高铬铸铁是一种新型抗磨材料,在破碎、研磨、物料输送等机械上已得到广泛应用。由于高铬铸铁的硬度很高,铸态达HRC48～55,淬火态达HRC60～67,所以切削加工非常困难。我们采用了以下软化退火工艺:为使铸件得到珠光体组织正常退火,应先把铸件随炉加热到980℃,并保温2～3h(从室温加热到退火温度的升温 High-chromium cast iron is a new type of anti-wear material, which has been widely used in crushing, grinding, material handling and other machinery. Due to the high hardness of high-chromium cast iron, as-cast up to HRC48 ~ 55, quenched state HRC60 ~ 67, so cutting is very difficult. We have adopted the following softening and annealing process: In order to make the casting get pearlite normal annealing, the casting should be first with the furnace heated to 980 ℃, and incubated 2 ~ 3h (from room temperature to the annealing temperature of the heating