Duplex Round Bar
Duplex Round Bar is a high-performance alloy known for its exceptional strength and corrosion resistance. Typically manufactured from duplex stainless steel, this product combines austenitic and ferritic microstructures to deliver superior mechanical properties and enhanced durability. The bars are precision-rolled into cylindrical shapes, making them ideal for machining and fabrication in demanding industrial environments.
These bars are available in a range of diameters and lengths, adhering to stringent international standards such as ASTM A182 and EN 10088. Their chemical composition usually includes a balanced mix of chromium, nickel, and molybdenum, which contributes to excellent resistance against chloride-induced corrosion and stress corrosion cracking. This makes them particularly suitable for applications requiring longevity and reliability under harsh conditions.
Commonly utilized in sectors such as oil and gas, chemical processing, marine engineering, and power generation, these bars are integral components in the manufacturing of fasteners, shafts, valves, and structural parts. Their robust nature ensures performance stability even in environments exposed to aggressive chemicals, high temperatures, and mechanical stress.
For international buyers, these products are export-ready with certifications like ISO 9001 and material test reports (MTR) to verify quality and compliance. Suppliers often provide customized packaging and timely logistics solutions to meet global shipping requirements, ensuring the bars arrive in optimal condition for immediate use in production lines or maintenance operations.
Lead Time
2–7 weeks depending on size
Delivery Terms
FOB, CIF, DDP
Shipping Modes
Sea / Air / Express
Why Duplex Round Bar Are Preferred by Global Buyers
- ✔ Factory Pricing: Direct manufacturer rates with bulk stock
- ✔ Certified Quality: ISO & 3rd-party tested, EN 10204 certified
- ✔ Export-Ready: Sea-worthy packaging for on-time delivery
- ✔ Fast RFQs: Quick quotes for custom sizes & quantities
- ✔ Traceability: 100% heat number tracking from raw material to finished product
Trusted by industries like oil & gas, petrochemicals, power, marine, and heavy engineering.
- Manufacturing Capacity: 500 MT / Month
- Export Experience: 15+ Years
- Countries Served: 50+
- Annual Export Volume: 5,500 MT
Table of Contents
- 1. What is Duplex Round Bar
- 2. How to Choose the Right Manufacturer
- 3.Comparison of Duplex Round Bar
- 4. Why Global Buyers Source from Ragnar Metals and Tubes
- 5. Features
- 6. Technical Overview
- 7. Specifications
- 8. Available Grades
- 9. Available Sizes
- 10. Chemical Properties
- 11. Mechanical Properties
- 12. Physical & Thermal Properties
- 13. Electrical Resistivity
- 14. Equivalent Grades
- 15. Manufacturing Process & Heat Treatment
- 16. Various Types
- 17. Applications & Uses
- 18. Industries We Serve
- 19. Latest Price List
- 20. MOQ & Payment Terms
- 21. Export Packaging & Shipping
- 22. Cities We Supply in India
- 23. Countries We Export Worldwide
- 24. Our Certifications
- 25. Quality Inspection & Testing
- 26. Our Other Product Types
- 27. People Also Search For
- 28. Frequently Asked Questions
- 29. About Ragnar Metals and Tubes
How to Choose the Right Duplex Round Bar
India is home to hundreds of manufacturers ranging from small job shops to large ISO-certified exporters. International and domestic buyers typically evaluate manufacturers based on quality compliance, production capacity, export experience, and pricing transparency.
- Certification & international standards (ASME, ASTM, EN)
- Manufacturing capability vs trading activity
- Export documentation & inspection support
- Stock availability & lead time reliability
- Past supply experience in oil & gas, EPC & heavy industries
Comparison Factors Among Duplex Round Bar
| Evaluation Factor | Small Local Suppliers | Trading Companies | ISO-Certified Manufacturers |
|---|---|---|---|
| Manufacturing Control | Limited | None | Full in-house / audited partners |
| International Standards | Basic | Depends on source | ASME / ASTM / EN |
| Inspection & MTCs | Limited | Inconsistent | EN 10204 3.1 / 3.2 |
| Export Experience | Low | Medium | 50+ countries |
| Risk for EPC Projects | High | Medium | Low |
International buyers typically prefer ISO-certified manufacturers for large-scale or critical applications due to better quality control, documentation, and lower project risk.
