black heart malleable iron(① The form of graphite in blackheart malleable iron consists of nodules of a fuzzier type than those of S.G. iron. 黑心可锻铸铁中的石墨形状呈球形，但比起球墨铸铁中的球状石墨有些模糊。② Pearlitic malleable iron is harder and stronger than the blackheart malleable iron； consequently most of its present uses are for parts which were originally produced in steel. 珠光体可锻铸铁与黑心可锻铸铁相比，硬度更高、强度更大。因此现在使用它制造的大部分零件，在过去都是用钢制造的。)
