitable impurities, and the sliding nitrided layer has hard particles mainly comprising nitrides which have an average diameter of 0.2 to 2 µm and a maximum diameter of 7 µm or less and are dispersed on the surface thereof with an area percentage of 5 to 30 %. The high chromium martensitic stainless steel exhibits improved resistance to scuffing, cracking and fatigue.

Inventors:

TAKAHASHI JUNYA (JP)
ONUKI TORU (JP)
INOUE SHIGEO (JP)
SASAKURA MITSUTAKA (JP)

Application Number:

PCT/JP2001/006127

Publication Date:

January 24, 2002

Filing Date:

July 16, 2001

Export Citation:

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Assignee:

RIKEN KK (JP)
TOKUSEN KOGYO COMPANY LTD (JP)
TAKAHASHI JUNYA (JP)
ONUKI TORU (JP)
INOUE SHIGEO (JP)
SASAKURA MITSUTAKA (JP)

International Classes:

C21D8/06; C21D9/40; C21D9/52; C22C38/00; F02F5/00; C22C38/18; C22C38/22; C22C38/24; C22C38/26; C22C38/60; C23C8/26; F16J9/26; (IPC1-7): C22C38/00; C22C38/34; F16J9/26

Foreign References:

JPH08134596A	1996-05-28
JPH07278758A	1995-10-24
JPH01205063A	1989-08-17
JPH11294584A	1999-10-29
JPH05148593A	1993-06-15
JPS61144470A	1986-07-02
JPS59162346A	1984-09-13

Other References: