Duplex Stainless Steel Sheet
At Stellanox Steel, we manufacture and supply premium-quality Duplex Stainless Steel Sheets designed for superior strength, excellent corrosion resistance, and exceptional durability. Engineered to meet the demands of the world’s most aggressive environments, our duplex sheets are widely trusted in industries like oil & gas, chemical processing, marine engineering, water treatment, and infrastructure projects.
With superior mechanical properties and corrosion resistance compared to conventional stainless steel, Stellanox Steel’s duplex sheets offer a cost-effective, high-performance solution for critical applications.
What are Duplex Stainless Steel Sheets?
Duplex Stainless Steel Sheets are flat-rolled products that feature a balanced microstructure of austenite and ferrite phases.
This dual-phase structure provides a unique combination of high strength, excellent resistance to pitting and stress corrosion cracking, and enhanced fatigue resistance — all in a material lighter and thinner than traditional stainless steels.
Duplex sheets allow for weight savings, reduced fabrication costs, and longer service life, making them an optimal choice for environments involving exposure to chlorides, corrosive chemicals, or extreme temperature fluctuations.
| Products |
|---|
|
Stainless Steel |
|
Carbon Steel |
|
Duplex Stainless Steel |
|
Super Duplex Stainless Steel |
|
Alloy Steel |
|
Titanium |
|
Hastelloy |
|
Inconel |
|
Monel |
|
Aluminium |
|
Copper |
|
Pure Nickel |
|
Flanges |
|
Forged Fittings |
|
Valves |
|
Fasteners |
Key Features
- Double the Strength: Approximately twice the yield strength of 300-series austenitic stainless steels.
- Outstanding Corrosion Resistance: Superior performance against pitting, crevice corrosion, and chloride stress cracking.
- Good Weldability and Fabrication: Suitable for bending, rolling, welding, and machining.
- Reduced Weight in Structural Designs: Allows thinner sections without compromising strength.
- Long-Term Service Life: Excellent resistance to fatigue, erosion, and corrosion, minimizing downtime.
- Cost-Effective Alternative: High performance with lower nickel and molybdenum content than high-end alloys.
Grades
Specifications
| Property | Details |
|---|---|
|
Product
|
Duplex Stainless Steel Sheet
|
|
Common Grades |
UNS S31803 (2205), UNS S32205, UNS S32750 (2507), UNS S32760
|
|
Manufacturing Standards
|
ASTM A240, ASME SA240, EN 10088-2, JIS G4304
|
|
Thickness Range
|
0.5 mm to 50 mm
|
|
Width Range
|
1000 mm to 2500 mm
|
|
Length Range
|
2000 mm to 6000 mm (Custom cuts available)
|
|
Surface Finish Options
|
2B, No.1 (HRAP), No.4 (Brushed), BA (Bright Annealed), Mirror
|
|
Heat Treatment
|
Solution Annealed and Quenched
|
|
Edge Condition
|
Mill Edge, Slit Edge
|
|
Testing and Certification
|
EN 10204 3.1 / 3.2 Certification, NACE MR0175, ASTM Compliance
|
Chemical Composition
| Element | Composition (%) |
|---|---|
|
Carbon (C) |
≤ 0.030
|
|
Chromium
Cr |
21.0 – 23.0
|
|
Nickel
Ni
|
4.5 – 6.5
|
|
Molybdenum
Mo
|
2.5 – 3.5
|
|
Nitrogen
N
|
0.08 – 0.20
|
|
Manganese
Mn
|
≤ 2.0
|
|
Silicon
Si
|
≤ 1.0
|
|
Phosphorus
P
|
≤ 0.030
|
|
Sulfur
S
|
≤ 0.020
|
|
Iron
Fe
|
Balance |
Mechanical Properties
| Property | Value |
|---|---|
|
Tensile Strength (MPa)
|
≥ 620
|
|
Yield Strength 0.2% Proof (MPa)
|
≥ 450
|
|
Elongation (%)
|
≥ 25
|
|
Hardness (Brinell HB)
|
≤ 290
|
|
Impact Energy (Charpy V-notch)
|
≥ 100 Joules @ -46°C
|
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
|
ASTM |
A240 (Plate/Sheet), A790 (Pipe)
|
|
UNS
|
S31803 (2205), S32205 (2205 improved)
|
|
EN
|
1.4462
|
|
DIN
|
X2CrNiMoN22-5-3
|
|
JIS
|
SUS 329J3L
|
Weight Chart (kg/m²)
| Thickness (mm) | Weight per m² (kg) | Weight per 1.25 × 2.5 m (kg) | Weight per 4' × 8' (kg) |
|---|---|---|---|
|
0.5
|
3.90
|
12.19
|
11.59
|
|
1.0
|
7.80
|
24.38
|
23.18
|
|
1.5
|
11.70
|
36.56
|
34.77
|
|
2.0
|
15.60
|
48.75
|
46.36
|
|
2.5
|
19.50
|
60.94
|
57.95
|
|
3.0
|
23.40
|
73.13
|
69.55
|
|
4.0
|
31.20
|
97.50
|
92.73
|
|
5.0
|
39.00
|
121.88
|
115.91
|
|
6.0
|
46.80
|
146.25
|
139.09
|
Applications in Various Industries
Stellanox Steel’s products are valued for their strength, machinability, and cost-effectiveness across multiple sectors:
Benefits
- Superior Strength-to-Weight Ratio: Enables thinner, lighter structures without loss of performance.
- Enhanced Corrosion and Fatigue Resistance: Reduces maintenance costs and extends service life.
- Excellent Stress Corrosion Cracking Resistance: Particularly in chloride-rich environments.
- Highly Economical Long-Term Solution: Lower material costs and longer service life than super austenitic stainless steels.
- Versatile Surface Finishes: Available in polished, brushed, and bright finishes for aesthetic or functional applications.
- Eco-Friendly: Fully recyclable material supporting sustainable building and manufacturing practices.
Frequently Asked Questions
Duplex sheets offer significantly higher strength, better pitting resistance, and superior stress corrosion cracking resistance compared to standard 304 or 316 stainless steel sheets.
Yes, duplex sheets are partially magnetic due to their ferritic content.
Yes. They offer good weldability and can be fabricated using common methods, but controlled procedures are recommended to maintain phase balance.
We offer 2B, No.1 (HRAP), No.4 (brushed), BA (bright annealed), and mirror finishes, depending on the application.
2025 Stellanox Steel |