Title:
WIRE FOR PISTON RINGS
Document Type and Number:
WIPO Patent Application WO/2014/054130
Kind Code:
A1
Abstract:
Provided is a wire for piston rings with which variation in the width of the piston ring gap is reduced, workability during coiling is excellent, and which can be manufactured at low cost. This wire for piston rings is obtained from steel comprising 0.50 mass% to 0.80 mass% of C, 1.00 mass% or less of Si, 1.00 mass% or less of Mn, 11.0 mass% to 14.0 mass% of Cr, 0.20 mass% to 2.0 mass% of Mo, and unavoidable impurities. The area ratio of carbide particles with an equivalent circle diameter of 0.2 µm to 5 µm is 10% or less in the structure of a transverse cross-section, and the Vickers hardness is 350 to 450. The wire is manufactured by undergoing hardening and tempering and the tempering temperature is 645°C or more.
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Inventors:
KAMON RYOUICHI
MIZUNO YUKITAKA
MIZUNO YUKITAKA
Application Number:
PCT/JP2012/075643
Publication Date:
April 10, 2014
Filing Date:
October 03, 2012
Export Citation:
Assignee:
TOKUSEN KOGYO KK (JP)
NIPPON KOSHUHA STEEL CO LTD (JP)
NIPPON KOSHUHA STEEL CO LTD (JP)
International Classes:
C21D9/52; C22C38/00; C22C38/22; C22C38/24; F16J9/26
Domestic Patent References:
| WO2007123164A1 | 2007-11-01 |
Foreign References:
| JPH11106874A | 1999-04-20 | |||
| JP2008057478A | 2008-03-13 | |||
| JPH06221436A | 1994-08-09 | |||
| JPS5845357A | 1983-03-16 | |||
| JP2005344134A | 2005-12-15 |
Other References:
See also references of EP 2905352A4
Attorney, Agent or Firm:
OKA Kengo et al. (JP)
岡 Kengo (JP)
岡 Kengo (JP)
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