Duplex Flanges exporter in Qatar
Duplex Flanges exporter in Qatar specializes in supplying high-grade stainless steel components conforming to ASTM A182 and EN 10222 standards. These flanges are manufactured using duplex stainless steel grades like 2205 and 2507, ensuring superior corrosion resistance and mechanical strength.
Applications typically include oil and gas, petrochemical, and marine industries where durability and resistance to chloride stress corrosion cracking are critical. The products undergo rigorous non-destructive testing (NDT) such as ultrasonic and dye penetrant inspections to guarantee quality.
Export procedures adhere to international packaging norms, utilizing corrosion-inhibitive wraps and sturdy wooden crates to maintain product integrity during transit. Logistics coordination ensures timely delivery aligned with global shipping schedules and customs regulations.
Clients benefit from detailed documentation including mill test reports (MTRs), certificates of compliance, and traceability records. This comprehensive approach supports seamless integration into project supply chains and regulatory compliance worldwide.
Global Delivery & Export Assurance
Trusted by EPC contractors, OEMs, and industrial buyers in 40+ countries
β± Fast Lead Time
2β7 weeks depending on size & specification
Expedited production available on requestπ¦ Flexible Delivery Terms
FOB, CIF, CFR, DDP (Incoterms 2020)
Door-to-port and door-to-door optionsβοΈ Global Shipping
Sea Freight / Air Cargo / Express Courier
Export documentation & tracking includedRequest Export Pricing for Duplex Flanges exporter in Qatar
Trusted by EPC contractors, procurement teams, and global industrial buyers across 50+ countries for certified supply and on-time delivery.
Manufacturer Pricing
Factory-direct rates with bulk stock availability to reduce your total landed cost.
International Certifications
ISO, EN 10204 3.1, SGS & TPI approved with mill test certificates on every shipment.
Export-Ready Packaging
Sea-worthy, container-ready packaging for safe international transit and on-time delivery.
Table of Contents
- 1. What is Duplex Flanges exporter in Qatar
- 2. Why Choose Ragnar Pipe and Tube
- 3. Export Delivery & Lead Time Information
- 4. How to Choose the Right Manufacturer
- 5. Comparison of Duplex Flanges exporter in Qatar
- 6. Why Global Buyers Source from Ragnar Metal and Tube
- 7. Features
- 8. Technical Overview
- 9. Specifications
- 10. Available Grades
- 11. Available Sizes
- 12. Chemical Properties
- 13. Mechanical Properties
- 14. Physical & Thermal Properties
- 15. Electrical Resistivity
- 16. Equivalent Grades
- 17. Manufacturing Process & Heat Treatment
- 18. Various Types
- 19. Applications & Uses
- 20. Industries We Serve
- 21. Latest Price List
- 22. MOQ & Payment Terms
- 23. Export Packaging & Shipping
- 24. Cities We Supply in India
- 25. Countries We Export Worldwide
- 26. Our Certifications
- 27. Quality Inspection & Testing
- 28. Our Other Product Types
- 29. People Also Search For
- 30. Frequently Asked Questions
- 31. About Ragnar Metal and Tube
How to Choose the Right Supplier for Duplex Flanges exporter in Qatar
Choosing the right supplier for Duplex Flanges exporter in Qatar plays a critical role in ensuring product quality, project safety, and long-term cost efficiency. With a wide range of manufacturers, stockists, and exporters operating across India, buyers must look beyond pricing and focus on reliability, certifications, and export readiness.
At Ragnar Metals & Tubes, we support global EPC contractors, procurement managers, and industrial buyers by delivering fully certified, traceable, and export-compliant metal products that meet international standards and country-specific import regulations.
