韧性铸铁建造，保证最大的力量可能接触酸洗的纸浆和纸张应用瘫痪和耐力。
Constructed of ductile cast iron, it ensures maximum strength and endurance for possible exposure to acid wash down in pulp and paper applications.
但需要注意一点就是硬度跟上了，其韧性也要跟上，这样才能算是好的铸铁井盖。
But need to note is a hardness up, its toughness is to catch up, this can be a good iron manhole cover.
利用锻造方法并结合锻后适当的热处理工艺可大幅度提高铬合金白口铸铁的冲击韧性。
Adopting forging method and proper heat treatment after forging can improve significantly the impact toughness of chromium alloy white cast iron.
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