| 摘要 |
A spheroidal graphite cast iron comprising: C: 3.3 to 4.0 mass%, Si: 2.1 to 2.7 mass%, Mn: 0.20 to 0.50 mass%, S: 0.005 to 0.030 mass%, Cu: 0.20 to 0.50 mass%, Mg: 0.03 to 0.06 mass% and the balance: Fe and inevitable impurities, wherein a tensile strength is 550 MPa or more, and an elongation is 12% or more. |
