Valve seat ring for the inlet and exhaust valves of internal combustion engines is obtained by powder metallurgy from a composition containing carbon, cobalt, molybdenum, chromium, nickel, manganese, sulfur, and iron as residue

摘要

A valve seat ring obtained by powder metallurgy from a composition containing (wt.%):C (0.8-1.2), Co (16-26), Mo (1.5-2.5), Cr (2.0-3.0), Ni (1.0-2.0), Mn (0.3-0.7), S (0.3-0.7) and Fe (0.3-0.7) as residue. An independent claim is included for a process for preparation of the valve seat from the above composition by powder metallurgy.