Duplex Flanges exporter
Duplex Flanges exporter plays a critical role in supplying high-quality flanges made from duplex stainless steel, known for its exceptional corrosion resistance and mechanical strength. These flanges are manufactured using a blend of austenitic and ferritic stainless steel, typically grades like UNS S31803 or S32205, ensuring superior performance in harsh industrial environments. The product range includes weld neck, slip-on, blind, and threaded flanges, catering to diverse piping system requirements across various sectors.
Designed to withstand aggressive media and high pressure, these flanges exhibit excellent resistance to chloride stress corrosion cracking and pitting, making them ideal for chemical processing, oil and gas, marine, and desalination plants. The duplex material also offers enhanced tensile strength, which provides durability and longevity in demanding applications. Exported flanges undergo stringent quality checks and adhere to international standards such as ASTM A182 and ASME B16.5, ensuring reliability and consistency worldwide.
Precision manufacturing techniques, including CNC machining and advanced heat treatment processes, guarantee dimensional accuracy and optimal mechanical properties. The flanges are available in various pressure classes, sizes, and finishes, allowing customization to meet specific project needs. Surface treatments like pickling and passivation further enhance corrosion resistance and prepare the products for immediate integration into global supply chains.
With a focus on export readiness, suppliers maintain comprehensive documentation, including material test reports, certificates of compliance, and packing lists, facilitating smooth customs clearance and timely delivery. Efficient logistics and packaging solutions protect the flanges during transit, ensuring they arrive in pristine condition at international destinations. Buyers can expect seamless procurement processes backed by robust after-sales support and technical assistance.
Lead Time
2–7 weeks depending on size
Delivery Terms
FOB, CIF, DDP
Shipping Modes
Sea / Air / Express
Why Duplex Flanges exporter 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 exporter
- 2. How to Choose the Right Manufacturer
- 3.Comparison of Duplex Flanges exporter
- 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 exporter
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 exporter
| 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 resistance to corrosion in harsh environments
- ✔ Excellent mechanical properties at elevated temperatures
- ✔ Enhanced strength-to-weight ratio compared to traditional materials
- ✔ Versatile applications across various industries including oil & gas
- ✔ Cost-effective solution due to reduced maintenance needs
- ✔ Compliance with international standards for quality and safety
Technical Overview of Duplex Flanges
| Product | Composition | Usage | Standards |
|---|---|---|---|
| Duplex Stainless Steel Flanges | 22% Chromium, 5% Nickel, 3% Molybdenum | Oil and Gas Industry, Chemical Processing | AISI 2205, ASTM A182, ASME SA182 |
| Duplex Stainless Steel Blind Flanges | 25% Chromium, 7% Nickel, 4% Molybdenum | Marine Applications, Pulp and Paper Industry | AISI 2507, ASTM A240, ASME SA240 |
| Duplex Stainless Steel Socket Weld Flanges | 21% Chromium, 6% Nickel, 3% Molybdenum | Power Generation, Water Treatment | AISI 2205, ASTM A182, ASME SA182 |
Specifications Table
| Material | Duplex Stainless Steel |
|---|---|
| Grades | S31803, S32205, S32750 |
| Standard | ASTM A240, ASME SA240 |
| Size Range | 1/2" to 48" |
| Length | Customized lengths available |
| Form | Flanges (Slip-on, Weld Neck, Blind, etc.) |
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, offshore oil and gas, pulp and paper |
| Super Duplex 2507 | 25% Cr, 7% Ni, 4% Mo, 0.3% N | Seawater applications, chemical storage tanks |
| Duplex 904L | 20% Cr, 25% Ni, 4.5% Mo, 0.18% C | Acidic environments, pharmaceutical industry |
