我厂管件生产的退火工艺时间长,能耗大,质量不稳,且效率低。经多次生产性试验证明:铁素体可锻铸铁的快速退火的关键问题,在于对高温温度、高温时间、低温时间及含硅量的控制,获得了济玛铁素体可锻铸铁快速退火工艺。该工艺与旧退火工艺、锌气氛退火工艺、国内外先进退火工艺的比较见表1。由比较可以得出以下结论,锌气氛退 I plant pipe production annealing process for a long time, energy consumption, unstable quality, and low efficiency. After several productive experiments, it is proved that the key problem of rapid annealing of ferrite malleable iron lies in the rapid annealing process of austenite ferrite malleable iron with the control of high temperature, high temperature time, low temperature time and silicon content. The process and the old annealing process, zinc annealing atmosphere, advanced annealing process at home and abroad in Table 1. By comparison, we can draw the following conclusions, zinc atmosphere retreat