Abstract: A high-strength, high-damping-capacity cast iron having both a high strength and high vibration damping capacity is provided. The high-strength, high-damping-capacity cast iron is obtained by a method including performing a graphite spheroidizing treatment on a molten metal, and consists of 2% to 4% of C, 1% to 5% of Si, 0.2% to 0.9% of Mn, 0.1% or less of P, 0.1% or less of S, 3% to 7% of Al, 0% to 1% of Sb, 0% to 0.5% of Sn, 0.02% to 0.10% of Mg, 01% to 0.5% of RE (Ce, La), Fe as balance, and unavoidable impurity.

Abstract: A method for treating molten cast iron includes, performing an inoculation treatment to the molten cast iron, with the use of an inoculant containing: 15 to 80 wt % Si; either 80 to 100 wt % purity La or 80 to 100 wt % purity Ce as RE; Ca; Al; and the balance Fe with inevitable impurities, by adding the inoculant to the molten cast iron such that: the addition amount of La or Ce relative to the molten cast iron is 0.001 to 0.009 wt %; the addition amount of Ca relative to the molten cast iron is 0.001 to 0.02 wt %; and the addition amount of Al relative to the molten cast iron is 0.001 to 0.02 wt %.

Abstract: A high-strength, high-damping-capacity cast iron having both a high strength and high vibration damping capacity is provided. The high-strength, high-damping-capacity cast iron is obtained by a method including performing a graphite spheroidizing treatment on a molten metal, and consists of 2% to 4% of C, 1% to 5% of Si, 0.2% to 0.9% of Mn, 0.1% or less of P, 0.1% or less of S, 3% to 7% of Al, 0% to 1% of Sb, 0% to 0.5% of Sn, 0.02% to 0.10% of Mg, 01% to 0.5% of RE (Ce, La), Fe as balance, and unavoidable impurity.

Abstract: A highly stiff and highly damping cast iron containing C and Si in an amount of 3.30 to 3.95% in terms of carbon equivalent shown in the following equation (1), Mn: 0.25 to 1.0%, P: 0.04% or less, S: 0.03% or less, Al: 3 to 7%, and Sn: 0.03 to 0.20%, balance being Fe and unavoidable impurities: Carbon equivalent (%)=C(%)+(1/3)×Si(%)??(1).

Abstract: A high rigidity, high damping capacity cast iron, which is a cast iron containing 3 to 7% of Al, and produced by heating at 280 to 630° C. after casting, and then cooling.

Abstract: A Ni alloy layer is formed on a surface of a steel base on the side to be in direct contact with a molten aluminum alloy, and titanium carbide (TiC) is bonded in a particulate state to the surface of the Ni alloy layer. This makes it possible to provide a metal material having materially enhanced melting loss resistance without resorting to conventional techniques, such as the provision of a ceramic coating by PVD or CVD.

Abstract: A high rigidity, high damping capacity cast iron, which is a cast iron containing 3 to 7% of Al, and produced by heating at 280 to 630° C. after casting, and then cooling.

Abstract: A Ni alloy layer is formed on a surface of a steel base on the side to be in direct contact with a molten aluminum alloy, and titanium carbide (TiC) is bonded in a particulate state to the surface of the Ni alloy layer. This makes it possible to provide a metal material having materially enhanced melting loss resistance without resorting to conventional techniques, such as the provision of a ceramic coating by PVD or CVD.

Abstract: A Ni alloy layer is formed on a surface of a steel base on the side to be in direct contact with a molten aluminum alloy, and titanium carbide (TiC) is bonded in a particulate state to the surface of the Ni alloy layer. This makes it possible to provide a metal material having materially enhanced melting loss resistance without resorting to conventional techniques, such as the provision of a ceramic coating by PVD or CVD.

Abstract: A highly stiff and highly damping cast iron containing C and Si in an amount of 3.30 to 3.95% in terms of carbon equivalent shown in the following equation (1), Mn: 0.25 to 1.0%, P: 0.04% or less, S: 0.03% or less, Al: 3 to 7%, and Sn: 0.03 to 0.

Abstract: A Ni alloy layer is formed on a surface of a steel base on the side to be in direct contact with a molten aluminum alloy, and titanium carbide (TiC) is bonded in a particulate state to the surface of the Ni alloy layer. This makes it possible to provide a metal material having materially enhanced melting loss resistance without resorting to conventional techniques, such as the provision of a ceramic coating by PVD or CVD.