| Duplex S31803 | 22% Cr, 5% Ni, 3% Mo, 0.17% N | Petrochemical, wastewater treatment |
Available Sizes of Duplex Flanges (MM)
| Size (MM) | Size (MM) |
|---|---|
| 10 | 150 |
| 15 | 200 |
| 20 | 250 |
| 25 | 300 |
| 32 | 350 |
| 40 | 400 |
| 50 | 450 |
| 65 | 500 |
| 80 | 600 |
| 100 | 800 |
Chemical Properties of Duplex Stainless Steel
| Element | Composition (%) |
|---|---|
| Iron (Fe) | 64.0 - 70.0 |
| Chromium (Cr) | 18.0 - 28.0 |
| Nickel (Ni) | 4.5 - 8.0 |
| Molybdenum (Mo) | 3.0 - 5.0 |
| Manganese (Mn) | 0.5 - 2.0 |
| Silicon (Si) | 0.5 - 1.0 |
| Carbon (C) | 0.03 max |
| Phosphorus (P) | 0.03 max |
Mechanical Properties of Duplex Flanges
| Property | Value |
|---|---|
| Tensile Strength | 620 MPa |
| Yield Strength | 450 MPa |
| Elongation | 25% |
| Hardness | 220 HB |
| Impact Toughness | 40 J at -40°C |
Duplex Flanges – Physical & Thermal Properties
Density of Duplex Flanges
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.8 g/cm³ | 0.281 lb/in³ |
Melting Point of Duplex Flanges
| Property | Metric | Imperial |
|---|---|---|
| Melting Point | 1400 - 1460 °C | 2552 - 2660 °F |
Specific Heat of Duplex Flanges
| Specific Heat of Duplex Flanges | ||
|---|---|---|
| Specific Heat (J/kg·K) | Temperature Range (°C) | Condition |
| 500 | 20 - 100 | Room Temperature |
| 600 | 100 - 400 | Heating |
| 700 | 400 - 1000 | High Temperature |
Electrical Resistivity of Duplex Flanges
| Electrical Resistivity | ||
|---|---|---|
| Value (µΩ·m) | Temperature (°C) | Treatment or Condition |
| 70 | 20 | As-rolled |
| 75 | 100 | |
| 80 | 200 | |
| 85 | 300 | |
| 90 | 400 | |
Equivalent of Duplex Flanges
| Standard | Werkstoff Nr. | UNS |
|---|---|---|
| ASTM A240 | 1.4462 | S31803 |
| EN 10088-3 | X2CrNiMoN22-5-3 | S32205 |
Manufacturing Process & Heat Treatment of Duplex Flanges
Annealing
Annealing of duplex flanges involves heating the material to a temperature range of 1000-1100°C, followed by a controlled cooling process. This treatment helps to relieve internal stresses, improve ductility, and enhance the overall mechanical properties of the flanges.
Forging
Forging is a critical process in the manufacturing of duplex flanges, typically carried out at temperatures between 1000-1200°C. This process involves shaping the metal using compressive forces, which refines the grain structure, increases strength, and improves the toughness of the final product.
Hardening & Tempering
| Process | Temperature Range (°C) | Quenching Medium | Purpose |
|---|---|---|---|
| Hardening | 1050-1150 | Oil or water | To increase hardness and strength |
| Tempering | 600-800 | Air | To reduce brittleness and enhance toughness |
| Stress Relieving | 500-700 | Air | To alleviate residual stresses from the manufacturing process |
The careful execution of these manufacturing and heat treatment processes ensures that duplex flanges meet the high standards required for industrial applications, providing durability and reliability under various operating conditions.
Various Types
Duplex Stainless Steel Flanges
- Dimensions: 1" to 24"
- Condition: ASTM A182, A240
- Applications: Oil & Gas, Chemical Processing
Duplex Blind Flanges
- Dimensions: 1" to 30"
- Condition: ASTM A182, A240
- Applications: Pressure Vessels, Piping Systems
Duplex Weld Neck Flanges
- Dimensions: 1" to 36"
- Condition: ASTM A182, A240
- Applications: High-Pressure Applications, Marine Engineering
Duplex Socket Weld Flanges
- Dimensions: 1/2" to 4"
- Condition: ASTM A182, A240
- Applications: Piping Systems, Fuel Systems
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 2205 | 3 mm | $4.50 – $5.00 | ₹375 – ₹420 |
| Duplex 2205 | 6 mm | $4.30 – $4.80 | ₹360 – ₹400 |
| Duplex 2205 | 10 mm | $4.10 – $4.60 | ₹340 – ₹380 |
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
- Duplex Steel Flanges Suppliers
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- Duplex Steel Fasteners Exporter
- Duplex Steel Plate Suppliers
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