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可锻铸铁退火周期长,燃料消耗大,退火质量不稳定是当前生产中急待解决的问题。近两年,石家庄市机械研究所、河北机电学院、河北工学院等单位组成锌气氛退火试验研究小组,并先后在石家庄市农机厂,河北三七四厂进行生产试验,将铁素体可锻铸铁退火的高温石墨化时间缩短到1～3小时,低温石墨化时间缩短到5～7小时,总退火周期:0.5吨燃煤室状炉为13～15小时,2吨燃煤室状炉为17～20小时;10～15吨燃煤室状炉为
Long malleable cast iron annealing cycle, fuel consumption, unstable annealing quality is an urgent problem in the current production. In the recent two years, Shijiazhuang Institute of Machinery, Hebei Institute of Mechanical and Electrical Engineering, Hebei Institute of Technology and other units composed of zinc atmosphere annealing test research group, and successively in Shijiazhuang City Agricultural Machinery Factory, Hebei 374 Factory production test, the ferrite malleable iron is annealed Of the high-temperature graphitization time is shortened to 1 to 3 hours, low temperature graphitization time is shortened to 5 to 7 hours, the total annealing period: 0.5 tons of coal-fired chamber furnace for 13 to 15 hours, 2 tons of coal- 20 hours; 10 ~ 15 tons of coal-fired chamber furnace