Surface Treatment & Coating Services - HDG, Powder Coat & Blasting
Coating failure is the most expensive kind of rework in steel fabrication, because it fails years later, on site, in the weather. And it almost never fails because the paint was cheap - it fails because the surface was not prepared, the profile was wrong, or the coating spec was never tied to the environment the part actually lives in. In Australia, where outdoor steel meets salt, UV and coastal humidity, that specification gap is what sends buyers back to certified suppliers.
We finish steel per environment, not per habit: hot-dip galvanizing to AS/NZS 4680 for outdoor structural work, powder coating for equipment and enclosures, and abrasive blasting to SA 2.5 before any paint system goes on. Twenty years of export experience to Australia means the coating standard you need is the one we already work to.
Coating Capabilities
| Item | Specification |
|---|---|
| Hot-dip galvanizing | To AS/NZS 4680, batch processed |
| Powder coating | RAL colors, typical 60 – 120 μm |
| Abrasive blasting | SA 2.5 surface preparation |
| Paint systems | Primer + top coat, matched to environment (C3–C5 per ISO 12944) |
| Verification | Coating thickness measurement, adhesion testing on request |
Planning for Coating Starts at the Drawing Stage
A part that will be galvanized needs drainage holes, venting, and thread protection designed in before cutting - not drilled on site after failure. We review your drawing for coating readiness before production: holes for drainage and venting, weld quality suitable for zinc pickup, and edges smooth enough to hold a uniform coating. This drawing-stage review is why our HDG parts arrive at install with the coating intact and the holes where they belong.
Which Coating for Which Job?
Outdoor structural & fencing: hot-dip galvanizing to AS/NZS 4680 - the standard Australian specifiers ask for by name.
Equipment & enclosures: powder coating in RAL colors, with a matching corrosion class for the install environment.
Coastal & marine: blasted to SA 2.5, then zinc-rich primer plus top coat per the project's C5-class requirement.
Machined faces: masked before coating, or re-machined after - precision surfaces stay clean.
Why Buyers Choose Us for Coating
Australian specifiers name AS/NZS 4680 because they have seen uncoated corrosion claims. Twenty years of export experience to Australia means we already work to that standard - and the drawing-stage coating review that keeps outdoor steel from failing in year three.
Quality Control on Coated Parts
Coating thickness verified against the standard, adhesion checked on representative parts, and machined or threaded surfaces confirmed clean before packing. Every galvanized batch is traceable to its processing record, and certificates are supplied on request.
How an Order Moves Through Our Shop
Send the drawing and the install environment → we confirm the coating system and corrosion class within 24 hours → coating-readiness review of the design (drainage, venting, threads) → blasting to SA 2.5 → coating applied to spec → thickness and adhesion verified → traceable batch records shipped with the parts. The environment drives the spec, and the spec drives the process - never the other way around.
Related Fabrication Services
Laser cutting - cut edges ready for coating
Robotic welding - weld quality suited to HDG pickup
Post-weld machining - machined faces masked before coating
Coating FAQ
Q: Do you galvanize to AS/NZS 4680?
A: Yes - hot-dip galvanizing to AS/NZS 4680 is a core certified capability and the default finish for our outdoor structural work.
Q: Do you coat parts that other shops fabricated?
A: Yes, we accept fabricated parts for blasting and coating - but we strongly prefer to review the design before fabrication for drainage and venting.
Q: Can you powder coat in specific RAL colors?
A: Yes, standard RAL range with 60–120μm typical film thickness.
Q: How do you protect threads and machined faces during galvanizing?
A: Masking, plugging, or post-coating re-machining per part - planned before the batch runs.
Q: What is the added lead time for coating?
A: HDG adds 3–7 days to a fabrication order; powder coating adds 2–4 days.
Not sure which finish your project needs? Send your drawing and install environment - we'll specify the coating, the preparation and the verification within 24 hours.