球墨铸铁管断后伸长率不合格原因分析  

Analysis on Unqualified Elongation of Nodular Cast Iron Pipe after Fracture

作　　者：张久峰[1] 黄飞[1] 汝阳 

机构地区：[1]国家钢铁及制品质量监督检验中心,安徽马鞍山243000

出　　处：《铸造技术》2014年第5期990-991,共2页Foundry Technology

摘　　要：采用金相检验及断口分析等方法对DN400输水用球墨铸铁管断后伸长率偏低的原因进行了分析。结果表明,DN400输水用球墨铸铁管断后伸长率不合格的原因是球墨铸铁球化不良及石墨漂移所致。The reasons for low elongation of DN400 water delivery nodular cast iron pipe after fracture were analyzed by the methods of metallographic examination and fracture analysis. The results show that the reasons for unqualified elongation of DN400 water delivery nodular cast iron pipe after fracture are abnormal nodularizing and graphite floatation.

关 键 词：球墨铸铁 断后伸长率 球化不良 石墨漂浮 

分 类 号：TG255[金属学及工艺—铸造]