Development of automotive high-strength materials without using rare earth

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In the sample treated with a spheroidizer containing 0.01% La and 0.025% Ca, the graphite nodule count became 916 number/mm2,which is much higher than the graphite nodule count, 836 number/mm2, of the sample treated with the commercial spheroidizer(RE0.045%).Good mechanical properties, the tensile strength of 460MPa and elongation of 25%, were obtained in 30mm daiameter specimen.By the amount of RE was able to be reduced to about 1/4 compared with the RE content of a commercial spheroidizer using the spheroidizer with La and Ca.