Duplex Spool exporter
Duplex Spool exporter plays a crucial role in supplying high-quality piping assemblies fabricated from duplex stainless steel, known for its excellent corrosion resistance and superior mechanical properties. These spools are precision-engineered components used extensively in industries requiring robust and reliable pipeline solutions, such as oil and gas, chemical processing, and marine applications. Manufactured under stringent quality controls, the duplex spools ensure durability and performance in harsh environments.
The material used in these assemblies is primarily duplex stainless steel, which combines the benefits of austenitic and ferritic stainless steels. This results in enhanced strength, resistance to stress corrosion cracking, and improved weldability. Typically, grades like 2205 and 2507 are preferred for their balanced microstructure and ability to withstand chloride-induced corrosion, making them ideal for offshore and aggressive chemical environments.
Precision fabrication involves cutting, welding, and assembling pipe sections with flanges, fittings, and valves according to client specifications and international standards such as ASME, ASTM, and ISO. The spools are designed to fit seamlessly into existing pipeline networks, ensuring minimal downtime during installation. Dimensional accuracy and surface finish are maintained to meet project-specific requirements, supporting seamless integration in complex industrial setups.
Applications for these duplex stainless steel spools span across multiple sectors where resistance to corrosion and mechanical stress is paramount. They are extensively used in subsea pipelines, refineries, petrochemical plants, and desalination facilities. The ability to withstand extreme temperatures and pressures while maintaining structural integrity makes these assemblies indispensable for critical infrastructure projects worldwide.
Export readiness is ensured through comprehensive testing, certification, and packaging processes tailored to protect the spools during transit. Exporters typically provide documentation such as mill test reports, third-party inspection certificates, and material traceability records to meet international procurement standards. With strategic logistics planning and compliance with global trade regulations, these spools are efficiently delivered to industrial buyers across various geographies, supporting global infrastructure development.
Lead Time
2–7 weeks depending on size
Delivery Terms
FOB, CIF, DDP
Shipping Modes
Sea / Air / Express
Why Duplex Spool 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 Spool exporter
- 2. How to Choose the Right Manufacturer
- 3.Comparison of Duplex Spool 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 Spool 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 Spool 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 Spool
- ✔ High corrosion resistance, ideal for harsh environments
- ✔ Excellent mechanical strength and toughness
- ✔ Superior weldability for easy fabrication
- ✔ Cost-effective solution for various industries
- ✔ Wide range of sizes and dimensions available
- ✔ Conforms to international standards for quality and safety
Technical Overview of Duplex Spool Exporter
| Product | Composition | Usage | Standards |
|---|---|---|---|
| Duplex Stainless Steel Spool | 25% Chromium, 5% Nickel, 3.5% Molybdenum | Used in oil and gas pipelines to resist corrosion and high pressures | ASTM A790, ASTM A923 |
| Duplex Pipe Fittings | 22% Chromium, 5% Nickel, 3% Molybdenum | Connecting sections of piping in various industrial applications | ASME B16.9, ASME B16.28 |
| Duplex Flanges | 25% Chromium, 7% Nickel, 4% Molybdenum | Sealing joints in high-pressure systems | ANSI/ASME B16.5, API 605 |
Specifications Table
| Material | Duplex Stainless Steel |
|---|---|
| Grades | 2205, 2507 |
| Standard | ASTM A790, ASTM A928 |
| Size Range | 1/2" to 24" (NPS) |
| Length | Custom lengths up to 40 feet |
| Form | Spool |
Available Grades Table
| Product | Composition | Applications |
|---|---|---|
| Duplex 2205 | 22% Cr, 5% Ni, 3% Mo | Oil and gas, chemical processing |
| Duplex 2507 | 25% Cr, 7% Ni, 4% Mo | Marine environments, petrochemical applications |
