Duplex Flanges manufacturer
Duplex Flanges manufacturer plays a critical role in supplying high-performance components essential for piping systems across various industries. These flanges are typically crafted from duplex stainless steel, a material known for its exceptional strength and corrosion resistance, combining the benefits of both austenitic and ferritic stainless steels. This unique composition makes them ideal for handling aggressive environments, such as those found in chemical processing, oil and gas, and marine applications.
Produced in a range of types including weld neck, slip-on, blind, and threaded flanges, these products meet stringent international standards like ASTM A182 and ASME B16.5. Duplex stainless steel grades such as 2205 and 2507 ensure durability and longevity under high pressure and temperature conditions. The precision manufacturing process guarantees dimensional accuracy and surface finish, which are crucial for maintaining leak-proof connections in critical systems.
Industries relying on these components benefit from their superior mechanical properties, including high tensile strength and excellent resistance to stress corrosion cracking. Their application extends to pipelines, pressure vessels, heat exchangers, and offshore platforms. The flanges’ reliability contributes significantly to operational safety and efficiency, reducing downtime and maintenance costs.
Export readiness is a key consideration, with manufacturers adhering to international quality certifications and providing comprehensive documentation such as mill test reports and third-party inspection certificates. Packaging is designed to protect the flanges during transit, ensuring they reach global clients in optimal condition. This focus on quality and compliance makes these products suitable for global markets, including Europe, North America, and Asia-Pacific regions.
Partnering with a reputable supplier ensures access to customized solutions tailored to specific project requirements. From standard dimensions to custom-engineered pieces, the flexibility in design and prompt delivery schedules support the dynamic needs of industrial buyers worldwide. Investing in these robust flanges enhances the integrity and performance of critical infrastructure, underscoring their value in demanding industrial applications.
Lead Time
2–7 weeks depending on size
Delivery Terms
FOB, CIF, DDP
Shipping Modes
Sea / Air / Express
Why Duplex Flanges manufacturer 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 Flanges manufacturer
- 2. How to Choose the Right Manufacturer
- 3.Comparison of Duplex Flanges manufacturer
- 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 Flanges manufacturer
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 Flanges manufacturer
| 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 Flanges
- ✔ High strength-to-weight ratio for efficient performance
- ✔ Excellent corrosion resistance in harsh environments
- ✔ Enhanced weldability for streamlined installation
- ✔ Ability to withstand high temperatures and pressures
- ✔ Cost-effective alternative to traditional materials
- ✔ Wide range of sizes and specifications available
Technical Overview of Duplex Flanges
| Product | Composition | Usage | Standards |
|---|---|---|---|
| Duplex Steel Flanges | 22% Chromium, 5% Nickel, 3% Molybdenum | Used in high-pressure and high-temperature applications in oil and gas, chemical, and marine industries. | ASTM A790, ASME SA790, ASTM A479 |
| Super Duplex Steel Flanges | 25% Chromium, 7% Nickel, 4% Molybdenum | Ideal for seawater applications, pulp and paper processing, and chemical processing. | ASTM A928, ASME SA928 |
| Duplex Stainless Steel Flanges | 22% Chromium, 5% Nickel, Balanced Ferritic/Austenitic | Commonly used in oil refineries, power plants, and waste treatment facilities. | EN 10204, EN 10088-3 |
Specifications Table
| Material | Duplex Stainless Steel |
|---|---|
| Grades | S31803, S32205 |
| Standard | ASTM A182, ASME B16.5 |
| Size Range | 1/2" to 24" |
| Length | Custom lengths available |
| Form | Blind, Slip-on, Weld Neck, Threaded |
Available Grades Table
| Product | Composition | Applications |
|---|---|---|
| Duplex 2205 | Fe, 22% Cr, 5% Ni, 3% Mo | Oil and gas, chemical processing, marine applications |
| Duplex 2507 | Fe, 25% Cr, 7% Ni, 4% Mo | Seawater applications, offshore oil and gas, chemical processing |
| Super Duplex 2507 | Fe, 25% Cr, 7% Ni, 4% Mo, 0.3% N | High chloride environments, pulp and paper, desalination plants |
