铸态QT550-7球铁生产工艺与加工性能研究  

Research on Production Process and Processing Performance of As-cast QT550-7 Ductile Iron

作　　者：夏翔 XIA Xiang(School of Mechanical and Electrical Engineering,Jinggangshan University,Ji’an 343009,Jiangxi,China)

机构地区：[1]井冈山大学机电工程学院,江西吉安343009

出　　处：《热处理技术与装备》2024年第6期31-34,共4页Heat Treatment Technology and Equipment

摘　　要：采用冲天炉-电炉双联熔炼方法,研究铜、锰添加量对QT550-7球铁的影响。QT550-7铸态球铁的化学成分为(ω%):3.7~3.8C,2.4~2.6Si,≤0.03P,≤0.02S,0.5~0.6Mn,0.25~0.35Cu。Cu、Mn配比对QT550-7球铁的性能有显著的影响。当Mn高、Cu低时,球铁塑性较差,硬度较高,且随着管壁厚度减薄和冷却速度加快,Mn提升硬度的趋势增大,可用于汽车底盘、轮毂类铸态球墨铸铁件的生产,并可使成本降低。Cu高、Mn低的配比,其硬度较低,塑性更好,生产稳定性高。The influence of the additional amount of Cu and Mn on QT550-7 ductile iron was investigated with the condition of cupola-electric furnace duplexing smelting.The chemical composition of the as-cast QT550-7 ductile iron is(ω%):3.7-3.8C,2.4-2.6Si,≤0.03P,≤0.02S,0.5-0.6Mn,0.25-0.35Cu.The match of Cu and Mn has a significant influence on the properties of QT550-7 ductile iron.With the proportion of high content of Mn and low content of Cu,the ductile iron has low plasticity and high hardness.With the wall thickness reducing and the cooling speed fasting,the trend of hardness increase is growing with the content of Mn increasing.So it can be used to produce automobile chassis and hubs cast ductile iron parts with lower cost.With the proportion of high content of Cu and low content of Mn,the ductile iron has low hardness and high plasticity,and the process is more stable.

关 键 词：铸态球铁 QT550-7 生产工艺 加工性能 

分 类 号：TG143.5[一般工业技术—材料科学与工程]