steel alloy hot dipped galvanized - coil slitting

coating    minimum coating weight (c)
triple-spot testing                   single-spot testing  
 
designation
 g/m oz/ft
 g/m oz/ft 
G 235
G 210
G 185
G 165
G 140
G 115
G 90
G 60
G 01
A 60
A 40
A 01  717
640
564
503
427
351
275
183
No minimum
183
122
No Minimum  2.35
2.10
1.85
1.65
1.40
1.15
0.90
0.060
No minimum
0.60
0.40
No minimum 610
549
488
427
366
305
244
152
No minimum
152
91
No minimum 2.00
1.80
1.60
1.40
1.20
1.00
0.80
0.50
No minimum
0.50
0.30
No minimum
 (a) From ASTM A525  (b) G, regular type coating; A, zinc-iron type of coating  (c) Total weight on
both sides of sheet per unit area of sheet 

Designations and Weights of Zinc Coating
On Hot Dip Galvanized Sheet (a)

Extra smooth is the result of skin passing coated galvanized sheet material to impart a higher degree of smoothness. It is usually supplied in a coating designation G-90 only and is used for exposed, critical surfaces that are to be painted. If fluting or stretcher strains are a hazard, extra smooth should be specified.

Minimized spangle is the result of treating regular galvanized sheet during the zinc solidification to restrict the normal spangle formation. Product usually has a dull appearance not characterized by a high degree of uniformity and dissimilarity from coil to coil is not unusual.

Regular spangle is coated on continuous lines to specific coating designations. During normal solidifications, regular spangles are the result of the unrestricted growth of zinc crystals.

This is a process in which a protective coating of zinc and iron-zinc alloys is applied to steel by dipping into a bath of molten zinc. Most sheet steel is done on a continuous galvanizing line.

hot dipped galvanized

This is a process in which a protective coating of zinc and iron-zinc alloys is applied to steel by dipping