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Galvanized sheet metal g60 g90.
Galvanized steel is the result of applying a protective zinc coating to steel to prevent it from rusting.
G60 0 60 183 g90 0 90 275 g115 1 15 351 g140 1 40 427 g165 1 65 504 g185 1 85 565 g210 2 10 641.
The a coatings have a dull gray color with no spangle while the g coatings are bright shiny and can have various sized spangle visible.
Galvannealed steel results from the dual process of galvanizing and annealing the steel.
Deep drawing steel and extra deep drawing steel are designations described in the astm specifications for steel sheet zinc coated galvanized or zinc iron alloy coated galvannealed by.
Hot dip galvanizing is the process of coating iron or steel with a thin zinc layer by passing the steel through a molten bath of zinc at a temperature of around 860 f 460 c.
If it is for outdoor use or in a high moisture environment i would always specify g90 just because it seems to make a difference over time.
This makes it rust proof and easy to paint.
I hope this helps.
First of all g90 is not a galvanizing specification.
The g60 is the most common galvanized metal and determines the amount of galvanize on the metal.
Hot dip galvanized steel.
The g90 would be more galvanized coating than say g60.
It is a coating thickness designation in the galvanizing specification astm a653.
When exposed to the atmosphere pure zinc reacts with oxygen to form zinc oxide which further reacts with carbon dioxide to form zinc carbonate a dull grey fairly strong material that stops further.