为降低铸铁热处理生产成本,我厂采用了集中工艺要求相近的铸件,满负荷装炉的办法进行热处理。即将要求以铁素体为基的与要求以珠光体为基的铸件同炉处理,首先都处理成铁素体可锻铸铁,然后将要求以珠光体为基的铸件再重新加热到临界度Ac上限,使奥氏体均匀化出炉空冷,以获得珠光体可锻铸铁。为此我们把第一、二阶段分开,即第一阶段石墨化后空冷又经消除应力回火,就达到了以珠光体为 In order to reduce the production cost of cast iron heat treatment, our factory adopts the casting process that requires similar process requirements and heat treatment at full load. Coming soon to be ferritic-based and co-processing with pearlite-based castings, ferritic malleable cast iron is first processed and then the pearlite-based castings are reheated to the critical Ac limit, The homogenization of the austenite furnace air cooling to obtain pearlite malleable iron. To this end, we separate the first and second phases, that is, after the first stage of graphitization air cooling and stress tempering, to achieve the pearlite is