Why Global Buyers Choose Ragnar Metals and Tubes
Ragnar Metals and Tubes is a trusted ISO 9001:2015 certified manufacturer and global exporter of ferro alloys and metal products, supplying consistent, high-quality materials to customers across USA, UK, Europe, Middle East, Africa, and Asia-Pacific. Our focus on quality assurance, cost efficiency, and on-time delivery makes us a preferred sourcing partner for international buyers.
| Key Advantage | Buyer Benefit |
|---|---|
| ISO 9001:2015 Certified Manufacturing | Consistent quality with documented QA systems and process control |
| ASME / ASTM / EN Compliant Products | Globally accepted standards with EN 10204 3.1 / 3.2 MTCs |
| Lower Manufacturing & Sourcing Costs | Save up to 15–20% compared to European suppliers |
| Favorable Exchange Rate Advantage | Reduced landed cost for international importers |
| In-House Testing & Inspection Facilities | Strict chemical, mechanical & dimensional quality checks |
| Bulk Stock & High Production Capacity | Fast order fulfillment and stable supply for large projects |
| Custom Sizes & Drawing-Based Manufacturing | Products manufactured exactly to buyer specifications |
| Export-Grade Packaging & Global Logistics | Sea-worthy packing, palletization & worldwide shipping support |
| Faster Global Shipping Routes | Optimized logistics for Middle East, Africa & Southeast Asia |
| Technical & After-Sales Support | Project assistance, documentation & responsive RFQ handling |
| Trusted by Global Steel & EPC Companies | Proven export experience across 50+ countries |
Features of Duplex Round Bar
- ✔ High Strength and Durability
- ✔ Excellent Corrosion Resistance
- ✔ Good Weldability and Fabricability
- ✔ High Thermal Conductivity
- ✔ Resistance to Stress Corrosion Cracking
- ✔ Cost-Effective Solution for Various Applications
Technical Overview of Duplex Round Bar
| Product | Composition | Usage | Standards |
|---|---|---|---|
| Duplex Round Bar | 22% Chromium, 5% Nickel, 3% Molybdenum, Balance Iron | Marine applications, Chemical processing, Oil and gas industry | ASTM A276, ASTM A790 |
| Duplex Round Bar | 23% Chromium, 4.5% Nickel, 3% Molybdenum, Balance Iron | Structural components, Heat exchangers, Pressure vessels | ASTM A240, EN 10088 |
| Duplex Round Bar | 24% Chromium, 6% Nickel, 2% Molybdenum, Balance Iron | Pharmaceutical industry, Pulp and paper production, Waste treatment | ISO 15156, ASTM A479 |
Specifications Table
| Material | Duplex Stainless Steel |
|---|---|
| Grades | 2205, 2507 |
| Standard | ASTM A276, ASTM A789 |
| Size Range | 10 mm to 100 mm diameter |
| Length | 3 meters to 6 meters |
| Form | Round Bar |
Available Grades Table
| Product | Composition | Applications |
|---|---|---|
| Duplex 2205 | 22% Cr, 5% Ni, 3% Mo | Oil and gas, chemical processing, marine applications |
| Duplex 2507 | 25% Cr, 7% Ni, 4% Mo | Desalination plants, oil and gas production, petrochemical environments |
| Duplex 2448 | 24% Cr, 4% Ni, 3% Mo | Structural applications, offshore platforms, pulp and paper |
| Super Duplex 2507 | 25% Cr, 7% Ni, 4% Mo, 0.2% N | High chloride environments, chemical processing, marine applications |
| Duplex 32750 | 25% Cr, 6% Ni, 4% Mo, 0.2% N | High-strength applications, oil and gas, pulp and paper |
Available Sizes of Duplex Round Bar (MM)
| Size (MM) | Size (MM) |
|---|---|
| 10 | 12 |
| 14 | 16 |
| 18 | 20 |
| 22 | 25 |
| 28 | 30 |
| 32 | 35 |
| 40 | 45 |
| 50 | 55 |
| 60 | 65 |
| 70 | 75 |
Chemical Properties of Duplex Round Bar
| Element | Composition (%) |
|---|---|
| Iron (Fe) | 60.0 - 70.0 |
| Chromium (Cr) | 18.0 - 28.0 |
| Nickel (Ni) | 4.5 - 8.0 |
| Molybdenum (Mo) | 2.5 - 5.0 |
