2205 stainless steel vs 316: What’s the difference?
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If you're comparing 2205 duplex stainless steel and 316 stainless steel for your next project, both grades are commonly used in marine, chemical, and structural applications. Let's explore their differences, use cases, and common issues to help you make the right choice.
What is Grade 2205 Stainless Steel Equivalent To?
Grade 2205 (UNS S32205 / S31803) is equivalent to:
EN 1.4462
ASTM A240 / A789
DIN X2CrNiMoN22-5-3
It's a duplex grade with better mechanical strength and chloride resistance than 316L or even 904L in some cases.
2205 stainless steel vs 316:Chemical Composition Comparison (% by weight)
| Element | 2205 Duplex Stainless Steel (EN 1.4462) | 316 Stainless Steel (EN 1.4401) |
|---|---|---|
| Carbon (C) | ≤ 0.03 | ≤ 0.08 |
| Chromium (Cr) | 22.0 – 23.0 | 16.0 – 18.0 |
| Nickel (Ni) | 4.5 – 6.5 | 10.0 – 14.0 |
| Molybdenum (Mo) | 3.0 – 3.5 | 2.0 – 2.5 |
| Nitrogen (N) | 0.14 – 0.20 | ≤ 0.10 |
| Manganese (Mn) | ≤ 2.0 | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 | ≤ 1.0 |
| Phosphorus (P) | ≤ 0.03 | ≤ 0.045 |
| Sulfur (S) | ≤ 0.01 | ≤ 0.03 |
2205 stainless steel vs 316: Mechanical Properties
| Property | 2205 Duplex Stainless Steel (EN 1.4462) | 316 Stainless Steel (EN 1.4401) |
|---|---|---|
| Tensile Strength (MPa) | ≥ 620 | 515 – 720 |
| Yield Strength (MPa) | ≥ 450 | ≥ 205 |
| Elongation (%) | ≥ 25 | ≥ 40 |
| Hardness (HB) | ≤ 320 | ≤ 200 |
| Modulus of Elasticity (GPa) | ~200 | ~193 |
What is the Difference Between Duplex 2205 and 316?
Differences in organizational structure:
2205 is a duplex stainless steel, composed of about 50% austenite + 50% ferrite, and the two-phase structure works synergistically; 316 is a single-phase austenitic stainless steel, with a stable austenitic structure at room temperature.
Corrosion resistance:
2205 stainless steel has stronger resistance to pitting, crevice corrosion, and stress corrosion, especially in high-chlorine environments (such as concentrated seawater, high-temperature chlorine-containing media), far exceeding 316, and the pitting resistance equivalent (PREN≈32) is significantly higher than 316 (PREN≈25).
316 stainless steel is resistant to general atmosphere, weak acid and alkali, and medium-chlorine environments (such as ordinary seawater, food processing), but its corrosion resistance is not as good as 2205 in extreme high-chlorine or high-temperature and high-pressure corrosion environments.
Processing performance:
316 stainless steel has better plasticity, and is easier to process in welding, bending, stamping, etc.; 2205 requires greater external force due to its high strength, and heat input needs to be controlled during welding to prevent embrittlement caused by excessive ferrite.
How Much is Duplex 2205 vs 316?
316 Stainless Steel Sheet: ~$2,800–$3,200 per metric ton
2205 Duplex Stainless Steel Sheet: ~$3,200–$3,800 per metric ton
Though 2205 is ~10–20% more expensive, its higher strength can reduce material usage, especially in pressure vessels, tanks, and structural supports.
How to Weld 2205 Duplex Stainless Steel?
Welding 2205 requires care to preserve its duplex structure:
Filler Metal: Use ER2209 or equivalent
Shielding Gas: Pure Argon or Ar/N2 blends; sometimes Ar+2% O₂ for TIG
Heat Input: Control heat input (0.5–2.5 kJ/mm) to avoid sigma phase formation
Interpass Temperature: Keep below 150°C
Post-Weld Cleaning: Pickling or passivation improves corrosion performance
GNEE offers both 316 and 2205 stainless steel in sheet, coil, plate, and pipe form-with competitive prices, fast delivery, and custom processing. Contact our team today for a free quote or material recommendation.
Fully Compliant:
All products meet South American and European export standards and are certified by ASTM, EN and other relevant certifications.
Reliable supply chain
Efficient delivery cycle: 20-25 days for production + 30-35 days for shipping (e.g., an order placed now will arrive in early September).