| Duplex 31803 | Fe, 22% Cr, 5% Ni, 3% Mo, 0.17% N | Oil and gas, chemical processing, pressure vessels |
| Duplex 32750 | Fe, 25% Cr, 6% Ni, 4% Mo, 0.27% N | Corrosive environments, chemical industry, pulp and paper |
Available Sizes of Duplex Flanges (MM)
| Size (MM) | Size (MM) |
|---|---|
| 15 | 20 |
| 25 | 32 |
| 40 | 50 |
| 65 | 80 |
| 100 | 125 |
| 150 | 200 |
| 250 | 300 |
| 350 | 400 |
| 450 | 500 |
| 600 | 800 |
Chemical Properties of Duplex Stainless Steel
| Element | Composition (%) |
|---|---|
| Iron (Fe) | 62.0 - 70.0 |
| Chromium (Cr) | 18.0 - 28.0 |
| Nickel (Ni) | 4.5 - 8.0 |
| Molybdenum (Mo) | 2.5 - 4.0 |
| Manganese (Mn) | 0.5 - 2.0 |
| Silicon (Si) | 0.5 - 1.0 |
| Sulfur (S) | ≤ 0.02 |
| Carbon (C) | ≤ 0.03 |
Mechanical Properties of Duplex Stainless Steel
| Property | Value |
|---|---|
| Tensile Strength (MPa) | 620 - 800 |
| Yield Strength (MPa) | 450 - 600 |
| Elongation (%) | 25 - 40 |
| Hardness (HB) | 250 - 350 |
| Impact Toughness (J @ -40°C) | ≥ 40 |
Duplex Stainless Steel – Physical & Thermal Properties
Density of Duplex Stainless Steel
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.8 g/cm³ | 0.282 lb/in³ |
Melting Point of Duplex Stainless Steel
| Property | Metric | Imperial |
|---|---|---|
| Melting Point | 1350 - 1450 °C | 2462 - 2642 °F |
Specific Heat of Duplex Stainless Steel
| Specific Heat of Duplex Stainless Steel | ||
|---|---|---|
| Specific Heat (J/kg·K) | Temperature Range (°C) | Condition |
| 500 | 20 - 100 | Annealed |
| 540 | 100 - 300 | Annealed |
| 600 | 300 - 600 | Annealed |
Electrical Resistivity of Duplex Flanges
| Electrical Resistivity | ||
|---|---|---|
| Value (µΩ·m) | Temperature (°C) | Treatment or Condition |
| 0.72 | 20 | Annealed |
| 0.75 | 100 | |
| 0.78 | 200 | |
| 0.82 | 300 | |
| 0.85 | 400 | |
Equivalent of Duplex Flanges
| Standard | Werkstoff Nr. | UNS |
|---|---|---|
| EN 10088-3 | 1.4462 | S32205 |
| ASTM A240 | 1.4462 | S32205 |
Manufacturing Process & Heat Treatment of Duplex Flanges
Annealing
Annealing of duplex flanges is performed to relieve internal stresses and enhance ductility. The process involves heating the flanges to a specific temperature range of 1020°C to 1100°C, followed by a slow cooling process. This treatment ensures a uniform microstructure, which is crucial for the performance of the flanges in demanding environments.
Forging
Forging of duplex flanges is executed to improve mechanical properties and refine the grain structure. The process involves heating the steel to approximately 1200°C and then shaping it using hydraulic presses or hammers. This method enhances the strength and toughness of the flanges, making them suitable for high-pressure applications.
Hardening & Tempering
| Process | Temperature Range (°C) | Quenching Medium | Purpose |
|---|---|---|---|
| Hardening | 1000 - 1100 | Oil | To increase hardness and strength |
| Tempering | 600 - 800 | Air | To reduce brittleness and improve toughness |
| Final Annealing | 1020 - 1100 | Air | To achieve desired microstructure and relieve stresses |
The comprehensive manufacturing and heat treatment processes employed in the production of duplex flanges ensure that they meet stringent industry standards for quality and performance, making them ideal for use in various applications, including oil and gas, chemical processing, and marine environments.
Various Types
Duplex 2205 Flange
- Dimensions: 1" to 24" nominal pipe size
- Condition: Hot Rolled, Pickled and Oiled
- Applications: Oil & Gas, Chemical Processing, Marine
Duplex 2507 Flange
- Dimensions: 1" to 30" nominal pipe size
- Condition: Cold Worked, Anodized
- Applications: Desalination, Pulp & Paper, Wastewater Treatment
Duplex 31803 Flange
- Dimensions: 1" to 12" nominal pipe size
- Condition: Forged, Heat Treated
- Applications: Power Generation, Petrochemical, Marine Environments
Duplex 32750 Flange
- Dimensions: 2" to 16" nominal pipe size
- Condition: Hot Rolled, Passivated
- Applications: Chemical Processing, Oil & Gas, Offshore Platforms
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 Flanges
| Material Grade | Thickness | Price (USD / Kg) | Price (INR / Kg) |
|---|---|---|---|
| Duplex Flanges | 3 mm | $5.50 – $6.00 | ₹460 – ₹500 |
| Duplex Flanges | 6 mm | $5.80 – $6.30 | ₹480 – ₹520 |
| Duplex Flanges | 10 mm | $6.00 – $6.50 | ₹500 – ₹540 |
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 Flanges.
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
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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