低合金铸铁在海水中的腐蚀行为与普通铸铁相似。
Corrosion behavior of low alloy cast irons in seawater is similar to that of ordinary cast irons.
同时，由于采用普通铸铁作为模具主体材料，降低了成本。
Meanwhile, common cast iron was used as the main material of the die so that the manufacture cost was lowered.
普通铸铁在天然海水及流动海水中的腐蚀速度与碳钢接近。
Corrosion rate of ordinary cast irons is close to that of carbon steel in natural and flowing seawater.
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