1 前言 自球墨铸铁问世以来,它的许多优异性能在长期生产实践中被证实,因而在机械制造业中的用途日趋广泛。近十年来,世界年产量成倍增长,国内外都把它作为一项颇有发展前途的工程材料进行研究。我公司应用球墨铸铁已有30余年的历史,用以制造柴油机曲轴、凸轮轴、传动齿轮等重要零件,获得显著的经济效果。随着生产技术的发展, 1 Introduction Since the advent of nodular cast iron, many of its outstanding properties have been proven in long-term production practices and are therefore becoming more widely used in the machinery industry. Over the past decade, the world’s annual output has doubled and both China and abroad have studied it as a promising engineering material. Our company has applied ductile iron for more than 30 years to manufacture significant parts such as crankshafts, camshafts and transmission gears of diesel engines and obtain remarkable economic results. With the development of production technology,