| Manganese (Mn) | 2.0 |
| Silicon (Si) | 0.5 |
| Carbon (C) | 0.03 - 0.08 |
| Phosphorus (P) | 0.03 |
Mechanical Properties of Duplex Round Bar
| Property | Value |
|---|---|
| Tensile Strength | 620 - 850 MPa |
| Yield Strength | 450 - 600 MPa |
| Elongation | 25 - 40% |
| Hardness | 220 - 300 HB |
| Impact Toughness | ≥ 40 J at -40°C |
Duplex Round Bar – Physical & Thermal Properties
Density of Duplex Round Bar
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.8 g/cm³ | 0.281 lb/in³ |
Melting Point of Duplex Round Bar
| Property | Metric | Imperial |
|---|---|---|
| Melting Point | 1425 - 1550 °C | 2600 - 2820 °F |
Specific Heat of Duplex Round Bar
| Specific Heat of Duplex Round Bar | ||
|---|---|---|
| Specific Heat (J/kg·K) | Temperature Range (°C) | Condition |
| 500 | 20 - 100 | Room Temperature |
| 540 | 100 - 400 | Heating |
| 600 | 400 - 800 | High Temperature |
Electrical Resistivity of Duplex Round Bar
| Electrical Resistivity | ||
|---|---|---|
| Value (µΩ·m) | Temperature (°C) | Treatment or Condition |
| 0.73 | 20 | As-rolled |
| 0.76 | 100 | |
| 0.80 | 200 | |
| 0.85 | 300 | |
| 0.90 | 400 | |
Equivalent of Duplex Round Bar
| Standard | Werkstoff Nr. | UNS |
|---|---|---|
| ASTM A240 | 1.4462 | S32205 |
| EN 10088-3 | X2CrNiMoN22-5-3 | S31803 |
Manufacturing Process & Heat Treatment of Duplex Round Bar
Annealing
The annealing process for duplex round bars involves heating the material to a temperature range of 1000°C to 1100°C, followed by a controlled cooling process. This treatment helps to relieve internal stresses, improve ductility, and refine the microstructure, ensuring optimal performance in various applications.
Forging
Forging of duplex round bars is performed at elevated temperatures, typically between 950°C and 1200°C. This process enhances the mechanical properties by refining the grain structure and increasing the strength of the material. The bars are shaped using hydraulic presses or hammers, allowing for precise control over dimensions and properties.
Hardening & Tempering
| Process | Temperature Range (°C) | Quenching Medium | Purpose |
|---|---|---|---|
| Hardening | 1050 - 1150 | Oil | Increase hardness and strength |
| Tempering | 600 - 800 | Air | Reduce brittleness and improve toughness |
| Stress Relieving | 500 - 600 | Air | Eliminate residual stresses |
The combination of these processes results in duplex round bars that exhibit excellent mechanical properties, corrosion resistance, and durability, making them suitable for a wide range of industrial applications.
Various Types
Duplex Round Bar S31803
- Diameter: 12mm to 300mm
- Condition: Hot Rolled, Cold Drawn
- Applications: Oil & Gas, Marine, Chemical Processing
Duplex Round Bar S32205
- Diameter: 10mm to 250mm
- Condition: Annealed, Pickled
- Applications: Construction, Pressure Vessels, Heat Exchangers
Duplex Round Bar S32750
- Diameter: 15mm to 200mm
- Condition: Cold Drawn, Hot Finished
- Applications: Pulp & Paper, Desalination, Marine Environment
Duplex Round Bar S32760
- Diameter: 20mm to 150mm
- Condition: Solution Annealed
- Applications: Oil & Gas, Chemical Processing, Marine
Applications & Uses
- Oil & Gas Industry: Pipelines, process piping, and high-pressure fluid handling systems.
- Petrochemical & Refineries: Reactors, heat exchangers, and chemical processing units.
- Water Treatment Plants: Filtration systems, storage tanks, and corrosion-resistant piping.
- Pharmaceutical Industry: Hygienic piping, sanitary fittings, and cleanroom equipment.
- Food & Beverage: Processing lines, storage vessels, and contamination-free pipelines.
- Automobile & Engineering: Exhaust systems, structural parts, and precision components.
