Duplex S31803 Spool manufacturer
Duplex S31803 Spool manufacturer specializes in producing high-quality piping spools fabricated from Duplex stainless steel grade S31803. This material is known for its excellent corrosion resistance, high strength, and superior durability, making it ideal for demanding industrial environments. The spools are precision-engineered components used to connect pipes and equipment in various fluid transport systems, ensuring reliable and leak-free operation.
The spools are fabricated according to stringent industry standards, incorporating precise welding techniques and thorough quality inspections. Duplex S31803 offers a balanced microstructure of austenite and ferrite phases, providing enhanced resistance to stress corrosion cracking and chloride-induced corrosion. This makes the product highly suitable for applications in oil and gas, chemical processing, desalination plants, and marine environments.
Manufactured components are available in various sizes and configurations to meet the specific requirements of complex piping networks. The mechanical properties of the duplex spools, including tensile strength and yield strength, are carefully controlled to comply with ASTM A182 or equivalent standards. Additionally, the material’s excellent weldability ensures compatibility with other stainless steel grades used in the system.
Export readiness is a key focus, with manufacturers ensuring all spools undergo rigorous testing such as hydrostatic pressure tests, radiographic inspections, and dimensional verifications. Documentation including material test reports (MTRs), certificates of compliance, and packing lists are meticulously prepared to facilitate smooth international shipping. This attention to detail supports global supply chain demands and ensures timely delivery to industrial buyers worldwide.
With a commitment to quality and precision, these duplex stainless steel spools provide industrial buyers with robust and efficient solutions for corrosive and high-pressure applications. Their versatility and reliability make them a preferred choice for engineers and procurement specialists seeking durable piping components that meet the challenges of harsh operational conditions.
Lead Time
2–7 weeks depending on size
Delivery Terms
FOB, CIF, DDP
Shipping Modes
Sea / Air / Express
Why Duplex S31803 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 S31803 Spool manufacturer
- 2. How to Choose the Right Manufacturer
- 3.Comparison of Duplex S31803 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 S31803 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 S31803 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 S31803 Spool
- ✔ Excellent corrosion resistance in a wide range of environments
- ✔ High strength and durability, suitable for demanding applications
- ✔ Good weldability and formability for complex designs
- ✔ Resistance to pitting and crevice corrosion
- ✔ Suitable for high-pressure and high-temperature applications
- ✔ Cost-effective solution for long-term performance
Technical Overview of Duplex S31803
| Product | Composition | Usage | Standards |
|---|---|---|---|
| Duplex S31803 Spool | 22% Cr, 5% Ni, 3.2% Mo, 0.17% N, balance Fe | Oil and gas pipelines, chemical processing | ASTM A790, ASME SA790 |
| Duplex S31803 Spool | 22% Cr, 5% Ni, 3.2% Mo, 0.17% N, balance Fe | Marine applications, pressure vessels | EN 10216-5, EN 10088-3 |
| Duplex S31803 Spool | 22% Cr, 5% Ni, 3.2% Mo, 0.17% N, balance Fe | Heat exchangers, storage tanks | API 5L, NACE MR0175 |
Specifications Table
| Material | Duplex S31803 |
|---|---|
| Grades | S31803, S32205 |
| Standard | ASTM A790 / A928 |
| Size Range | 1/2" to 24" (NPS) |
| Length | Custom lengths available up to 40 feet |
| Form | Spool |
Available Grades Table
| Product | Composition | Applications |
|---|---|---|
| Duplex S31803 | 22% Cr, 5% Ni, 3.2% Mo | Oil and gas, chemical processing, pulp and paper |
| Duplex S32205 | 22% Cr, 5.5% Ni, 3.2% Mo | Marine applications, pressure vessels, heat exchangers |
| Duplex S32750 | 25% Cr, 7% Ni, 4% Mo | Seawater applications, petrochemical industry |
| Duplex S32760 | 25% Cr, 7% Ni, 5% Mo | Aerospace, chemical transport |
| Duplex S31803N | 22% Cr, 5% Ni, 3.2% Mo, Nitrides | Extreme environments, offshore platforms |
