continued from part 1 - Controller General of Patents, Designs, and ...

(12) PATENT APPLICATION PUBLICATION (21) Application No.6555/DELNP/2008 A
(19) INDIA
(22) Date of filing of Application :28/07/2008 (43) Publication Date : 24/10/2008
(54) Title of the invention : "PISTON RING MATERIAL FOR INTERNAL COMBUSTION ENGINE"
(51) International classification :C22C 38/00 (71)Name of Applicant :
(31) Priority Document No :2006-116254 1)HITACHI METALS LTD
(32) Priority Date :20/04/2006
Address of Applicant :2-1, SHIBAURA 1-CHOME,
(33) Name of priority country :Japan
MINATO-KU, TOKYO 1058614 JAPAN. Japan
(86) International Application No :PCT/JP2007/058482 (72)Name of Inventor :
Filing Date
:19/04/2007
1)OHISHI KATSUHIKO
(87) International Publication No :WO 2007/123164 2)UEHARA TOSHIHIRO
(61) Patent of Addition to Application
Number
Filing Date
:NA
:NA
3)KUBOTA KUNICHIKA
(62) Divisional to Application Number :NA
Filing Date
:NA
(57) Abstract :
A piston ring material that when formed into a piston ring product, maintains excellent properties, and that at the production of piston
ring rod, realizes excellent processability and shape stability. There is provided a piston ring material for internal combustion engine
comprising, by mass, 0.5 to less than 0.7% C, l.Oi or less Si, 1.0% or less Mn, 12.0 to 16.0% Cr, 3.0% or less Mo and/or W (Mo +
1/2W), 0.02 to 0.14% N and the balance Fe and unavoidable impurities, wherein the relationship of contained C, N and Cr satisfies the
formulae: 25 < 43.22C (%) + 42.45N (%) ” 0.02Cr (%) < 40, and 0.15 < 0.92C (%) + 0.67N (%)”0.O3Cr (%) < 0.30.
No. of Pages : 34 No. of Claims : 11
The Patent Office Journal 24/10/2008 26023