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Galvanizing Ductile Iron Castings

A new customer of mine wants their ductile iron castings galvanized. The parts are the tongue and clevis dead ends you see on guy wires that support telephone poles. Basically, they are big eye bolts made from 60-40-18 ductile iron. My local galvanizer has done galvanizing of steel castings for me with OK success. He is telling me that because the parts are ductile iron that he is going to have to galvanize at 580 degrees C (versus 450-460 degrees C for steel parts). Is this correct? If so, why? Is the temperature for steel castings correct?

Also, obviously this part is going to be outside 24/7 and the parts have to be completely coated and uniform in thinkness. Because of these requirements do you need a rack to hold the parts individually to ensure complete coating and uniform thinkness?

Thanks in advance.

Chris Duklet
- Milwaukee, WI

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