Re: I am looking for a way to detect low carbon galvanized steel

I will make an assumption that you are trying to detect the presence of
galvanized plating on cold rolled steel during the rolling process ("on the
run").
One consideration is a resistivity test. Zinc used in the galvanizing 
process
is approximately half the resistivity value of carbon steel. However, the
quality of any detection method is directly related to the surface 
cleanliness
of the steel. You may want to try  steel wool wipers used as a cleaning 
agent.

Another method is exposing the steel to the outside environment until the 
cold
rolled steel starts to oxidize. The galvanized sections will not.

I hope the may give you some ideas.


Reference: http://www.ai.mit.edu "Electrical Resistivity of Materials"