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在改进球铁的物理和机械性能方面美国仍保持高的水平。以下是美国铸造厂球铁生产的调查结果。1966至1974年间,是美国球铁生产突飞猛进的时期,从78．5万吨增加到320万吨以上,增加了三倍多。以后,随着美国铸造生产总的趋势下降了。表1描绘出了这一高峰增涨和1975至1982年间球铁生产情况。近年,美国球铁生产虽有下降趋势,但对球铁的兴趣仍是高的,因为球铁有为铸件生产者开辟新市场的潜力:取代铸钢件和某些锻件。为此,球铁生产者要继续改善其铸件的物理和机械性能。改善性能的关键是铸造厂(车间)的球铁生产操作工艺。为了明确铸造厂使用什么样的生产工艺及其效果、《现代铸造》组织了一次对美国球铁生产者的调查,下面是这一调查结果的总结。
The United States still maintains a high standard in improving the physical and mechanical properties of ductile iron. The following is the United States foundry ductile iron production survey results. From 1966 to 1974, it was a period of rapid growth in the production of ductile iron in the United States, more than tripling from 785,000 tons to over 3.2 million tons. Later, as the United States casting the general trend of decline. Table 1 depicts this peak increase and the ductile iron production between 1975 and 1982. In recent years, although the ductile iron production in the United States has been declining, interest in ductile iron is still high. Ductile iron has the potential to open up new markets for casting producers: replacing cast steel and some forgings. As a result, ductile iron producers continue to improve the physical and mechanical properties of their castings. The key to improving performance is the ductile iron production operation of the foundry (workshop). In order to clarify what kind of production process and its effect the foundry used, “Modern Casting” organized a survey of US ductile iron producers. The following is a summary of the findings.