Galvanizing "Grades"
Galvanizing "Grades"
(OP)
Does anyone have any information on galvanizing "grades"? Specifically, whats the difference between G-60 and G-40? And is there an A-60 or A-40? Which is the "better" galvanizing?
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RE: Galvanizing "Grades"
www.hdg.org.uk/specifying/standards.htm
RE: Galvanizing "Grades"
http://www.usx.com/corp/sheet/coated/hotapp.htm
A60 and A40 are ratings for galvannealed steel. This is a hot-dipped process where the steel is heated after coating with zinc, converting the zinc coating into a harder zinc-iron alloy coating, that is also smoother, more scratch-resistant, and more paintable than a galvanized finish.
Ordinary galvanized steel has only a thin layer of the zinc-iron alloy, at the interface of the steel and the zinc. The outer coating remains zinc.
I believe that the A60/A40 coating thicknesses are equivalent to the G60/G40 galvanized coating thicknesses.
RE: Galvanizing "Grades"
RE: Galvanizing "Grades"
RE: Galvanizing "Grades"
Also refer to ASTM A446.
Distinction of G designation versus A designation is in the chemical. G designation is a zinc alloy and A designation is for Zinc-iron alloy. I am not an expert on galvanization so I hope you can find what you are looking for in the ASTM Specs.