众所周知,金属型离心铸造球墨铸铁管的工艺是一项应用较广、生产效率较高的方法。为了保证获得纯铁素体基体组织的铁管,必须对铸件进行高温退火和低温退火热处理,只有这样,铁管材料的机械性能才能满足QT42—10的要求。而球铁管的退火时间、尤其是高温退火时间又密切地与铁管的质量以及生产过程有夫。因为过长的高温退火时间不只会引起铁管的变形(长度弯曲、断 As we all know, metal centrifugal casting ductile iron pipe technology is a wider application, higher productivity. In order to obtain the pure iron ferrite matrix of iron pipe, the casting must be high-temperature annealing and low-temperature annealing heat treatment, the only way the mechanical properties of iron pipe material to meet the requirements of QT42-10. The ductile iron annealing time, especially the high temperature annealing time and the quality of the iron pipe and the husband of the production process. Because of the long high temperature annealing time will not only lead to deformation of the iron pipe (bending length, broken