Nevatronix Laser cuts galvanized steel — carbon steel with a hot-dip or electroplated zinc coating — on the same 3 kW fiber cell that runs mild steel. The appeal of galvanized is simple: the corrosion protection is already on the metal before it is cut, so a part can go straight into service without a paint line. The two things the zinc adds — fume during the cut and a bare-steel edge after it — are both routine to handle, and worth understanding before you spec it.
Specifications
| Attribute | Value |
|---|---|
| Coating | ASTM A653 hot-dip (G60 / G90), galvannealed, or electrogalvanized |
| Thickness range | 0.5 – 12 mm (carbon-steel envelope) |
| Cut tolerance | ±0.05 mm (±0.002 in) |
| Edge quality | ISO 9013 range 2 |
| Max sheet size | 1500 × 3000 mm (60 × 120 in) |
| Assist gas | Nitrogen or air |
| Edge condition | Faces coated; kerf edge bare |
Most galvanized sheet is specified in lighter gauges — roughly 0.5 to 3 mm — but because the substrate is carbon steel, the cutting envelope is the same as mild steel and extends to 12 mm.
How galvanized behaves under a fiber laser
Galvanized is mild steel underneath, so the base cut is the same — but the zinc coating changes two things. First, zinc vaporizes at around 907 °C, below the melting point of the steel it sits on. That means cutting galvanized releases zinc-oxide fume, which our cells capture with standard fume extraction. It is a controlled, everyday process, not a special case; the ventilation is simply part of running the material.
Second, the heat of the cut burns the zinc away right at the kerf, leaving a thin band of bare steel along every cut edge. The coating stays intact across the faces of the part, and zinc’s sacrificial (galvanic) nature protects the immediately adjacent steel across a small gap — but the cut edge itself is no longer coated. For an enclosure that lives indoors that is a non-issue; for a part exposed to weather or washdown, a zinc-rich touch-up along the cut edges restores full protection.
We cut galvanized with nitrogen or compressed air rather than oxygen, to keep the edge clean and avoid adding oxidation. The zinc can leave the edge slightly rougher than bare mild steel and can throw a little spatter near the kerf, both of which we tune out for the gauge being run.
Applications by industry
Galvanized earns its place wherever a part needs corrosion resistance but not a cosmetic finish. In HVAC and mechanical work it is duct brackets, supports, and framing. In electronics and data center installations it is cable trays, mounting rails, and equipment back-panels. In smart automation and outdoor kiosks it is enclosures and sub-panels that sit outside without a paint line. The common thread: pre-coated stock means the part skips the finishing department entirely, which is a real cost and lead-time saving when a bare-metal edge is acceptable.
Design tips for galvanized laser-cut parts
- Decide whether cut edges need protection. For corrosive service, note a zinc-rich edge touch-up on the drawing.
- Keep cosmetic expectations realistic. Galvanized has a spangled or matte metallic look, not a Class-A painted face — spec pre-painted or stainless if appearance drives the part.
- Choose the coating weight for the environment. G90 carries more zinc than G60 for harsher exposure; galvannealed takes paint better if you do intend to coat.
- Group with weldments carefully. Welding galvanized burns off zinc at the weld and releases fume; flag any welded features so the assembly is planned for it.
When another process fits better
- Cosmetic finished faces. If the visible surface must be uniformly colored, pre-painted (coil-coated) stock, cold-rolled steel plus a paint line, or stainless is the better substrate.
- Aggressive corrosion or salt. For marine or washdown-chemical service, 316 stainless outlasts galvanized.
- Fully coated part anyway. If the part gets powder coated for looks regardless, plain mild steel plus coating can be cheaper than paying for zinc under the paint.
Quoting a galvanized part
Send a DXF or STEP with the coating class (G60, G90, galvanneal), thickness, and quantity to our quote page. We confirm the cut, advise on edge protection, and quote from a single prototype to a 50,000-piece run out of our ISO 9001:2015 shop in Las Vegas.