Duplex Stainless Steel Plate
At Stellanox Steel, we offer premium-grade Duplex Stainless Steel Plates crafted for extreme strength, outstanding corrosion resistance, and reliable performance in the toughest environments. Manufactured to meet global standards, our duplex plates are ideal for critical industrial sectors including oil & gas, chemical processing, marine engineering, desalination plants, and high-load structural applications.
With excellent mechanical properties, cost efficiency, and enhanced durability, Stellanox Steel’s duplex plates are the preferred choice for both heavy-duty and high-corrosion environments.
What are Duplex Stainless Steel Plates?
Duplex Stainless Steel Plates are heavy, flat-rolled steel products made from duplex-grade stainless alloys, combining the strengths of austenitic and ferritic microstructures.
Thanks to their balanced metallurgical structure, duplex plates offer twice the strength of conventional stainless steels, excellent resistance to pitting and stress corrosion cracking, and outstanding fatigue strength.
Their high strength allows engineers to reduce plate thickness, which lowers overall material weight and cost without compromising structural integrity — making them perfect for offshore platforms, storage tanks, heavy machinery, and pressure vessels.
| 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
- High Yield Strength: Double the yield strength of 300-series stainless steels.
- Superior Corrosion Resistance: Exceptional resistance to pitting, crevice, and chloride stress corrosion.
- Excellent Weldability and Workability: Suitable for forming, welding, and machining processes.
- Reduced Material and Structural Weight: Enables cost savings and lighter designs.
- High Fatigue Resistance: Performs reliably under cyclic and dynamic loading conditions.
- Outstanding Toughness at Low Temperatures: Ideal for Arctic, offshore, and cryogenic applications.
Grades
Specifications
| Property | Details |
|---|---|
|
Product
|
Duplex Stainless Steel Plate
|
|
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
|
3 mm to 150 mm
|
|
Width Range
|
1000 mm to 3000 mm
|
|
Length Range
|
2000 mm to 12000 mm (custom cut-to-size available)
|
|
Surface Finish Options
|
Hot Rolled, Annealed & Pickled (HRAP), Polished, Brushed
|
|
Heat Treatment
|
Solution Annealed and Rapid Quenched
|
|
Edge Condition
|
Mill Edge, Trimmed Edge
|
|
Testing and Certification
|
NACE MR0175, EN 10204 3.1 / 3.2 Certification, 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) |
|---|---|---|---|
|
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
|
|
8.0
|
62.40
|
195.00
|
185.46
|
|
10.0
|
78.00
|
243.75
|
231.82
|
|
12.0
|
93.60
|
292.50
|
278.18
|
|
16.0
|
124.80
|
390.00
|
370.91
|
|
20.0
|
156.00
|
487.50
|
463.64
|
|
25.0
|
195.00
|
609.38
|
579.55
|
|
30.0
|
234.00
|
731.25
|
695.46
|
|
40.0
|
312.00
|
975.00
|
927.28
|
|
50.0
|
390.00
|
1,218.75
|
1,159.10
|
Applications in Various Industries
Stellanox Steel’s products are valued for their strength, machinability, and cost-effectiveness across multiple sectors:
Benefits
- Superior Strength and Load Capacity: Supports heavy structures with reduced plate thickness.
- Outstanding Corrosion Resistance: Especially in chloride-containing and harsh chemical environments.
- Reduced Weight and Material Costs: Less thickness needed compared to standard stainless steels.
- Excellent Resistance to Fatigue and Impact Loads: Ideal for dynamic and offshore applications.
- Good Workability and Weldability: Facilitates fabrication and on-site installation.
- Eco-Friendly and Sustainable: 100% recyclable material for green building and industrial initiatives.
Frequently Asked Questions
Duplex plates offer roughly twice the strength and better corrosion resistance in aggressive environments like marine and offshore compared to 316 stainless steel plates.
Yes, duplex plates maintain good toughness and impact resistance even at very low temperatures.
Yes, with proper procedures and controlled heat input, duplex plates can be cut, machined, and welded without issues.
Super Duplex (e.g., S32750) has even higher strength and better corrosion resistance than standard Duplex 2205, and is used in more extreme conditions like deepwater offshore oil platforms.
2025 Stellanox Steel |