UNS S31803 Duplex Bar
UNS S31803 Duplex Stainless Steel Bars – Superior Strength & Corrosion Resistance
High-Performance Duplex Steel for Demanding Industrial Applications
Lork Group is a trusted global supplier and exporter of premium UNS S31803 (1.4462 / F51) Duplex Stainless Steel Bars, offering exceptional cost-performance efficiency. Our duplex steel bars combine high strength, excellent corrosion resistance, and lightweight durability, making them ideal for harsh environments where standard austenitic steels fall short.
Key Features of UNS S31803 Duplex Bars
- 22% Chromium Duplex Structure – Balanced austenitic-ferritic microstructure for enhanced strength and corrosion resistance.
- Double the Strength of Standard Austenitic Stainless Steels – Higher load capacity with reduced material thickness.
- Superior Corrosion Resistance – Resists chloride stress corrosion cracking (SCC), pitting, and sulphide stress corrosion.
- Good Weldability – Compatible with TIG, MIG, and arc welding processes (oxyacetylene welding not recommended).
- Lightweight & Cost-Effective – Ideal for applications requiring high strength-to-weight ratios.
Specification
|
Dimensions |
EN, DIN, JIS, ASTM, BS, ASME, AISI |
|
Wire |
Thickness starting from 0.05mm |
|
Round bar size |
Diameter: 3-~800mm |
|
Hex Bar size |
2-100mm A/F |
|
Flat bar size |
Thickness: 2 -100mm / Width: 10 to 500mm |
|
Square bar size |
4 to 100mm |
|
Rectangular Bars Size |
33 x 30mm to 295 x 1066mm |
|
Hollow Bar |
32mm OD x 16mm ID to 250mm OD x 200mm ID |
|
Tolerance |
H8, H9, H10, H11, H12, H13K9, K10, K11, K12 or as per clients' requirements |
|
Finish |
Black, Bright Polished, Rough Turned, NO.4 Finish, Matt Finish, BA Finish |
Chemical Composition
|
Element |
Content (%) |
|
Mo |
2.50-3.50 |
|
Mn |
2.0 |
|
Si |
1.0 |
|
N |
0.080-0.20 |
|
Fe |
63.75-71.92 |
|
Cr |
21.0-23.0 |
|
Ni |
4.50-6.50 |
|
C |
0.030 |
|
P |
0.030 |
|
S |
0.020 |
Mechanical Composition
|
Properties |
Metric |
Imperial |
|
Elongation at break (in 50 mm) |
25.0 % |
25.0 % |
|
Hardness, Brinell |
293 |
293 |
|
Hardness, Rockwell c |
31.0 |
31.0 |
|
Tensile strength at break |
621 MPa |
90000 psi |
|
Yield strength (@strain 0.200 %) |
448 MPa |
65000 psi |
Applications of UNS S31803 Duplex Bars
1. Oil & Gas Industry
Offshore platforms, subsea pipelines, downhole equipment
Resists seawater corrosion, sour gas (H₂S), and high-pressure conditions
2. Chemical & Petrochemical Processing
Pressure vessels, reactors, heat exchangers, storage tanks
Handles acids, chlorides, and aggressive chemical media
3. Power Generation
Desalination plants, condenser tubes, flue gas scrubbers
Withstands high temperatures and corrosive cooling waters
4. Marine & Shipbuilding
Propeller shafts, seawater valves, ballast systems
Superior saltwater corrosion resistance
5. Pulp & Paper Industry
Bleaching equipment, digesters, pulp processing machinery
Resists caustic and acidic processing environments
6. Pharmaceutical & Food Processing
High-purity tubing, reactors, hygienic equipment
Non-reactive, easy to clean, and durable
Why Choose Lork Group for Duplex S31803 Bars?
- High-Quality Manufacturing – Strict ISO-compliant quality control
- Competitive Pricing – Cost-effective without compromising performance
- Custom Sizes & Grades – Available in round bars, rods, and machined components
- Global Export Expertise – Reliable logistics and on-time delivery
Contact us today for quotes, technical support, and customized solutions!
Lork Group – Your Trusted Partner for Premium Duplex Stainless Steel Solutions!
Surface Treatment
Manufacturing Process
Main Applications
Packaging & Shipping
FAQS
If you have any other questions, please contact me!
Q: Can you produce nickel alloy bars?
A: Yes, we can produce nickel alloy bars according to your requirements.
Q: What is your minimum order quantity?
A: Our minimum order quantity is 50 kg. Larger quantity, lower price.
Q: How long is your delivery time?
A: Generally delivery time for stock is 3 days, and customization takes 15 working days or more, but it is also affected by your specific requirements or order quantity.
Q: Can you provide samples?
A: For small parts, we can provide free sample of regular sizes, but the shipping costs will be borne by you. For large parts sample, we will include it in the order amount. Please confirm with our sales department for your specific requirements.
Q: How can l quickly get the price list?
A: Directly send us email with detailed specification, and you will get the official price list in 1 hour.
Q: How do you control product quality?
A: From the selection of raw materials to transportation packaging, every production process will be testing and evaluated. Only products that have passed all tests can be delivered for export.
Q: Can you provide processing services?
A: Yes, we also provide processing services to our customers. It is one of our goals to provide specialized services such as bending, water cutting, laser cutting, digging holes, welding, slitting of coils, and other fabrications according to the drawings.
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