阀门铸钢件的裂纹缺陷分析及工艺控制  

Analysis on Crack Defects and Process Control of Valve Steel Casting

作　　者：陈淑惠[1] 

机构地区：[1]陕西工业职业技术学院,陕西咸阳712000

出　　处：《铸造技术》2008年第7期860-863,共4页Foundry Technology

摘　　要：分析了阀门铸钢件经常出现的裂纹缺陷的形成原因,从生产角度提出了防止和消除裂纹的工艺措施。主要强调以下几点:提高型芯的退让性,以减小收缩应力,将芯子做成中空结构效果明显;严格控制化学成分,特别是硫、磷等易形成低熔点共晶物的元素;细化晶粒,净化钢液,以提高抗裂性,加入稀土元素可以兼得;采用冷铁,适当提高浇注速度,在保证良好补缩的前提下减弱顺序凝固,使铸件局部实现同时凝固,减小热应力。The reason that causes cracks of valve castings was analyzed, the measures to prevent and eliminate cracks was proposed. The following points were emphasized： the hollow structure of core can improve yieldability and reduce the shrinkage stress; the chemical composition should be controlled strictly, particular sulfur, phosphorus which can easily form low-melting eutectic; Adding RE can refine grains, purify liquid steel and enhance crack resistance; Using iron chill, increasing pouring temperature and weakening progressive solidification under the premise of ensuring good feeding, can realize casting regional simultaneous solidification, thus reduce the thermal stress.

关 键 词：阀门铸钢件 裂纹缺陷 工艺控制 

分 类 号：TG260[金属学及工艺—铸造]