Description
ASTM A123 Hot-Dip Galvanized
ASTM A123 is the Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products. It covers the requirements for the galvanizing process, including minimum coating thickness, coating weight, finish quality, and adherence to the base steel.
This specification is widely applied to steel shapes, plates, bars, and assembled fabrications intended for corrosion resistance through hot-dip galvanizing.
Key Highlights of ASTM A123:
- Covers structural steel products including rolled, pressed, and forged shapes.
- Includes guidelines for single and multiple dip galvanizing processes.
- Ensures uniform zinc coating for optimal corrosion protection.
- Specifies inspection, test methods, and coating quality standards.
ASTM A123 Specification
| Property | Description |
|---|---|
| Scope | Hot-dip zinc coating on iron and steel products |
| Coating Type | Zinc (by hot-dip process) |
| Materials Covered | Structural steel, iron castings, bars, plates, pipes, and fabricated assemblies |
| Coating Thickness | Based on steel thickness (ranging from 45 µm to over 100 µm) |
| Test Methods | Coating thickness (magnetic or weight method), visual inspection |
| Finish | Smooth, free from blisters, flux deposits, and uncoated areas |
| Adherence | Coating must withstand handling and fabrication stresses |
Coating Thickness Requirements (Average)
| Material Category | Steel Thickness (mm) | Minimum Average Coating Thickness (µm) |
|---|---|---|
| Plate, Strip, Bar | ≥ 6.0 | 85 |
| Structural Shapes | ≥ 6.0 | 85 |
| Pipe and Tubing | ≥ 5.0 | 75 |
| Wire Products | Varies | 50 to 100 |
Equivalent Standards to ASTM A123
| Standard | Region/Organization | Description |
|---|---|---|
| ISO 1461 | International | Hot-dip galvanized coatings on fabricated iron and steel articles |
| EN ISO 1461 | Europe | European version of ISO 1461 |
| CSA G164 | Canada | Hot dip galvanizing of irregularly shaped articles |
| AS/NZS 4680 | Australia/New Zealand | Hot-dip galvanized (zinc) coatings on fabricated ferrous articles |
| JIS H 8641 | Japan | Hot-dip zinc coatings on steel products |
Applications
- Construction Industry
- Utility & Infrastructure
- Industrial Plants
- Transportation
- Agriculture & Marine
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