High resistance gray iron alloy for combustion engines and general casts

摘要

The object of this application defines a new alloy which presents at the same time the mechanical and physical properties of the gray iron alloy, i.e., excellent machinability, damping vibration, thermal conductivity, low shrink tendency and good microstructure stability, together with a wide interface range of the CGI tensile strength.

主权项

1. A high resistance gray iron alloy comprising, in weight, iron and
C in an amount of 2.8% to 3.2%; Si in an amount of 2.0% to 2.40%; Mn in an amount of 0.4% to 0.5% and S in an amount defined in specific ranges by a ratio Mn/S:
when Mn is 0.40% Mn/S is 3.3 to 3.9when Mn is 0.47% Mn/S is 4.0 to 5.0;when Mn is 0.50% Mn/S is 4.9 to 6.0; Cr in an amount of 0.4% maximum and dependent upon an amount of Mo, wherein Cr+Mo is less than or equal to 0.65%; Sn and Cu in amounts satisfying 0.010%