Title:
CAST IRON AND PISTON RING
Document Type and Number:
WIPO Patent Application WO/1997/032049
Kind Code:
A1
Abstract:
A cast iron piston ring which has excellent abrasion resistance and seizing resistance and does not abrade a low-hardness, flaky graphite cast iron liner having a hardness of HRB 85 to 95. Composition: cast iron comprising C: 3.0 to 3.5 %; Si: 2.2 to 3.2 %; Mn: 0.4 to 1.0 %; P: not more than 0.2 %; S: not more than 0.12 %; Cr: 0.1 to 0.3 %; V: 0.05 to 0.2 %; Ni: 0.8 to 1.2 %; Mo: 0.5 to 1.2 %; Cu: 0.5 to 1.2 %; and B: 0.05 to 0.1 %. Texture: undissolved carbide and fine graphite having a percentage area of 2 to 10 % being dispersed in one or two substrates of tempered martensite or bainite. Hardness: HRC 32 to 45.
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Inventors:
MIWA TETSUYA (JP)
Application Number:
PCT/JP1997/000565
Publication Date:
September 04, 1997
Filing Date:
February 27, 1997
Export Citation:
Assignee:
RIKEN KK (JP)
MIWA TETSUYA (JP)
MIWA TETSUYA (JP)
International Classes:
C21D5/00; B23P15/06; C22C37/00; C22C37/04; C22C37/08; C22C37/10; F02F5/00; F16J9/26; C21D9/40; (IPC1-7): C22C37/00
Foreign References:
| JPS6119759A | 1986-01-28 |
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