Available Sizes of Duplex S31803 (MM)
| Size (MM) | Size (MM) |
|---|---|
| 50 | 100 |
| 60 | 110 |
| 70 | 120 |
| 80 | 130 |
| 90 | 140 |
| 100 | 150 |
| 120 | 160 |
| 140 | 180 |
| 160 | 200 |
| 180 | 220 |
Chemical Properties of Duplex S31803
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.03 max |
| Manganese (Mn) | 2.0 max |
| Phosphorus (P) | 0.03 max |
| Sulfur (S) | 0.02 max |
| Silicon (Si) | 1.0 max |
| Chromium (Cr) | 22.0 - 23.0 |
| Nickel (Ni) | 4.5 - 6.5 |
| Molybdenum (Mo) | 3.0 - 3.5 |
Mechanical Properties of Duplex S31803
| Property | Value |
|---|---|
| Tensile Strength (MPa) | 620 - 800 |
| Yield Strength (MPa) | 450 minimum |
| Elongation (%) | 25 minimum |
| Hardness (HB) | 285 maximum |
| Impact Toughness (J at -50°C) | ≥ 40 |
Duplex S31803 – Physical & Thermal Properties
Density of Duplex S31803
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.8 g/cm³ | 0.283 lb/in³ |
Melting Point of Duplex S31803
| Property | Metric | Imperial |
|---|---|---|
| Melting Point | 1430 - 1470 °C | 2610 - 2678 °F |
Specific Heat of Duplex S31803
| Specific Heat of Duplex S31803 | ||
|---|---|---|
| Specific Heat (J/kg·K) | Temperature Range (°C) | Condition |
| 500 | 20 - 100 | Room Temperature |
| 450 | 100 - 600 | Heating |
| 400 | 600 - 1000 | High Temperature |
Electrical Resistivity of Duplex S31803
| Electrical Resistivity | ||
|---|---|---|
| Value (µΩ·m) | Temperature (°C) | Treatment or Condition |
| 70 | 20 | As Rolled |
| 75 | 100 | |
| 80 | 200 | |
| 85 | 300 | |
| 90 | 400 | |
Equivalent of Duplex S31803
| Standard | Werkstoff Nr. | UNS |
|---|---|---|
| ASTM A790 | 1.4462 | S31803 |
| EN 10088-3 | X2CrNiMoN22-5-3 | S31803 |
Manufacturing Process & Heat Treatment of Duplex S31803
Annealing
Annealing of Duplex S31803 is performed at temperatures between 1020°C and 1100°C. This process is crucial for relieving internal stresses and improving ductility. The material is held at the annealing temperature for a sufficient duration to allow for complete phase transformation before being cooled in air.
Forging
Forging of Duplex S31803 is typically conducted at temperatures ranging from 1100°C to 1200°C. This hot working process enhances the mechanical properties of the material by refining the grain structure and improving strength and toughness. The forged components are then allowed to cool slowly to room temperature.
Hardening & Tempering
| Process | Temperature Range (°C) | Quenching Medium | Purpose |
|---|---|---|---|
| Hardening | 1000 - 1050 | Water | To increase hardness and strength |
| Tempering | 600 - 800 | Air | To reduce brittleness and improve toughness |
| Stress Relieving | 400 - 600 | Air | To eliminate residual stresses from manufacturing |
The manufacturing and heat treatment processes of Duplex S31803 are designed to optimize its mechanical properties, ensuring high performance in demanding applications. Proper adherence to these practices guarantees the reliability and durability of the final products.
Various Types
Duplex S31803 Spool - Standard
- Diameter: 2" to 12", Length: 5' to 20'
- Condition: Hot Finished
- Applications: Oil & Gas, Chemical Processing
Duplex S31803 Spool - Custom
- Diameter: Up to 16", Length: Customizable
- Condition: Cold Finished
- Applications: Marine Engineering, Power Generation
Duplex S31803 Spool - High Pressure
- Diameter: 4" to 10", Length: 6' to 15'
- Condition: Hot Finished
- Applications: Petrochemical, Water Treatment
Duplex S31803 Spool - Flanged
- Diameter: 3" to 12", Length: 4' to 10'
- Condition: Cold Finished
- Applications: HVAC, Industrial Piping Systems
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 S31803 Spool
| Material Grade | Thickness | Price (USD / Kg) | Price (INR / Kg) |
|---|---|---|---|
| Duplex S31803 | 3 mm | $2.50 – $3.00 | ₹207 – ₹248 |
| Duplex S31803 | 6 mm | $2.30 – $2.80 | ₹191 – ₹233 |
| Duplex S31803 | 10 mm | $2.10 – $2.60 | ₹174 – ₹216 |
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 S31803 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 S32205 Spool manufacturer
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- Stainless steel spool fabrication services
- Duplex S31803 pipe supplier
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