Duplex Spool manufacturer
Duplex Spool manufacturer plays a critical role in supplying high-quality piping components tailored for demanding industrial environments. These spools, typically fabricated from duplex stainless steel, combine the strength of ferritic steel with the corrosion resistance of austenitic grades, making them ideal for sectors such as oil and gas, petrochemical, and marine engineering. The material's dual-phase microstructure ensures enhanced durability, resistance to stress corrosion cracking, and excellent mechanical properties under high pressure and temperature conditions.
Manufactured as pre-assembled pipe sections with flanges, fittings, and sometimes valves, these duplex spools are designed to streamline installation processes and minimize onsite welding. Precision fabrication techniques including CNC machining, automated welding, and rigorous non-destructive testing ensure tight tolerances and compliance with international standards such as ASTM A815 and ASME B31.3. This meticulous approach guarantees reliable performance in critical pipeline systems where safety and longevity are paramount.
Industries that rely on these components benefit from their versatility in handling aggressive fluids, including chlorides and acidic substances, without compromising structural integrity. Their application ranges from subsea pipelines and chemical processing plants to power generation facilities, where resistance to pitting and crevice corrosion is essential. Additionally, the duplex alloy's superior strength-to-weight ratio allows for lighter, more cost-effective installations without sacrificing robustness.
Export readiness is a key consideration, with manufacturers offering comprehensive documentation packages including material test reports, heat treatment certificates, and third-party inspection certifications. Packaging solutions are optimized for international shipment, ensuring protection against environmental factors during transit. Compliance with global trade regulations and the ability to customize spool dimensions and configurations further enhance their suitability for worldwide industrial projects.
For industrial buyers seeking durable and efficient piping solutions, partnering with a reputable supplier of duplex stainless steel spools ensures access to components that meet stringent quality benchmarks and are engineered for long-term operational excellence. This strategic investment supports the integrity and sustainability of critical infrastructure across diverse industrial landscapes.
Lead Time
2–7 weeks depending on size
Delivery Terms
FOB, CIF, DDP
Shipping Modes
Sea / Air / Express
Why Duplex Spool manufacturer 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 manufacturer
- 2. How to Choose the Right Manufacturer
- 3.Comparison of Duplex Spool manufacturer
- 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 manufacturer
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 manufacturer
| 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 Spools
- ✔ High corrosion resistance for longevity in harsh environments
- ✔ Excellent strength-to-weight ratio, reducing overall system weight
- ✔ Superior thermal conductivity for efficient heat transfer
- ✔ Easy fabrication capabilities to meet custom specifications
- ✔ Compatibility with various welding techniques for versatile applications
- ✔ Cost-effective solution for both small and large scale projects
Technical Overview of Duplex Spool
| Product | Composition | Usage | Standards |
|---|---|---|---|
| Duplex Stainless Steel Spool | 22% Chromium, 5% Nickel, 3% Molybdenum | Used in oil and gas, chemical processing, and marine applications | ASTM A790, ASME SA790 |
| Duplex Stainless Steel Spool | 25% Chromium, 7% Nickel, 4% Molybdenum | Suitable for high-pressure and high-temperature environments | EN 10216-5, ISO 15156 |
| Duplex Stainless Steel Spool | 20% Chromium, 6% Nickel, 2% Molybdenum | Commonly used in pulp and paper, and wastewater treatment | API 5L, ASTM A928 |
Specifications Table
| Material | Duplex Stainless Steel |
|---|---|
| Grades | UNS S31803, UNS S32205 |
| Standard | ASTM A789/A790 |
| Size Range | 1/2" to 24" |
| Length | Up to 40 feet |
| Form | Spool |
Available Grades Table
| Product | Composition | Applications |
