大家知道,白口铁的退火是比较困难的。退火一炉白口铸件,就得消耗60～95个小时,有时因操作不良,质量达不到要求。我们在以白口铁代替灰口铁的口号下,进行了大胆的试验工作,经多次试验,取得了一定的效果。白口铁在退火前的金相组织是片状珠光体、次生碳化物、莱氏体(如图1), We all know that the white iron annealing is more difficult. Annealing a furnace white castings, you have to consume 60 to 95 hours, sometimes due to poor operation, quality does not meet the requirements. Under the slogan of “white iron” instead of “gray iron”, we conducted a bold experiment. After several tests, we achieved some results. White iron in the microstructure before annealing is flaky pearlite, secondary carbides, ledeburite (Figure 1),