When selecting a Hot-Dip Galvanizing (HDG) service, savvy contractors and engineers know that price isn’t the only factor. The most critical element is the Galvanizing Standard. This is the only guarantee that your steel will resist corrosion for its intended design life.
At Siam Steel Galvanizing (SSG), we strictly adhere to the ASTM A123 standard—the global benchmark for the galvanizing industry.
What is the ASTM A123 Standard?
ASTM A123 is the standard specification for zinc coatings on iron and steel products, established by the American Society for Testing and Materials. It defines the minimum coating thickness required based on the type and thickness of the steel being galvanized.
Minimum Coating Thickness Requirements
Coating thickness is not arbitrary; it must be proportional to the steel’s thickness, measured in Microns (µm) or Grams per Square Meter (g/m²). Here are key examples
– Steel Category & ThicknessMinimum Average Coating (µm)
– Structural Shapes/Plates (> 6.4 mm) 100 µm
– Structural Shapes/Plates (3.2 – 4.8 mm) 75 µm
– Steel Bars (> 16 mm) 80 µm
Pro Tip: Standards-compliant galvanizing protects steel tens of times better than traditional painting. The zinc layer acts as a Sacrificial Anode, meaning even if the surface is scratched, the underlying steel remains protected from rust.
Why is Strict Compliance Mandatory?
- Predictable Service Life: Zinc thickness directly correlates with the duration of rust protection.
- Global Project Acceptance: Government infrastructure, renewable energy, and large-scale industrial projects always mandate ASTM A123 in their Terms of Reference (TOR).
- Maximum ROI: Standardized galvanizing eliminates premature maintenance costs, ensuring long-term financial viability.
The SSG Quality Control Advantage
We don’t just “dip” steel; we engineer protection through a rigorous QC process
- Thickness Testing: Using calibrated Magnetic Gauges to verify every workpiece.
- Adhesion Testing: Ensuring the zinc-iron alloy layers are metallurgical bonded and will not peel.
- Surface Finish Inspection: Ensuring pieces are free from zinc dross, blisters, or uncoated spots.
If you are unsure whether galvanizing is suitable for your project, you can contact us for free consultation:
Phone : (+66) 02-705-8755
E-mail: ssgl@ssggalvanizing.com
Official Line: @ssggalvanizing (or click to add @LINE)
#SSG #SiamSteelGalvanizing
#HotDipGalvanizing #GalvanizedSteel #InternationalStandard #ZincCoating #GalvanizedSteelGrating
