Patent ID: 9689059
Date: 2017-06-27
CPC Classifications: B22D,C21C,C22C

Claim:
1. A flake graphite cast iron for use with an engine consisting of: 3.05 to 3.25% of carbon (C), 2.1 to 2.4% of silicon (Si), 0.600 to 1.099% of manganese (Mn), 0.09 to 0.13% of sulfur (S), 0.04% or less of phosphorus (P), 0.6 to 0.8% of copper (Cu), 0.2 to 0.4% of molybdenum (Mo), the balance iron (Fe) and other inevitable impurities satisfying 100% as a total weight %, and simultaneously satisfying a chemical composition wherein a ratio (Mn/S) of the content of manganese (Mn) to the content of sulfur (S) is in a range from 7 to 28, a ratio ((Mn/S)/(C/Si)) of the content ratio of manganese and sulfur to the content ratio of carbon and silicon is in a range from 5 to 18, a carbon equivalent (CE) is in a range from 3.8 to 4.0, and a tensile strength of 350 MPa or more.