Duplex Flanges exporter in Qatar
Duplex Flanges exporter in Qatar offers high-quality, corrosion-resistant flanges designed for demanding industrial environments. Manufactured from duplex stainless steel, these flanges combine the strength of ferritic and austenitic stainless steels, providing excellent resistance to stress corrosion cracking and pitting. Ideal for use in oil and gas, petrochemical, and marine industries, they ensure durability and reliability in harsh conditions.
These flanges are available in various types, including weld neck, slip-on, blind, and threaded, catering to different piping system requirements. With precise dimensional accuracy conforming to international standards such as ASME, ASTM, and DIN, the products guarantee seamless integration with existing pipelines. The duplex composition typically ranges between 22-25% chromium and 4-6% nickel, with the addition of molybdenum to enhance corrosion resistance, making them suitable for aggressive media and high-pressure applications.
Applications for these flanges span across critical sectors where strength and longevity are paramount. They are widely used in chemical processing plants, seawater desalination systems, and offshore platforms, where exposure to chloride-rich environments demands superior material performance. Their ability to withstand extreme temperatures and mechanical stress makes them indispensable for maintaining system integrity and safety.
Export readiness is a key consideration, with suppliers ensuring that all duplex flanges undergo rigorous quality control and testing before shipment. This includes non-destructive testing methods such as radiographic and ultrasonic inspections to detect any material flaws. Additionally, packaging is designed to prevent damage during transit, and compliance with international shipping regulations ensures timely delivery to global industrial buyers.
For industrial purchasers in Qatar and beyond, sourcing from a reliable exporter means access to duplex stainless steel flanges that meet stringent performance criteria and regulatory standards. This facilitates the construction and maintenance of robust piping networks essential for efficient and safe industrial operations.
Lead Time
2–7 weeks depending on size
Delivery Terms
FOB, CIF, DDP
Shipping Modes
Sea / Air / Express
Why Duplex Flanges exporter in Qatar 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 in Qatar
- 2. How to Choose the Right Manufacturer
- 3.Comparison of Duplex Flanges exporter in Qatar
- 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 in Qatar
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 in Qatar
| 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 corrosion resistance in aggressive environments
- ✔ Excellent strength-to-weight ratio for reduced material usage
- ✔ Versatile applications in oil and gas, chemical, and marine industries
- ✔ Enhanced durability and longevity compared to standard stainless steel
- ✔ Superior weldability for ease of installation
- ✔ Available in various sizes and pressure ratings to meet specific requirements
Technical Overview of Duplex Flanges
| Product | Composition | Usage | Standards |
|---|---|---|---|
| Duplex Stainless Steel Flanges | 22% Chromium, 5% Nickel, 3% Molybdenum | Used in high-pressure and high-temperature applications | ASTM A182, ASTM A240 |
| Duplex 2205 Flanges | 22% Chromium, 5% Nickel, 3% Molybdenum, 0.18% Nitrogen | Ideal for oil and gas, chemical processing | ASME B16.5, NACE MR0175 |
| Duplex 2507 Flanges | 25% Chromium, 7% Nickel, 4% Molybdenum | Suitable for seawater applications and desalination plants | ASTM A240, ASTM A182 |
Specifications Table
| Material | Duplex Stainless Steel |
|---|---|
| Grades | 2205, 2507 |
| Standard | ASTM A182, ASME SA182 |
| 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 | Offshore environments, pulp and paper, desalination plants |
| Super Duplex 2507 | Fe, 25% Cr, 7% Ni, 4.5% Mo, 0.3% N | High chloride environments, petrochemical industries |
| Duplex 31803 | Fe, 22% Cr, 5% Ni, 3% Mo, 0.2% N | Power generation, water treatment, pharmaceutical |
| Duplex 32750 | Fe, 25% Cr, 7% Ni, 4% Mo, 0.2% N | Seawater applications, chemical storage |
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 (%) |
|---|---|
| Carbon (C) | 0.03 max |
| Manganese (Mn) | 2.00 max |
| Silicon (Si) | 1.00 max |
| Chromium (Cr) | 18.00 - 28.00 |
| Nickel (Ni) | 4.50 - 8.00 |
| Molybdenum (Mo) | 3.00 - 5.00 |
| Nitrogen (N) | 0.08 - 0.20 |
| Iron (Fe) | Balance |
Mechanical Properties of Duplex Stainless Steel
| Property | Value |
|---|---|
| Tensile Strength (MPa) | 620 - 850 |
| Yield Strength (MPa) | 450 - 600 |
| Elongation (%) | 25 - 35 |
| Hardness (HB) | 250 - 300 |
| Impact Strength (J at -40°C) | ≥ 40 |
Duplex Stainless Steel – Physical & Thermal Properties
Density of Duplex Stainless Steel
| Property | Metric | Imperial |
|---|---|---|
| Density | 7,800 kg/m³ | 0.282 lb/in³ |
Melting Point of Duplex Stainless Steel
| Property | Metric | Imperial |
|---|---|---|
| Melting Point | 1,300 - 1,400 °C | 2,372 - 2,552 °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 |
| 460 | 100 - 400 | Annealed |
| 400 | 400 - 800 | Annealed |
Electrical Resistivity of Duplex Stainless Steel
| Electrical Resistivity | ||
|---|---|---|
| Value (µΩ·m) | Temperature (°C) | Treatment or Condition |
| 0.73 | 20 | As-Welded |
| 0.75 | 100 | |
| 0.77 | 200 | |
| 0.80 | 300 | |
| 0.82 | 400 | |
Equivalent of Duplex Flanges
| Standard | Werkstoff Nr. | UNS |
|---|---|---|
| ASTM A240 | 1.4462 | S32205 |
| ASTM A182 | 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 flanges are heated to a temperature range of 1000-1100°C and held for a specified duration before cooling slowly in air. This process ensures uniform microstructure and improved mechanical properties.
Forging
Forging is a critical step in the manufacturing of duplex flanges, where heated billets are shaped into flanges using hydraulic presses or hammers. The forging process enhances the strength and toughness of the material by refining the grain structure, resulting in superior performance in high-pressure applications.
Hardening & Tempering
| Process | Temperature Range (°C) | Quenching Medium | Purpose |
|---|---|---|---|
| Hardening | 1020-1100 | Oil | To increase hardness and strength of the material. |
| Tempering | 600-800 | Air | To reduce brittleness and improve toughness after hardening. |
| Stress Relieving | 300-500 | Air | To relieve residual stresses from the forging and machining processes. |
The careful execution of these processes ensures that duplex flanges meet the stringent requirements of various industrial applications, providing reliability and performance in challenging environments.
Various Types
Duplex Stainless Steel Flanges
- Sizes: 1/2" to 48"
- Condition: Hot Rolled, Cold Drawn
- Applications: Oil & Gas, Chemical Processing, Marine
Duplex Blind Flanges
- Sizes: 1" to 36"
- Condition: Forged, Machined
- Applications: Water Treatment, Pulp and Paper
Duplex Slip-On Flanges
- Sizes: 3/4" to 24"
- Condition: ASTM A182, A240
- Applications: Construction, Shipbuilding
Duplex Weld Neck Flanges
- Sizes: 1" to 30"
- Condition: Seamless, Welded
- Applications: Petrochemical, Pharmaceutical
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 | $5.00 – $5.50 | ₹410 – ₹450 |
| Duplex Flanges | 6 mm | $5.20 – $5.70 | ₹430 – ₹470 |
| Duplex Flanges | 10 mm | $5.50 – $6.00 | ₹450 – ₹490 |
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