热模法离心铸造球铁管伸长率低的原因探析  

The Cause for Low Elongation of Ductile Iron Pipein Hot Mold by Centrifugal Casting

作　　者：陈光[1] 李小亚[2] 张忠诚[2] 钟莉 

机构地区：[1]西北工业大学 [2]河北科技大学

出　　处：《特种铸造及有色合金》1999年第3期36-37,共2页Special Casting & Nonferrous Alloys

基　　金：国家"九五"科技成果重点推广计划;河北省自然科学基金

摘　　要：针对热模法离心铸造球铁管普遍存在的伸长率低问题，从离心铸造的特点出发分析了残余镁的变化。与冷模法比较，较长的凝固过程，使铁水中残余镁的过度氧化是导致热模法离心铸造球铁管伸长率低的根本原因。提高其伸长率的途径是防止氧化和缩短凝固时间。Low elongation is a general existing problem in hot mold by centrifugal casting for ductile iron pipe. The change of residnal Mg in molten iron was analyzed based on the feature of centrifugal casting. It is found that this disadvantage is attributed to the superoxidation of iron melt and the loss of Mg due to the centrifugal effect and the comparatively long holding time of the molten iron in the hot mold. One way to increase the elongation is to properly prevent Mg from oxidation, and the other is to shorten the solidification time.

关 键 词：离心铸造 球墨铸铁 伸长率 热模法 

分 类 号：TG249.4[金属学及工艺—铸造] TG255