ductile iron manhole cover

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ductile iron manhole cover
Posting date : Feb 28, 2011
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72-
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Ductile iron, high strength, toughness, and therefore graphite covers more than type of grey cast iron manhole cover light 30%. Ductile iron grade adopts QT500-7, no less than iron melt temperature, ball in 1456 degrees with rare earth magnesium ...

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