Self lubricating piston ring material and piston ring for IC engine

Application Number: 00107860
Application Date: 2000.06.26
Publication Number: 1290765
Publication Date: 2001.04.11
Priority Information: 1999/6/25 JP 179537/1999; 2000/3/17 JP 76562/2000
International: C22C38/18;C22C38/60
Applicant(s) Name: Hitachi Metal Co., Ltd.
Inventor(s) Name: Kubota Kunichika;Ono Johiro;Masugata Kaeki
Patent Agency Code: 72002
Patent Agent: guo xiaodong
Abstract There are disclosed a piston ring material and a piston ring both having such superior properties. The piston ring material or the piston ring consists essentially, by mass, of not less than 0.3% but less than 0.8% C, 0.1 to 3.0% Si, 0.1 to 3.0% Mn, 0.03 to 0.3% S, 0.3 to 6.0% Cr, 0 to 3.0% Cu, and the balance Fe, and the distribution state of sulfide inclusions with a maximum diameter/minimum size >= 3 observed on structure parallel to the outer peripheral surface of the formed piston ring is such that an intersecting angle made between straight lines passing the maximum size of two of the sulfide inclusions is not more than 30 degrees.