| Duplex 2304 | 23% Cr, 4% Ni | Wastewater treatment, food processing |
| Duplex 2016 | 21% Cr, 6% Ni, 3% Mo | Power generation, pulp and paper industry |
| Super Duplex 2507 | 25% Cr, 7% Ni, 4% Mo, 0.2% N | High chloride environments, offshore applications |
Available Sizes of Duplex Spool (MM)
| Size (MM) | Size (MM) |
|---|---|
| 50 | 100 |
| 75 | 150 |
| 100 | 200 |
| 125 | 250 |
| 150 | 300 |
| 200 | 350 |
| 250 | 400 |
| 300 | 450 |
| 350 | 500 |
| 400 | 600 |
Chemical Properties of Duplex Stainless Steel
| Element | Composition (%) |
|---|---|
| Chromium (Cr) | 22.0 - 25.0 |
| Nickel (Ni) | 4.5 - 8.0 |
| Molybdenum (Mo) | 3.0 - 5.0 |
| Manganese (Mn) | 1.0 - 2.0 |
| Silicon (Si) | 0.5 - 1.0 |
| Carbon (C) | 0.03 max |
| Sulfur (S) | 0.01 max |
| Iron (Fe) | Balance |
Mechanical Properties of Duplex Stainless Steel
| Property | Value |
|---|---|
| Tensile Strength (MPa) | 620 - 800 |
| Yield Strength (MPa) | 450 - 600 |
| Elongation (%) | 25 - 40 |
| Hardness (HB) | 200 - 300 |
| Impact Toughness (J at -40°C) | ≥ 40 |
Duplex Spool – Physical & Thermal Properties
Density of Duplex Spool
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.8 g/cm³ | 0.28 lb/in³ |
Melting Point of Duplex Spool
| Property | Metric | Imperial |
|---|---|---|
| Melting Point | 1390 - 1450 °C | 2534 - 2642 °F |
Specific Heat of Duplex Spool
| Specific Heat of Duplex Spool | ||
|---|---|---|
| Specific Heat (J/kg·K) | Temperature Range (°C) | Condition |
| 500 | 20 - 100 | Liquid |
| 460 | 100 - 600 | Gas |
| 400 | 600 - 1000 | Solid |
Electrical Resistivity of Duplex Spool
| Electrical Resistivity | ||
|---|---|---|
| Value (µΩ·m) | Temperature (°C) | Treatment or Condition |
| 0.70 | 20 | Annealed |
| 0.72 | 100 | |
| 0.75 | 200 | |
| 0.78 | 300 | |
| 0.80 | 400 | |
Equivalent of Duplex Spool exporter
| Standard | Werkstoff Nr. | UNS |
|---|---|---|
| ASTM A790 | 1.4462 | S32205 |
| EN 10088-3 | X2CrNiMoN22-5-3 | S31803 |
Manufacturing Process & Heat Treatment of Duplex Spool
Annealing
The annealing process for duplex spools involves heating the material to a temperature between 1020°C and 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 steel, ensuring a balanced microstructure of ferrite and austenite phases.
Forging
Forging of duplex spools is performed at temperatures ranging from 1000°C to 1200°C. This process involves shaping the material through compressive forces, which improves its strength and structural integrity. The forging process helps to refine the grain structure and ensures uniform properties throughout the component.
Hardening & Tempering
| Process | Temperature Range (°C) | Quenching Medium | Purpose |
|---|---|---|---|
| Hardening | 1050 - 1150 | Oil | Increase hardness and strength of the material |
| Tempering | 600 - 700 | Air | Reduce brittleness while maintaining hardness |
| Stress Relieving | 500 - 600 | Air | Eliminate residual stresses from the manufacturing process |
The combination of these processes ensures that duplex spools exhibit optimal performance in various industrial applications, providing a balance of strength, ductility, and corrosion resistance.
Various Types
Duplex Stainless Steel Spool
- Diameter: 2" to 12"
- Condition: As Welded
- Applications: Oil & Gas, Chemical Processing
Duplex Steel Spool with Flanges
- Diameter: 4" to 10"
- Condition: Pickled and Passivated
- Applications: Marine, Pulp and Paper
High Pressure Duplex Spool
- Diameter: 3" to 8"
- Condition: Heat Treated
- Applications: Power Generation, Water Treatment
Duplex Super Spool
- Diameter: 6" to 16"
- Condition: Cold Drawn
- Applications: Pharmaceutical, 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 Spool
| Material Grade | Thickness | Price (USD / Kg) | Price (INR / Kg) |
|---|---|---|---|
| Duplex Spool | 3 mm | $2.50 – $3.00 | ₹207 – ₹248 |
| Duplex Spool | 6 mm | $2.40 – $2.90 | ₹199 – ₹241 |
| Duplex Spool | 10 mm | $2.30 – $2.80 | ₹192 – ₹232 |
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 Spool.
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 Pipe Supplier
- Duplex Stainless Steel Fittings
- Duplex Flanges Manufacturer
- Duplex Steel Plate Exporter
- Duplex Steel Bar Distributor
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