Duplex Stainless Steel Plate
Premium-grade duplex stainless steel plates that are designed for exceptional strength, exceptional resistance to corrosion, and dependable performance in the most demanding conditions are available from Stellanox Steel. Our duplex plates, which are made in accordance with international standards, are perfect for high-load structural applications, chemical processing, oil and gas, maritime engineering, and desalination plants, among other vital industrial sectors.
Duplex plates from Stellanox Steel are the best option for heavy-duty and highly corrosive settings due to its superior mechanical qualities, affordability, and increased durability.
What are Duplex Stainless Steel Plates?
Made from duplex-grade stainless alloys, which combine the advantages of ferritic and austenitic microstructures, duplex stainless steel plates are hefty, flat-rolled steel products.
Duplex plates have twice the strength of traditional stainless steels, exceptional fatigue strength, and superior resistance to pitting and stress corrosion cracking because of their balanced metallurgical structure.
They are ideal for offshore platforms, storage tanks, heavy machinery, and pressure vessels because of their great strength, which enables engineers to reduce plate thickness without sacrificing structural integrity. This results in a reduction in overall material weight and cost.
| 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: Stainless steels from the 300 series have double the yield strength.
- Superior Corrosion Resistance: Outstanding defence against corrosion caused by pitting, crevices, and chloride stress.
- Outstanding Workability and Weldability: Fit for machining, welding, and forming operations.
- Lighter designs and economic savings are made possible by reduced material and structural weight.
- High Fatigue Resistance: Consistently functions under dynamic and cyclic loading circumstances.
- Superior Durability at Low Temperatures: Perfect for cryogenic, offshore, and Arctic 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)
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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 |