NITRIDABLE STEEL PISTON RINGS AND STEEL CYLINDER LINERS, AND CASTING PROCESS FOR THE PRODUCTION THEREOF

摘要

A steel piston ring and a steel cylinder liner are described which comprise as the main body a steel composition which has good nitridability. The steel composition consists of the following elements: 0 - 0.5 weight % B, 0.5 - 1.2 weight % C, 4.0-20.0 weight % Cr, 0 - 2.0 weight % Cu, 45.30-91.25 weight % Fe, 0.1 - 3.0 weight % Mn, 0.1 - 3.0 weight % Mo, 0 - 0.05 weight % Nb, 2.0 - 12.0 weight % Ni, 0-0.1 weight % P, 0-0.05 weight % Pb, 0-0.05 weight % S, 2.0 - 10.0 weight % Si, 0-0.05 weight % Sn, 0.05 - 2.0 weight % V, 0 - 0.2 weight % Ti and 0 - 0.5 weight % W. The steel piston ring and the steel cylinder liner can be manufactured in a casting process using the machinery and technology employed for the manufacture of cast iron parts.