Stainless Steel Flange Material Selection: 304, 316, 321, 347, 904L, 2205 Compared
Stainless Steel Flange Material Selection Guide
Published: April 10, 2026 | Category: Materials
Quick Selection Matrix
| Grade | Best For | Max Temp | Cost |
|---|---|---|---|
| 304/L | General purpose | 870°C | $ |
| 316/L | Marine, chemical | 870°C | $$ |
| 321 | High temperature | 925°C | $$ |
| 347 | Extreme heat | 925°C | $$$ |
| 904L | Sulfuric acid | 400°C | $$$$ |
| 2205 | Offshore | 300°C | $$$ |
Grade 304/L (A2 Stainless)
18% Cr, 8% Ni. Most widely used. Applications: food processing, pharmaceutical, architectural.
Grade 316/L (A4 Stainless)
16% Cr, 10% Ni, 2% Mo. Superior chloride resistance. Applications: offshore, marine, chemical.
Grade 321 (Titanium Stabilized)
Excellent for 400-900°C. Applications: aircraft exhaust, boilers, heat exchangers.
Grade 347 (Niobium Stabilized)
Superior creep strength. Applications: jet engines, power plants, nuclear.
Grade 904L (Super Austenitic)
20% Cr, 25% Ni, 4.5% Mo. Exceptional acid resistance. Applications: sulfuric acid, seawater.
Grade 2205 (Duplex)
22% Cr, 5% Ni, 3% Mo. 2x yield strength. Applications: offshore, desalination.
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