Duplex Flanges exporter in USA
Duplex Flanges exporter in USA offers high-quality, corrosion-resistant pipe fittings designed to meet the rigorous demands of various industrial sectors. Manufactured from duplex stainless steel, these flanges provide an excellent balance of strength and resistance to chloride stress corrosion cracking, making them ideal for harsh environments. The product range typically includes slip-on, weld neck, blind, and threaded flanges, catering to diverse piping system requirements across multiple industries.
Constructed from duplex stainless steel grades such as UNS S31803 and S32205, these flanges exhibit superior mechanical properties, including high tensile strength and enhanced toughness. Their duplex microstructure combines austenitic and ferritic phases, resulting in better performance under extreme temperature and pressure conditions. This makes them suitable for applications in chemical processing, oil and gas, marine, and power generation sectors where durability and reliability are critical.
These industrial fittings are engineered to comply with international standards such as ASME, ASTM, and ANSI, ensuring compatibility and safety in global markets. Dimensions and pressure ratings are available according to ANSI B16.5 and B16.47 specifications, facilitating seamless integration into existing pipeline systems. Additionally, surface finishes like raised face, ring joint, and flat face are offered to meet specific sealing requirements.
With a focus on export readiness, products are carefully packaged and certified to meet customs and shipping regulations for seamless delivery worldwide. The supplier’s logistics capabilities ensure timely dispatch and tracking, supporting global supply chains efficiently. Quality assurance protocols, including material traceability and third-party inspection reports, further guarantee the product’s integrity upon arrival at the destination.
Industrial buyers seeking robust and reliable duplex steel flanges benefit from a comprehensive selection tailored for demanding operational environments. These flanges not only extend the lifespan of piping systems but also contribute to cost savings by minimizing maintenance and downtime. Partnering with a reputable exporter in the USA ensures access to premium products backed by technical support and after-sales service, vital for sustaining 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 USA 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 USA
- 2. How to Choose the Right Manufacturer
- 3.Comparison of Duplex Flanges exporter in USA
- 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 USA
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 USA
| 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
- ✔ Excellent corrosion resistance
- ✔ Superior weldability and formability
- ✔ Designed for high-pressure applications
- ✔ Versatile for various industries, including oil and gas
- ✔ Available in various sizes and specifications
Technical Overview of Duplex Flanges
| Product | Composition | Usage | Standards |
|---|---|---|---|
| Duplex 2205 Flanges | 22% Cr, 5% Ni, 3% Mo | Used in oil and gas, chemical processing, and marine applications | ASTM A182, ASME SA182 |
| Duplex 2507 Flanges | 25% Cr, 7% Ni, 4% Mo | Suitable for high chloride environments such as seawater applications | ASTM A240, ASME SA240 |
| Duplex 31803 Flanges | 22% Cr, 5% Ni, 3% Mo | Commonly used in pulp and paper, power generation, and waste treatment | ASTM A790, ASME SA790 |
Specifications Table
| Material | Duplex Stainless Steel |
|---|---|
| Grades | S32205, S31803 |
| Standard | ASTM A182, ASME SA-182 |
| Size Range | 1/2" to 24" |
| Length | Customizable |
| Form | Flat, Raised Face, Ring Type Joint |
Available Grades Table
| Product | Composition | Applications |
|---|---|---|
| Duplex 2205 Flanges | 22% Cr, 5% Ni, 3% Mo | Oil and gas, chemical processing, marine applications |
| Duplex 2507 Flanges | 25% Cr, 7% Ni, 4% Mo | Seawater applications, high chloride environments |
| Duplex 31803 Flanges | 22% Cr, 5% Ni, 3% Mo | Heat exchangers, pressure vessels |
