2205 vs 2507 Duplex Stainless Steel: Choosing Your Industrial Champion
When selecting stainless steel for demanding applications, duplex grades 2205 and 2507 often top the list.
Here’s how to pick the right one for your project.
The Core Difference: What the Numbers Mean
The Core Difference: What the Numbers Mean
2205: Contains ~22% chromium + 3% molybdenum
2507: Boosts this to ~25% chromium + 4% molybdenum + extra nitrogen
Performance Face-Off
| eature | 2205 | 2507 |
| Corrosion Resistance | Handles moderate chloride environments | Defeats extreme saltwater/chemical exposure |
| Strength | 450 MPa yield strength | 700 MPa yield strength (55% stronger) |
| Temperature Limit | Safe to 300°F (150°C) | Handles 400°F+ (200°C+) |
Where Each Shines
2205's Best Applications
Coastal water treatment plants
Food processing equipment
Bridge components
Cost-effective structural parts
Where 2507 Dominates
Offshore oil rig components
Seawater desalination plants
Nuclear waste containment
Concentrated sulfuric acid systems
Deep-sea mining equipment
Real-World Durability Differences
In tropical seawater environments:
2205 lasts 5-7 years before pitting
2507 withstands 12-15+ years
(Based on accelerated salt spray testing)
The Fabrication Factor
Working with 2205
Welds easily with standard techniques
Forgiving for bending and forming
Ideal for shops without specialty equipment
Handling 2507
Requires controlled welding temperatures
Needs high-purity shielding gases
Best left to experienced fabricators
Slow forming prevents cracking
How to choose?
What’s the environment?
Chlorides under 5,000 ppm? → 2205
Saltwater immersion or high chlorides? → 2507
Budget vs lifespan?
Tight budget + 5-year need? → 2205
Critical infrastructure + 10+ year need? → 2507
Who’s fabricating it?
General workshop? → Stick with 2205
Specialty metals shop? → Consider 2507
The Final Word
Neither grade is “better” – just better suited:
2205 = Cost-effective workhorse for most industrial jobs
2507 = Premium performer for extreme environments
At Walmay Steel, we stock both grades and help engineers select the optimal solution.
Tabs:2205 stainless steel coil,2507 ss sheet
Have Any Question?
High-quality manufacturers in the stainless steel industry, feel free to ask
