一、前言 YN30A型内燃凿岩机是一种以汽油为动力的凿岩机具。由于它的工作环境较恶劣,这就要求主要磨损件气缸体除具有良好的导热性、耐热疲劳性能及较高的机械性能(相当于HT30-54)外,还要具有良好的耐磨性和较好的机加工性能。八十年代初我厂生产的气缸体一直用铜铬钼铸铁,它基本上满足了使用要求,但耐磨性差。硼铸铁是一种较新型的耐磨铸铁,但传统的硼铸铁机械性能偏低(相当于 I. Introduction YN30A internal combustion rock drill is a gasoline-powered rock drilling equipment. Due to its harsh working environment, this requires that the main wear parts cylinder block have good heat resistance, thermal fatigue resistance and high mechanical properties (equivalent to HT30-54), but also have good wear resistance And better machinability. At the beginning of 1980s, the cylinder block produced by our factory always used copper, chrome and molybdenum cast iron, which basically met the requirements of use, but its wear resistance was poor. Boron cast iron is a relatively new type of wear-resistant cast iron, but the traditional boron cast iron mechanical properties are low (equivalent to