A cast iron having a high vibration damping capacity and its manufacturing method

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PROBLEM TO BE SOLVED : To obtain cast iron containing fine graphite and having high damping capacity without using a die nor adding Ti. SOLUTION : The cast iron having high vibration damping capacity has a composition containing, by weight, 2.8 to 3.8% C, 1.0 to 2.7% Si, 0.3 to 2.0% Mn, =-Si%/2+4, 0.5% Mn and 0.004 to 0.020% rare earth elements, and the balance substantially Fe.