Alloy Trends of a Half Century The picture of alloy production has changed much in the last 50 years. As shown in the pie graphs below, gray iron (blue), while still the highest produced alloy (by tonnage) has decreased from over three-quarters of the pie to less than half. Meanwhile, ductile iron (orange) and aluminum (yellow) has grown considerably.
50
近50年有色铸件的发展趋势 有色铸件产量在过去的50年发生了很大变化。如饼 图所示，灰铸铁件（蓝色）虽仍是产量最多的铸件，但 其比例已从过去的3/4降低到不到一半。同时，球墨铸 铁件（桔色）和铝合金铸件（黄色）产量增长显著。
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