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Coating Performance difference of Galvanneal Vs Galvanized

I would like to know the difference between galvanized and galvanneal, Also what is G60 or G90 metal?

John W Thornton
- Kingston, Ontario, Canada
2003

G60 and G90 are designations for the thickness of the zinc coating when electrogalvanized.

Ronald Zeeman
- Brampton, Ontario, Canada
2003

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G60 and G90 are zinc coating weight designations measured in ounces per square foot. They can generally range from G30 up to G400.

Galvannealed sheet is carbon steel coated with zinc on both sides by the continuous hot dip process. Immediately as the strip exists the coating bath, the zinc coating is subjected to an in-line heat treatment that converts the entire coating to a zinc iron alloy. Conversion to the alloy results in a non-spangled matte finish which makes the sheet suitable for painting. The coating is harder than a regular galvanized coating and is more resistant to scratching and manufacturing damage.

Mike Stroia
- Canton, Ohio
2003

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October 26, 2009

Thanks Ronald. Thanks Mike. To put it just a little more exactly, G60 and G90 are expressed in hundredths of an ounce per square foot, e.g., G60 is a total of 0.60 ounces per square foot for both sides of the sheet put together.

Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey

Q. Hello all,

What could be the difference between G60 & G90 in physical appearance? Just curious, how to identify the material physically.

Thanks.

Minni Jain
- Brampton, Ontario, Canada
June 7, 2012

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