由于自口铸铁的硬度很高,常将之用于磨料磨损的工况下。最早用于生产的是不含或只含少量合金元素的普通白口铸铁。其金相组织中没有石墨,而是由珠光体和M_3C(渗碳体)型碳化物所组成。由于不含合金的珠光体的显微硬度只有H_v250-320,而含合金的珠光体为H_v300-460;不含合金的渗碳体的显微硬度为 Since the hardness of self-cast iron is high, it is often used in abrasive wear conditions. The earliest used for the production of ordinary white cast iron containing no or only a small amount of alloying elements. There is no graphite in its microstructure, but by pearlite and M_3C (cementite) type carbide. Since the microhardness of the pearlite without alloy is only H_v250-320, and the pearlite with the alloy is H_v300-460; the microhardness of the cementite without the alloy is