| Duplex 32750 Flanges | 25% Cr, 7% Ni, 4% Mo | Pulp and paper, oil and gas |
| Duplex 2207 Flanges | 27% Cr, 7% Ni, 4% Mo | Desalination plants, petrochemical industries |
Available Sizes of Duplex Flanges (MM)
| Size (MM) | Size (MM) |
|---|---|
| 20 | 150 |
| 25 | 160 |
| 32 | 180 |
| 40 | 200 |
| 50 | 250 |
| 65 | 300 |
| 80 | 350 |
| 100 | 400 |
| 150 | 450 |
| 200 | 500 |
Chemical Properties of Duplex Stainless Steel Flanges
| Element | Composition (%) |
|---|---|
| Chromium (Cr) | 22.0 - 25.0 |
| Nickel (Ni) | 4.5 - 8.0 |
| Molybdenum (Mo) | 3.0 - 5.0 |
| Tungsten (W) | 0.5 - 1.5 |
| Carbon (C) | ≤ 0.03 |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 |
| Phosphorus (P) | ≤ 0.03 |
Mechanical Properties of Duplex Stainless Steel Flanges
| Property | Value |
|---|---|
| Tensile Strength (MPa) | 620-800 |
| Yield Strength (MPa) | 450-600 |
| Elongation (%) | 25-40 |
| Hardness (HB) | 220-290 |
| Impact Toughness (J at -40°C) | ≥ 40 |
Duplex Stainless Steel – Physical & Thermal Properties
Density of Duplex Stainless Steel
| Property | Metric | Imperial |
|---|---|---|
| Density | 7,800 kg/m³ | 0.283 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 - 300 | Annealed |
| 400 | 300 - 600 | Annealed |
Electrical Resistivity of Duplex Steel Flanges
| Electrical Resistivity | ||
|---|---|---|
| Value (µΩ·m) | Temperature (°C) | Treatment or Condition |
| 0.70 | 20 | As-rolled |
| 0.75 | 100 | |
| 0.80 | 300 | |
| 0.85 | 500 | |
| 0.90 | 700 | |
Equivalent of Duplex Flanges
| Standard | Werkstoff Nr. | UNS |
|---|---|---|
| ASTM A790 | 1.4462 | S32205 |
| EN 10088-3 | X2CrNiMoN22-5-3 | S31803 |
Manufacturing Process & Heat Treatment of Duplex Flanges
Annealing
Annealing of duplex flanges is performed to relieve internal stresses and improve ductility. The process involves heating the material to a temperature range of 1000°C to 1100°C, followed by a slow cooling process. This treatment enhances the microstructure, promoting a balanced phase distribution of austenite and ferrite, which is essential for the desired mechanical properties.
Forging
The forging process for duplex flanges includes hot working the steel at elevated temperatures, typically between 1100°C and 1250°C. This method improves the strength and toughness of the material by refining the grain structure. The forged flanges are then machined to meet specific dimensional tolerances and surface finish requirements.
Hardening & Tempering
| Process | Temperature Range (°C) | Quenching Medium | Purpose |
|---|---|---|---|
| Hardening | 1020 - 1100 | Oil or Water | To increase hardness and strength by transforming the microstructure. |
| Tempering | 400 - 800 | Air | To reduce brittleness and achieve desired toughness. |
| Stress Relieving | 600 - 700 | Air | To relieve residual stresses from previous processes. |
The combination of these manufacturing processes and heat treatments ensures that duplex flanges meet the rigorous demands of various industrial applications while maintaining excellent corrosion resistance and mechanical properties.
Various Types
Duplex Stainless Steel Blind Flange
- Dimensions: 1" to 48"
- Condition: Standard and Customized
- Applications: Oil & Gas, Petrochemical, Marine
Duplex Stainless Steel Weld Neck Flange
- Dimensions: 2" to 36"
- Condition: Hot Finished
- Applications: Chemical Processing, Power Generation
Duplex Stainless Steel Socket Weld Flange
- Dimensions: ½" to 4"
- Condition: Pickled and Passivated
- Applications: Piping Systems, Water Treatment
Duplex Stainless Steel Raised Face Flange
- Dimensions: 1" to 24"
- Condition: As Forged
- Applications: HVAC, Food Processing
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 | $5.50 – $6.00 | ₹450 – ₹490 |
| Duplex 2205 | 6 mm | $5.00 – $5.50 | ₹410 – ₹450 |
| Duplex 2205 | 10 mm | $4.80 – $5.20 | ₹400 – ₹430 |
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 in USA
- Stainless Steel Flanges Exporters in USA
- Nickel Alloy Flanges Manufacturers in USA
- Carbon Steel Flanges Distributors in USA
- Pipe Flanges Exporters in North America
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