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Galvanizing

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I would like to know if anyone has information on the smoothness of a
galvanized coating being affected by Silicon in the steel.  I received a
handrail from the galvanizer with an orange peel surface and was told that
it was a result of high silicon content.  If silicon is the culprit, at what
% level does the coating have problems?   Any other comments or experience?

Dee Henrie PE
Adams & Smith Inc.