Carbon steel sheet with a zinc coating applied before fabrication. Outdoor enclosures, HVAC ducting, structural panels — anywhere you want steel's strength and affordability plus outdoor corrosion resistance without post-fabrication galvanizing. G60 and G90 coating weights stocked.
Zinc coating life is roughly proportional to coating weight. G90 lasts 50% longer than G60 in the same environment.
| Environment | G60 life | G90 life |
|---|---|---|
| Indoor dry | >50 years | >75 years |
| Outdoor rural | 25–35 years | 40–50 years |
| Outdoor urban | 15–20 years | 20–30 years |
| Outdoor coastal | 5–10 years | 10–15 years |
For outdoor parts, G90 is standard. Indoor HVAC or dry-environment enclosures use G60. For marine or coastal service, switch to stainless steel or specify G210 (very heavy galvanize — limited availability).
Galvanized steel has two fabrication challenges:
Welding burns off zinc at the weld. The weld zone becomes unprotected steel. Options: (1) apply zinc-rich paint to weld after cool; (2) cold-galvanize spray; (3) avoid welding near critical exposure zones.
Cut edges are bare steel. Laser-cut or sheared edges lose the zinc coating. For 1 mm gap, zinc self-heals via galvanic action (nearby zinc protects the bare steel). For larger exposed edges, edge-paint with zinc primer.
Specify G60 (indoor) or G90 (outdoor) on your quote. We cut, bend, and assemble — post-weld touch-up included.
Start a quote →