- International standards compliance β ASTM, ASME, EN, ISO, and EN 10204 3.1 material test certification
- Verified manufacturing and sourcing β Direct mill supply, in-house processing, and strict quality inspections
- Inspection and export documentation β SGS, TPI, BV, and customs-ready paperwork for smooth international clearance
- Stock availability and delivery timelines β Reliable lead times for urgent, bulk, and project-based requirements
- Global project experience β Proven supply for oil & gas, EPC, petrochemical, power generation, and heavy engineering industries
Comparison Guide for Duplex Flanges exporter in Qatar
Understand the key differences between local suppliers, trading firms, and ISO-certified manufacturers to make informed sourcing decisions for international and domestic projects.
| Evaluation Factor | Small Local Suppliers | Trading Companies | ISO-Certified Manufacturers |
|---|---|---|---|
| Manufacturing Control | Limited in-house processing | Dependent on third-party mills | Full in-house production or audited partner facilities |
| International Standards | Basic or regional compliance | Varies by sourcing mill | ASTM, ASME, EN, ISO certified materials |
| Inspection & Certification | Limited documentation | Inconsistent MTC availability | EN 10204 3.1 / 3.2, SGS, TPI, BV support |
| Export & Logistics Experience | Low or domestic-only | Moderate international handling | Established exports to 50+ countries |
| Project Risk Level | High | Medium | Low |
For critical applications in oil & gas, EPC, power generation, marine, and infrastructure projects, buyers typically prioritize ISO-certified manufacturers to ensure compliance, traceability, and long-term performance.
Why Global Buyers Partner with Ragnar Metals & Tubes
Ragnar Metals & Tubes is a globally trusted manufacturer, stockist, and exporter of stainless steel, duplex steel, alloy steel, and high-performance piping solutions supporting EPC contractors, industrial plants, and infrastructure projects across the Middle East, Europe, Africa, Southeast Asia, and the Americas . Our strength lies in technical expertise, certified quality systems, and export-focused supply chains designed for long-term project reliability.
| Ragnar Advantage | How It Benefits You |
|---|---|
| ISO-Certified Quality Management Systems | Documented inspection, traceability, and process controls ensure consistent material performance and compliance. |
| ASTM, ASME & EN Standard Compliance | Internationally approved specifications with EN 10204 3.1 / 3.2 mill test certificates for project and regulatory acceptance. |
| Strategic Stockholding & Production Partnerships | Faster lead times and stable supply for shutdowns, expansions, and large-scale EPC requirements. |
| Global Export & Documentation Expertise | Complete handling of COO, HS codes, packing lists, invoices, and third-party inspections for smooth customs clearance. |
| In-House & Third-Party Quality Verification | Chemical, mechanical, and dimensional testing supported by SGS, TPI, BV, and client-nominated agencies. |
| Custom Manufacturing & Project-Based Supply | Drawing-based production, special lengths, and grade substitutions engineered to match site and design requirements. |
| Export-Grade Packaging & Container Planning | Sea-worthy packing, fumigated pallets, and optimized container loading to minimize transit damage and logistics costs. |
| Multi-Industry Project Experience | Proven supply for oil & gas, power generation, marine, petrochemical, water treatment, and heavy engineering sectors. |
| Responsive RFQ & Technical Support Team | Fast quotations, material selection guidance, and documentation support throughout the procurement lifecycle. |
| Established Global Supply Network | Reliable exports to 50+ countries with repeat buyers and long-term project partnerships. |
Key Features of Duplex Flanges
- β High resistance to corrosion and pitting
- β Excellent strength and durability under high pressure
- β Cost-effective solution for various industrial applications