- Power & Energy Sector: Boilers, condensers, and turbine piping systems.
- Marine & Offshore: Shipbuilding, offshore platforms, and coastal infrastructure.
- Construction & Infrastructure: Structural frameworks, bridges, and industrial buildings.
Industries We Serve
Our stainless steel, alloy steel, and high-performance metal products are widely used across the following industries:
Latest Price List of Duplex Round Bar
| Material Grade | Thickness | Price (USD / Kg) | Price (INR / Kg) |
|---|---|---|---|
| Duplex Round Bar | 3 mm | $2.50 – $3.00 | ₹207 – ₹248 |
| Duplex Round Bar | 6 mm | $2.40 – $2.90 | ₹199 – ₹241 |
| Duplex Round Bar | 10 mm | $2.30 – $2.80 | ₹192 – ₹233 |
Note: Prices are indicative and may vary based on size, quantity, raw material cost, and delivery location. Contact us for the latest quotation for Duplex Round Bar.
MOQ & Payment Terms
Minimum Order Quantity: 25–100 Kg depending on part size and grade.
Payment Terms: Depending On Grade and Quantity Size
Export Packaging & Shipping
- Seaworthy, fumigated wooden crates with waterproof inner lining
- Palletised packing with clear shipping marks and heat number identification
- Container stuffing supervision with loading photographs available on request
We Exported to 50+ Countries Worldwide
| Global Export Destinations | |||||
|---|---|---|---|---|---|
| United States | Canada | Mexico | United Kingdom | Germany | Netherlands |
| Italy | Spain | South Africa | Australia | India | Korea |
| United Arab Emirates | Saudi Arabia | Qatar | Kuwait | Oman | Bahrain |
| Singapore | Malaysia | Indonesia | Dubai | Riyadh | Dammam |
Our Certifications
We are a certified manufacturer and exporter, committed to strict quality control and international compliance standards. Below are our key certifications.
GST Registered
ISO 9001:2015
ISO 1002:2018
Udyam MSME Registration
Testing Process & Quality Assurance – Ragnar Metals & Tubes
At Ragnar Metals & Tubes, our testing process ensures the safety, reliability, and performance of stainless steel and alloy steel products supplied for global industrial and infrastructure projects. Each batch is verified from raw material selection to final dispatch under internationally recognized standards including ASTM, ASME, ISO, DIN, and EN.
Detects internal flaws using high-frequency sound waves
Measures yield strength, elongation, and material durability
Evaluates toughness under low-temperature and high-stress conditions
Ensures smoothness, coating quality, and visual compliance
Enhances hardness, strength, and corrosion resistance
Measures resistance to deformation and wear
Documentation & Global Compliance
- ✔ EN 10204 3.1 / 3.2 Mill Test Certificates (MTC)
- ✔ Batch-wise quality traceability and inspection records
- ✔ Third-party inspection by SGS, TUV, Bureau Veritas & Lloyd’s
- ✔ Export documentation support for customs and international shipping
Supporting supply for oil & gas, petrochemical, power generation, marine, infrastructure, and heavy engineering industries worldwide.
Related Products
Explore our full range of stainless steel and alloy steel products including pipes, tubes, fittings, flanges, sheets, plates, spools, fasteners, round bars, and special grades manufactured for industrial, infrastructure, and global export applications.
People Also Search For
- Duplex Steel Properties
- Stainless Steel Round Bar
- Duplex Bar Applications
- Super Duplex Round Bar
- Duplex Steel Grades
Frequently Asked Questions
About Ragnar Metals & Tubes
- ✔ Leading manufacturer, stockist, and exporter of stainless steel and alloy steel products for industrial and infrastructure projects
- ✔ ISO 9001:2015 certified quality management system ensuring consistent product reliability and compliance
- ✔ Specialized in precision pipes, tubes, fittings, flanges, sheets, plates, fasteners, and round bars
- ✔ Modern processing and testing facilities with advanced manufacturing and inspection equipment
- ✔ Custom-engineered solutions based on client drawings and technical specifications
- ✔ Full material traceability with EN 10204 3.1 / 3.2 mill test certification
- ✔ Compliance with ASTM, ASME, DIN, EN, and ISO international standards
- ✔ Trusted global supplier supporting oil & gas, petrochemical, power, marine, and heavy engineering industries