Duplex Stainless Steel Sheet
At Stellanox Steel, we manufacture and supply high-strength Duplex Stainless Steel Round Bars engineered for superior corrosion resistance, exceptional mechanical strength, and outstanding performance across demanding applications.
Our duplex round bars are the material of choice in industries like offshore oil & gas, chemical processing, marine structures, energy generation, and heavy engineering — wherever strength, durability, and corrosion resistance are critical.
What are Duplex Stainless Steel Round Bars?
Duplex Stainless Steel Round Bars are solid cylindrical bars made from duplex-grade alloys, featuring a 50/50 austenitic-ferritic microstructure.
This combination gives duplex round bars approximately twice the strength of austenitic stainless steels like 304/316, alongside excellent resistance to chloride-induced corrosion, stress corrosion cracking, and erosion.
With their strength and corrosion resistance, duplex bars are used in the manufacture of shafts, fasteners, pump components, structural supports, and machined parts exposed to harsh environments.
| Products |
|---|
|
Stainless Steel |
|
Carbon Steel |
|
Duplex Stainless Steel |
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Super Duplex Stainless Steel |
|
Alloy Steel |
|
Titanium |
|
Hastelloy |
|
Inconel |
|
Monel |
|
Aluminium |
|
Copper |
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Pure Nickel |
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Flanges |
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Forged Fittings |
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Valves |
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Fasteners |
Key Features
- High Mechanical Strength: Double the yield strength compared to 300-series stainless steels.
- Superior Corrosion Resistance: Especially against pitting, crevice corrosion, and chloride stress cracking.
- Excellent Weldability and Fabricability: Suitable for machining, forging, and welding operations.
- Outstanding Fatigue Strength: Reliable under cyclic and dynamic mechanical loads.
- Enhanced Resistance to Erosion and Abrasion: Ideal for high-velocity fluid handling systems.
- Good Performance at Low Temperatures: Maintains toughness even at cryogenic conditions.
Grades
Specifications
| Property | Details |
|---|---|
|
Product
|
Duplex Stainless Steel Round Bars
|
|
Common Grades |
UNS S31803 (2205), UNS S32205, UNS S32750 (2507), UNS S32760
|
|
Manufacturing Standards
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ASTM A276, ASTM A479, EN 10088-3, JIS G4303
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Diameter Range
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5 mm to 600 mm (custom sizes available)
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Length Range
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3 meters, 6 meters, 9 meters, or cut-to-length
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Surface Finish Options
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Hot Rolled, Cold Drawn, Peeled, Turned, Ground, Polished
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Condition Options
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Annealed, Solution Annealed and Pickled, Bright Bars
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Tolerance
|
h9, h10, h11, or as per customer specification
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Testing and Certification
|
Ultrasonic Test (UT), MPI, PMI, EN 10204 3.1/3.2 Certification, NACE Compliance
|
Chemical Composition
| Element | Composition (%) |
|---|---|
|
Carbon (C) |
≤ 0.030
|
|
Chromium
Cr |
21.0 – 23.0
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Nickel
Ni
|
4.5 – 6.5
|
|
Molybdenum
Mo
|
2.5 – 3.5
|
|
Nitrogen
N
|
0.08 – 0.20
|
|
Manganese
Mn
|
≤ 2.0
|
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Silicon
Si
|
≤ 1.0
|
|
Phosphorus
P
|
≤ 0.030
|
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Sulfur
S
|
≤ 0.020
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|
Iron
Fe
|
Balance |
Mechanical Properties
| Property | Value |
|---|---|
|
Tensile Strength (MPa)
|
≥ 620
|
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Yield Strength 0.2% Proof (MPa)
|
≥ 450
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Elongation (%)
|
≥ 25
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Hardness (Brinell HB)
|
≤ 290
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Impact Energy (Charpy V-notch)
|
≥ 100 Joules @ -46°C
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Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
|
ASTM |
A240 (Plate/Sheet), A790 (Pipe)
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UNS
|
S31803 (2205), S32205 (2205 improved)
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EN
|
1.4462
|
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DIN
|
X2CrNiMoN22-5-3
|
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JIS
|
SUS 329J3L
|
Weight Chart (kg/m²)
| Diameter (mm) | Weight per Meter (kg) | Weight per 3 m (kg) | Weight per 6 m (kg) |
|---|---|---|---|
|
10
|
0.61
|
1.83
|
3.66
|
|
12
|
0.88
|
2.64
|
5.28
|
|
16
|
1.56
|
4.68
|
9.36
|
|
20
|
2.44
|
7.32
|
14.64
|
|
25
|
3.82
|
11.46
|
22.92
|
|
30
|
5.50
|
16.50
|
33.00
|
|
40
|
9.77
|
29.31
|
58.62
|
|
50
|
15.27
|
45.81
|
91.62
|
|
60
|
22.01
|
66.03
|
132.06
|
Applications in Various Industries
Stellanox Steel’s products are valued for their strength, machinability, and cost-effectiveness across multiple sectors:
Benefits
- High Load-Bearing Capacity: Allows use of smaller, lighter components without compromising strength.
- Superior Corrosion Resistance: Performs excellently in saline, acidic, and chloride-rich environments.
- Excellent Workability: Can be machined, turned, milled, and welded easily.
- Long Service Life: Reduces maintenance and replacement costs over time.
- Resistant to Erosion and Abrasion: Extends product life even in high-velocity fluid environments.
- Environmentally Friendly: Duplex stainless steel is fully recyclable.
Frequently Asked Questions
Duplex bars offer twice the strength and much better resistance to chloride-induced stress corrosion cracking compared to 316 stainless steel.
Yes. Due to their outstanding resistance to seawater corrosion and high mechanical strength, they are widely used in offshore and marine applications.
Yes, duplex bars are machinable, though tool selection and cutting speeds must be carefully optimized due to their high strength.
We offer hot-rolled, cold-drawn, peeled, polished, and centerless ground finishes depending on application requirements.
2025 Stellanox Steel |