Patent ID: 8721808

Claim:
A ferrite system heat-resistant cast steel including a ferrite system composition structure consisting of by percent by mass, 0.10% to 0.40% carbon, 0.5% to 2.0% silicon, 0.2% to 1.2% manganese, 0.3% or less phosphorus, 0.01% to 0.4% sulfur, 14.0% to 21.0% chrome, 0.05% to 0.6% niobium, 0.01% to 0.8% aluminum, 0.15% to 2.3% nickel, residual iron and inevitable impurities, wherein the ferrite system composition structure simultaneously includes a first phase formed by ferrite and a second phase formed by a phase in which carbide is mixed in the ferrite crystal grain, and wherein approximately 50% to approximately 80% of the ferrite system composition structure is formed of the second phase.