Ductile iron has yield strength of 40k and cast iron has none.

球墨铸铁的屈服强度是40K，而铸铁没有屈服强度。

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Ductile iron has yield strength of 40k and cast iron has none.

球墨铸铁的屈服强度是40K，而铸铁没有屈服强度。

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