Galvanized Steel vs Stainless Steel: When to Use Which?
Both resist corrosion, but they work differently. Choosing wrong can cost thousands in premature failure.
Corrosion Mechanism
Galvanized: Zinc coating sacrificially protects steel. Once consumed, rust begins. Z275 provides 20-50 years in rural air. Stainless: Chromium oxide layer self-heals when damaged. Essentially indefinite protection.
Cost
Galvanized costs 30-50% more than bare carbon steel. 304 SS costs 3-4x carbon steel. For large projects with moderate conditions, galvanized offers best value.
Temperature
Galvanized limited to 200 C. Stainless (304) handles 870 C, 310S up to 1150 C. High-temp = stainless only.
Decision Guide
| Factor | Galvanized | Stainless |
|---|---|---|
| Cost | Low | High (3-4x) |
| Life | 20-50 years | Indefinite |
| Max Temp | 200 C | 870-1150 C |
| Appearance | Matte grey | Bright silver |
| Best Use | Roofing, fencing | Food, chemical, marine |
CoreMetal supplies both. Contact us for recommendations.
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