|---|---|---|
| Duplex 2205 | 22% Cr, 5% Ni, 3% Mo | Oil & Gas, Chemical Processing, Marine Applications |
| Duplex 2507 | 25% Cr, 7% Ni, 4% Mo | Desalination, Pulp & Paper, Offshore Oil & Gas |
| Duplex 2304 | 23% Cr, 4% Ni, 1.5% Mo | Food Processing, Wastewater Treatment, Architectural |
| Duplex 2011 | 21% Cr, 1.5% Ni, 0.1% Mo | Automotive, Aerospace, Pressure Vessels |
| Super Duplex 2507 | 25% Cr, 7% Ni, 4% Mo, 0.2% N | Marine Environments, Chemical Tanks, Heat Exchangers |
Available Sizes of Duplex Spool (MM)
| Size (MM) | Size (MM) |
|---|---|
| 50 | 100 |
| 75 | 125 |
| 80 | 150 |
| 90 | 200 |
| 100 | 250 |
| 150 | 300 |
| 200 | 350 |
| 250 | 400 |
| 300 | 450 |
| 350 | 500 |
Chemical Properties of Duplex Stainless Steel (e.g., UNS S32205)
| Element | Composition (%) |
|---|---|
| Chromium (Cr) | 22.0 - 23.0 |
| Nickel (Ni) | 4.5 - 6.5 |
| Molybdenum (Mo) | 3.0 - 5.0 |
| Manganese (Mn) | 0.5 - 1.5 |
| Silicon (Si) | 0.5 max |
| Carbon (C) | 0.03 max |
| Sulfur (S) | 0.01 max |
| Nitrogen (N) | 0.08 - 0.20 |
Mechanical Properties of Duplex Stainless Steel
| Property | Value |
|---|---|
| Tensile Strength (MPa) | 620 - 800 |
| Yield Strength (MPa) | 450 - 600 |
| Elongation (%) | 25 - 40 |
| Hardness (HB) | 250 - 300 |
| Impact Toughness (J) | 50 (min) at -40°C |
Duplex Stainless Steel – Physical & Thermal Properties
Density of Duplex Stainless Steel
| Property | Metric | Imperial |
|---|---|---|
| Density | 7,800 kg/m³ | 0.28 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 | Room Temperature |
| 520 | 100 - 500 | Heated Condition |
| 600 | 500 - 1,000 | High Temperature |
Electrical Resistivity of Duplex Stainless Steel
| Electrical Resistivity | ||
|---|---|---|
| Value (µΩ·m) | Temperature (°C) | Treatment or Condition |
| 0.72 | 20 | As-rolled |
| 0.75 | 100 | |
| 0.78 | 200 | |
| 0.80 | 300 | |
| 0.83 | 400 | |
Equivalent of Duplex Stainless Steel
| Standard | Werkstoff Nr. | UNS |
|---|---|---|
| ASTM A240 | 1.4462 | S32205 |
| EN 10088-3 | X2CrNiMoN22-5-3 | S31803 |
Manufacturing Process & Heat Treatment of Duplex Spool
Annealing
Annealing of duplex spools involves heating the material to a temperature range of 950-1100°C, followed by a slow cooling process. This treatment relieves internal stresses, enhances ductility, and improves the overall microstructure of the steel, making it more suitable for subsequent forming processes.
Forging
The forging process for duplex spools is conducted at temperatures between 1100-1300°C. This hot working process helps to refine the grain structure, increase strength, and improve toughness. The forged spools are then cooled to room temperature in a controlled manner to maintain their mechanical properties.
Hardening & Tempering
| Process | Temperature Range (°C) | Quenching Medium | Purpose |
|---|---|---|---|
| Hardening | 1000-1100 | Water or Oil | To increase hardness and strength |
| Tempering | 600-800 | Air | To reduce brittleness and improve toughness |
| Final Annealing | 750-850 | Air | To enhance ductility and relieve residual stresses |
The combination of these manufacturing and heat treatment processes ensures that duplex spools achieve optimal mechanical properties, making them suitable for a wide range of industrial applications.
Various Types
Duplex Stainless Steel Spool - Type 2205
- Dimensions: 2" to 12" diameter
- Condition: Annealed
- Applications: Oil & gas, chemical processing
Duplex Stainless Steel Spool - Type 2507
- Dimensions: 1" to 6" diameter
- Condition: Cold worked
- Applications: Marine environments, desalination plants
Duplex Stainless Steel Spool - Type 31803
- Dimensions: 0.5" to 4" diameter
- Condition: Hot rolled
- Applications: Pulp and paper, wastewater treatment
Duplex Stainless Steel Spool - Type 32750
- Dimensions: 3" to 10" diameter
- Condition: Pickled and passivated
- Applications: High chloride environments, petrochemical
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 Spools
| Material Grade | Thickness | Price (USD / Kg) | Price (INR / Kg) |
|---|---|---|---|
| Duplex 2205 | 3 mm | $3.50 – $4.00 | ₹290 – ₹320 |
| Duplex 2205 | 6 mm | $3.20 – $3.70 | ₹260 – ₹300 |
| Duplex 2205 | 10 mm | $3.00 – $3.50 | ₹240 – ₹290 |
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 Spools.
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