Development of automotive high-strength materials without using rare earth

用含0.01%La和0.025%Ca的球化剂处理后，石墨球数为916个/mm~2，远高于市售球化剂(RE0.045%)处理后的836个/mm~2。30 mm直径球化剂的抗拉强度为460 Mpa，延伸率为25%。与市售含La和Ca球化剂的稀土含量相比，稀土含量可降低约1/4。

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.