1. ASTM hot-dip galvanizing adhesion requirements
| Steel thickness (mm) | Product type g/m2 (μm) | |||
| Structural steel | Steel plates and bars | Steel Pipe | Steel bars and wires | |
|
＜1.6 |
320(45) |
320(45) |
320(45) |
245(35) |
|
1.6～3.2 |
460(65) |
460(65) |
320(45) |
355(50) |
|
3.2～4.8 |
530(75) |
530(75) |
530(75) |
425(60) |
|
4.8～6.4 |
600(80) |
600(80) |
530(75) |
460(65) |
|
＞6.4 |
705(100) |
705(100) |
530(75) |
565(80) |
2. ASTM A123 steel types and coating thickness grades
| Material type (In/mm) |
＜1/16(1.6) |
＜1/16～1/8(3.2) |
1/8～3/16(4.8) |
＜3/16～1/4(6.4) |
＞1/4(6.4) |
| Structural member |
45 |
65 |
75 |
85 |
100 |
| Steel plate |
45 |
65 |
75 |
85 |
100 |
| Steel Pipe |
45 |
45 |
75 |
75 |
75 |
| Steel wire |
35 |
50 |
60 |
65 |
80 |
3. ASTM A123 steel layer thickness grade correspondence table
| Thickness grade |
Mils |
Oz/frt2 |
μm |
g/m2 |
|
35 |
1.4 |
0.8 |
35 |
245 |
|
45 |
1.8 |
1.0 |
45 |
320 |
|
50 |
2.0 |
1.2 |
50 |
355 |
|
55 |
2.2 |
1.3 |
55 |
390 |
|
60 |
2.4 |
1.4 |
60 |
425 |
|
65 |
2.6 |
1.5 |
65 |
460 |
|
75 |
3.0 |
1.7 |
75 |
530 |
|
80 |
3.1 |
1.9 |
80 |
565 |
|
85 |
3.3 |
2.0 |
85 |
600 |
|
100 |
3.9 |
2.3 |
100 |
705 |
4. ASTM D3359 knife cutting adhesion test
| Different substrates | Hot dipped galvanized sheet | Galvanized pattern plate | Cold rolled steel sheet | Corroded steel plate |
| WellZinc840 zinc powder paint |
4B |
4B |
4B |
4B |
Note: In the original specification, 5B means complete adhesion; 0B means most of the area is peeled off.
| Galvanized iron sheet |
| Hot dip galvanized steel |
