一、概要目前厂内生产的气缸套,其材料为铬镍铝合金铸铁,采用工频炉熔炼(炉料中配有新生铁)和砂型铸造。其材质存在二个问题,一为金相组织中复合磷共晶量超过4％,其二为硬度超出HB207—241范围。现将47炉次气缸套的检验情况分析归纳后提出控制成品成分:碳当量3.30～3.52％碳加1/3硅3.44～3.66％,铬加锰1.35～1.5％,成分碳2.90～3.15％、硅1.45～1.65％、锰0.90～1.15％、铬0.30～0.45％、钼0.35 I. Overview At present, the cylinder liner produced in the factory is made of CrNi alloy cast iron and is made of power-frequency furnace melting (with fresh iron in charge) and sand casting. The material there are two problems, one for the microstructure of composite phosphorus eutectic amount of more than 4%, the second is hardness beyond the scope of HB207-241. Presently, after analyzing the inspection conditions of 47 heat-cylinder liners, it is proposed to control the finished product components: carbon equivalent 3.30-3.52% carbon plus 1/3 of silicon 3.44-3.66%, chromium plus manganese 1.35-1.5% and component carbon 2.90-3.15% 1.45 to 1.65% of silicon, 0.90 to 1.15% of manganese, 0.30 to 0.45% of chromium, and 0.35 of molybdenum