DN800mm球墨铸铁管的生产

Production of DN800 Ductile Cast Iron Pipe

DN8 0 0 mm管退火后存在延伸率低、合格率低的问题 ,经分析 ,退火炉轨道变形、铸态管本身椭圆及加热时间不够等是导致管子变形的主要原因。为此 ,调整铁水化学成分和浇注工艺参数 ,对退火炉炉底及轨道进行改造 ,并采用“高温快速”的退火工艺 ,从而提高了管子的圆整度和生产效率 ,退火合格率达到了 10 0 %。

There exit the problems of the lower percentage elongation,lower qualification rate of annealed DN800mm pipes. The tracks deformation of annealing furnace, body ellipse of casting pipes and insufficient heating time are the main factors resulting in deformation of pipes.The ovality of pipes and production efficiency can be improved and the annealing qualification rate have reached 100% after adjusting the chemical composition of iron and casting parameters, and reconstructing of furnaces bottom and its tracks, and using the annealing process of 'high temperature and short annealing'.