Meanwhile, common cast iron was used as the main material of the die so that the manufacture cost was lowered.

同时，由于采用普通铸铁作为模具主体材料，降低了成本。

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Because the environmental differences between the north and the south, the south than the common cast iron covers north low weight, but do not think that the more the better.

因为南北环境的差异，南方的铸铁井盖普遍要比北方的重量偏低，但千万不要认为越重越好。

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The hardness and its microhardness of medium phosphorus white cast iron are higher than those of the common white cast iron, but its impact toughness slightly decreases.

中磷白口铸铁的宏观硬度和显微硬度高于普通白口铸铁，但冲击韧性略有降低。

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