- β Versatile design suitable for different piping systems
- β Superior weldability and formability
- β Compliance with international standards and certifications
Technical Overview of Duplex Flanges
| Product | Composition | Usage | Standards |
|---|---|---|---|
| Duplex Flanges | UNS S32205 (22% Cr, 5% Ni, 3% Mo) | Used in oil and gas applications for high strength and corrosion resistance | ASTM A182, ASTM A240 |
| Duplex Flanges | UNS S31803 (22% Cr, 5% Ni) | Utilized in chemical processing due to excellent resistance to pitting | EN 10204, ASTM A479 |
| Duplex Flanges | UNS S32750 (25% Cr, 7% Ni, 4% Mo) | Ideal for marine applications where high strength and corrosion resistance are critical | ASTM A240, ASTM A182 |
Specifications Table
| Material | Duplex Stainless Steel |
|---|---|
| Grades | S31803, S32205 |
| Standard | ASTM A182, ASME B16.5 |
| Size Range | 1/2" to 24" |
| Length | Customizable up to 12 meters |
| Form | Blind, Slip-on, Weld neck, Socket weld |
Available Grades Table
| Product | Composition | Applications |
|---|---|---|
| Duplex Pipes | UNS S31803 (22% Cr, 5% Ni, 3% Mo) | Oil and gas industry, chemical processing |
| Duplex Tubes | UNS S32750 (25% Cr, 7% Ni, 4% Mo) | Marine applications, desalination plants |
| Duplex Fittings | UNS S32205 (22% Cr, 5% Ni, 3% Mo) | Pipelines, pressure vessels |
| Duplex Bars | UNS S31803 (22% Cr, 5% Ni, 3% Mo) | Structural components, fasteners |
| Duplex Plates | UNS S32760 (25% Cr, 7% Ni, 4% Mo) | Fabrication of storage tanks, pressure vessels |
Available Sizes of Duplex Flanges (MM)
| Size (MM) | Size (MM) |
|---|---|
| 15 | 50 |
| 20 | 65 |
| 25 | 80 |
| 32 | 100 |
| 40 | 125 |
| 50 | 150 |
| 65 | 200 |
| 80 | 250 |
| 100 | 300 |
| 150 | 400 |
Chemical Properties of Duplex Stainless Steel
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.03 max |
| Manganese (Mn) | 2.00 max |
| Silicon (Si) | 1.00 max |
| Phosphorus (P) | 0.03 max |
| Sulfur (S) | 0.01 max |
| Chromium (Cr) | 18.00 - 28.00 |
| Nickel (Ni) | 4.50 - 8.00 |
| Molybdenum (Mo) | 3.00 - 5.00 |
Mechanical Properties of Duplex Stainless Steel Flanges
| Property | Value |
|---|---|
| Tensile Strength | 620 - 800 MPa |
| Yield Strength | 450 - 600 MPa |
| Elongation | 25% (min) |
| Hardness | 250 - 300 HB |
| Impact Toughness | β₯ 40 J at -50Β°C |
Duplex Stainless Steel β Physical & Thermal Properties
Density of Duplex Stainless Steel
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.8 g/cmΒ³ | 0.28 lb/inΒ³ |
Melting Point of Duplex Stainless Steel
| Property | Metric | Imperial |
|---|---|---|
| Melting Point | 1400 - 1450 Β°C | 2552 - 2642 Β°F |
Specific Heat of Duplex Stainless Steel
| Specific Heat of Duplex Stainless Steel | ||
|---|---|---|
| Specific Heat (J/kgΒ·K) | Temperature Range (Β°C) | Condition |
| 500 | 20 - 400 | Room Temperature |
| 600 | 400 - 800 | High Temperature |
| 700 | 800 - 1000 | Very High Temperature |
Electrical Resistivity of Duplex Stainless Steel
| Electrical Resistivity | ||
|---|---|---|
| Value (¡Ω·m) | Temperature (°C) | Treatment or Condition |
| 0.72 | 20 | As-Received |
| 0.74 | 100 | |
| 0.76 | 200 | |
| 0.78 | 300 | |
| 0.80 | 400 | |
Equivalent of Duplex Flanges
| Standard | Werkstoff Nr. | UNS |
|---|---|---|
| ASTM A240 | 1.4462 | S32205 |
| ASME SA240 | 1.4462 | S32205 |
Manufacturing Process & Heat Treatment of Duplex Flanges
Annealing
Annealing of duplex flanges involves heating the material to a temperature range of 950Β°C to 1150Β°C, followed by a slow cooling process. This treatment helps to relieve internal stresses, improve ductility, and enhance the overall microstructure of the steel, ensuring better formability and machining properties.
Forging
The forging process for duplex flanges is conducted at high temperatures, typically between 1100Β°C and 1200Β°C. This method involves shaping the flanges through compressive forces, resulting in a refined grain structure that improves strength and toughness. The forged duplex flanges are then allowed to cool, preparing them for further processing.
