🟦 Product Overview
Duplex (2205) and Super Duplex (2507) Stainless Steel Bars combine the advantages of:
- Austenitic stainless steel (excellent corrosion resistance)
- Ferritic stainless steel (high strength, stress‑corrosion resistance)
These grades offer:
- Very high yield strength (2× stronger than 304/316)
- Outstanding pitting & crevice corrosion resistance
- Excellent resistance to chloride stress corrosion cracking
- Superior performance in seawater & chemical environments
They are widely used in:
- Offshore & marine engineering
- Chemical processing
- Oil & gas equipment
- Pressure vessels
- Heat exchangers
- Desalination plants
🟦 Standards
- ASTM A276
- ASTM A479
- EN 10088
- UNS S32205 / S31803 (2205)
- UNS S32750 (2507)
🟦 Grades Included
- 2205 (UNS S32205 / S31803) — Standard Duplex
- 2507 (UNS S32750) — Super Duplex with higher Cr/Mo/N for extreme corrosion resistance
🟦 Product Specifications & Available Sizes
Shapes Available
- Round Bar
- Square Bar
- Hex Bar
- Flat Bar
Diameter Range
Length
Surface Conditions
- Hot Rolled
- Cold Drawn
- Peeled / Turned
- Polished
🟦 Chemical Composition Comparison
| Grade | Cr (%) | Ni (%) | Mo (%) | N (%) | Mn (%) | C (%) |
|---|
| 2205 | 21–23 | 4.5–6.5 | 2.5–3.5 | 0.14–0.20 | ≤ 2.00 | ≤ 0.030 |
| 2507 | 24–26 | 6.0–8.0 | 3.0–5.0 | 0.24–0.32 | ≤ 1.20 | ≤ 0.030 |
🟦 Mechanical Properties Comparison
| Grade | Tensile Strength | Yield Strength | Elongation | Hardness |
|---|
| 2205 | ≥ 620 MPa | ≥ 450 MPa | ≥ 25% | ≤ 290 HB |
| 2507 | ≥ 800 MPa | ≥ 550 MPa | ≥ 25% | ≤ 310 HB |
| Environment | 2205 | 2507 |
|---|
| Chloride SCC | Excellent | Superior |
| Pitting Resistance | Very High | Extremely High |
| Seawater | Excellent | Outstanding |
| Acidic Environments | High | Very High |
🟦 Physical Properties
| Property | Value |
|---|
| Density | 7.80 g/cm³ |
| Magnetic | Slightly magnetic |
| Thermal Conductivity | Higher than austenitic grades |
| Stress Corrosion Cracking Resistance | Excellent |
🟦 Manufacturing Processes
- Hot Rolling
- Cold Drawing
- Turning / Peeling
- Grinding / Polishing
- Straightening
- Ultrasonic Testing
🟦 Primary Industry Usage
- Offshore platforms
- Marine engineering
- Chemical processing plants
- Oil & gas pipelines
- Heat exchangers
- Desalination systems
- Pressure vessels
🟦 Why Use Duplex & Super Duplex Stainless Steel Bar
- 2× strength of 304/316
- Exceptional corrosion resistance
- Excellent chloride SCC resistance
- Ideal for harsh, corrosive environments
- Long service life with low maintenance
🟦 Why Choose WelSteels
- Full range of 2205 & 2507
- Hot rolled & cold drawn options
- MTC 3.1 + third‑party inspection
- Export‑grade packaging
- Competitive pricing for global projects
