Reviewed · 2026-08-03
Galvanized & Coated Steel
Galvanized and coated steels combine a selected steel substrate with zinc, zinc-alloy and/or organic coating systems. Batch galvanizing after fabrication, continuous metallic-coated sheet, electrogalvanized sheet and prepainted coil use different processes, designations, standards and durability assumptions.
Classification basis
This is a commercial coating-system collection rather than one metallurgical alloy family.
Choose the coating process first, then specify substrate, coating designation, surface treatment, fabrication and exposure.
A familiar grade name never replaces the governing product specification and certified documentation.01
Explore subcategories
Batch Hot-Dip Galvanized Steel
Do not transfer coating designations, thickness assumptions or warranties between batch, continuous, electrolytic and prepainted processes.
→Coated steelContinuous Galvanized Steel
Do not transfer coating designations, thickness assumptions or warranties between batch, continuous, electrolytic and prepainted processes.
→Coated steel55% Al-Zn / Aluzinc Coated Steel
Do not transfer coating designations, thickness assumptions or warranties between batch, continuous, electrolytic and prepainted processes.
→Coated steelElectrogalvanized Steel
Do not transfer coating designations, thickness assumptions or warranties between batch, continuous, electrolytic and prepainted processes.
→Coated steelPPGI — Prepainted Galvanized Steel
Do not transfer coating designations, thickness assumptions or warranties between batch, continuous, electrolytic and prepainted processes.
→Coated steelPPGL — Prepainted Al-Zn Coated Steel
Do not transfer coating designations, thickness assumptions or warranties between batch, continuous, electrolytic and prepainted processes.
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Representative grades and systems
| Grade / system | Use as a selection entry point |
|---|---|
| ASTM A123/A153 | Decide whether coating occurs before or after fabrication. |
| ASTM A653 G30–G235 | Define exposure category, target life, appearance, forming and joining route. |
| EN 10346 Z100–Z600 | Select substrate, metallic coating and paint system as one compatible stack. |
| ASTM A792 AZ50/AZ150 | Decide whether coating occurs before or after fabrication. |
| ASTM A879 | Define exposure category, target life, appearance, forming and joining route. |
| PPGI | Select substrate, metallic coating and paint system as one compatible stack. |
| PPGL | Decide whether coating occurs before or after fabrication. |
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Property framework
Durability depends on coating chemistry and amount, environment, design, fabrication damage and maintenance.
Coating mass designations are not universal one-side thickness values.
Cut edges, welds, fasteners, drainage, contact metals and wet storage can control early failure.
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Common product forms
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Applications
- Roofing, cladding, deck and building systems
- Infrastructure, utility, agricultural and industrial structures
- Automotive, appliances, cabinets and general formed products
- Decide whether coating occurs before or after fabrication.
- Define exposure category, target life, appearance, forming and joining route.
- Select substrate, metallic coating and paint system as one compatible stack.
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Standards and designation systems
ASTM A123/A153 and ISO 1461 address batch hot-dip galvanized products within their scopes.
ASTM A653/A792/A879 and EN 10346 distinguish continuous zinc, Al-Zn and electrogalvanized sheet systems.
Prepainted coil specifications add paint, testing and performance requirements to the metallic-coated substrate.
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Procurement checklist
- Specify steel substrate, strength/forming class, metallic coating type and mass/thickness designation.
- For prepainted products, define pretreatment, primer, top/back coat, dry-film thickness, color/gloss and exposure.
- State surface treatment, passivation/oiling, inspection, packing, moisture protection, traceability and warranty basis.
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Sources and editorial review
American Galvanizers Association · ASTM specification guide, accessed 2026
GalvInfo Center / International Zinc Association · Technical bulletin collection, accessed 2026
GalvInfo Center / International Zinc Association · Coated-sheet standards index, accessed 2026