Hardening & Tempering
| Process | Temperature Range (Β°C) | Quenching Medium | Purpose |
|---|---|---|---|
| Hardening | 1020 - 1100 | Oil or Water | Increase hardness and strength |
| Tempering | 600 - 800 | Air | Reduce brittleness and adjust hardness |
| Stress Relieving | 300 - 600 | Air | Eliminate residual stresses |
The combination of these manufacturing and heat treatment processes ensures that duplex flanges meet the stringent requirements for strength, durability, and corrosion resistance, making them suitable for various industrial applications.
Various Types
Duplex Stainless Steel Flanges
- Dimensions: 1" to 24"
- Condition: Hot Finished, Cold Finished
- Applications: Oil & Gas, Chemical Processing, Marine Engineering
Super Duplex Flanges
- Dimensions: 1" to 12"
- Condition: As Forged, Annealed
- Applications: High-Pressure Applications, Seawater Applications
Duplex Alloy Flanges
- Dimensions: Β½" to 16"
- Condition: Pickled, Passivated
- Applications: Pulp and Paper, Wastewater Treatment
Custom Duplex Flanges
- Dimensions: Custom Sizes Available
- Condition: Various Conditions Based on Client Requirements
- Applications: Tailored Solutions for Specific Industries
Applications & Uses of Stainless Steel and Alloy Products
- 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 | $4.50 β $5.00 | βΉ370 β βΉ410 |
| Duplex Flanges | 6 mm | $4.80 β $5.30 | βΉ390 β βΉ430 |
| Duplex Flanges | 10 mm | $5.10 β $5.60 | βΉ410 β βΉ450 |
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 for Metal Products
- Minimum Order Quantity (MOQ): Typically 25β100 Kg, depending on product type, dimensions, and material grade.
- Payment Terms: Flexible terms based on order volume, grade selection, and delivery location. Advance payment or mutually agreed commercial terms apply.
Steel Export Packaging & International Shipping Services from India
We provide professional steel export packaging and global shipping services from India, ensuring stainless steel and alloy steel products are securely packed, documented, and delivered to international ports including the Middle East, Europe, Africa, and Southeast Asia with full compliance to international trade and quality standards.
- Seaworthy Export Packing: Fumigated wooden crates with waterproof lining to protect steel products during ocean transit.
- Palletised & Marked Shipments: Heat number identification, batch labeling, and export documentation for traceability and customs clearance.
- Container Stuffing & Inspection: Supervised loading with photographs, weight checks, and final quality inspection before dispatch.
We Export Stainless Steel & Alloy Products 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 & Export Compliance Standards
We are a certified stainless steel and alloy steel manufacturer and global exporter from India, operating under internationally recognized quality, safety, and export compliance standards to ensure reliable supply for international buyers and industrial projects.
GST Registered Company β Government of India
ISO 9001:2015 β Quality Management System
ISO 1002:2018 - Quality Management System
Udyam Registration β MSME, Government of India
Testing Process & Quality Assurance β 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
- β EN 10204 3.1 / 3.2 Mill Test Certificates (MTC)
- β Batch-wise quality traceability and inspection records
- β Third-party inspection by SGS, TUV, Bureau Veritas & Lloydβs
- β 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 Pipe Suppliers in Qatar
- Stainless Steel Flanges Manufacturers in Qatar
- Nickel Alloy Flanges Exporters in Qatar
- Pipe Fittings Exporters in Qatar
- Metal Fabrication Services in Qatar
Frequently Asked Questions
About Ragnar Metals & Tubes
- β Leading manufacturer, stockist, and exporter of stainless steel and alloy steel products for industrial and infrastructure projects
- β ISO 9001:2015 certified quality management system ensuring consistent product reliability and compliance
- β Specialized in precision pipes, tubes, fittings, flanges, sheets, plates, fasteners, and round bars
- β Modern processing and testing facilities with advanced manufacturing and inspection equipment
- β Custom-engineered solutions based on client drawings and technical specifications
- β Full material traceability with EN 10204 3.1 / 3.2 mill test certification
- β Compliance with ASTM, ASME, DIN, EN, and ISO international standards
- β Trusted global supplier supporting oil & gas, petrochemical, power, marine, and heavy engineering industries