Duplex S31803 Spool
Duplex S31803 Spool is a critical component in piping systems, known for its exceptional corrosion resistance and mechanical strength. Manufactured from duplex stainless steel grade 31803, this spool combines the benefits of austenitic and ferritic stainless steels, offering superior durability in harsh environments. Its dual-phase microstructure provides enhanced resistance to stress corrosion cracking and pitting, making it ideal for demanding industrial applications.
This type of spool is commonly used in sectors such as oil and gas, chemical processing, and marine industries, where exposure to aggressive media and high pressures is frequent. The material's high chromium, molybdenum, and nitrogen content ensures longevity and reliability in pipelines transporting corrosive fluids. Additionally, its excellent weldability and toughness at low temperatures make it a preferred choice for critical infrastructure projects.
Fabricated to precise engineering standards, these spools are available in various sizes and pressure ratings to accommodate different system requirements. The dimensional accuracy and surface finish comply with international standards such as ASTM A182 and ASME B16.11, ensuring seamless integration into existing piping networks. Customization options, including specific end connections and heat treatment, are often provided based on client specifications.
Export readiness is a key consideration, with suppliers adhering to stringent quality control protocols and certification processes. Documentation such as mill test reports, material traceability, and compliance certificates are furnished to facilitate smooth customs clearance and regulatory approvals worldwide. Packaging solutions are designed to protect the components during transit, ensuring they arrive in optimal condition for immediate installation.
Industrial buyers seeking reliable and high-performance piping components will find this duplex stainless steel spool an excellent investment. Its blend of strength, corrosion resistance, and adaptability supports long-term operational efficiency in critical infrastructure, reducing maintenance costs and downtime. Partnering with experienced manufacturers guarantees access to premium quality products tailored to specific industrial demands.
Lead Time
2–7 weeks depending on size
Delivery Terms
FOB, CIF, DDP
Shipping Modes
Sea / Air / Express
Why Duplex S31803 Spool 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
- 2. How to Choose the Right Manufacturer
- 3.Comparison of Duplex S31803 Spool
- 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
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
| 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 various environments
- ✔ High strength compared to standard austenitic stainless steels
- ✔ Good weldability and formability for versatile applications
- ✔ Superior resistance to stress corrosion cracking
- ✔ Temperature stability up to 300°C (572°F)
- ✔ Cost-effective solution for demanding industrial applications
Technical Overview of Duplex S31803 Spool
| Product | Composition | Usage | Standards |
|---|---|---|---|
| Duplex S31803 Spool | 22% Cr, 5% Ni, 3.2% Mo, 0.17% N | Used in piping systems for oil and gas applications | ASTM A790, ASME SA790 |
| Duplex S31803 Spool | 22% Cr, 5% Ni, 3.2% Mo, 0.17% N | Suitable for high strength and corrosion resistance | API 5L, ISO 15156 |
| Duplex S31803 Spool | 22% Cr, 5% Ni, 3.2% Mo, 0.17% N | Ideal for sour service environments | NACE MR0175, NACE MR0103 |
Specifications Table
| Material | Duplex Stainless Steel S31803 |
|---|---|
| Grades | S31803 |
| Standard | ASTM A790 / A928 |
| Size Range | 1/2" to 24" NPS |
| Length | Up to 20 feet |
| Form | Spool |
Available Grades Table
| Product | Composition | Applications |
|---|---|---|
| Duplex S31803 Spool | 22% Cr, 5% Ni, 3% Mo | Oil and gas, chemical processing, marine environments |
| Duplex S32205 Spool | 22% Cr, 5.6% Ni, 3.2% Mo | High strength applications, offshore platforms, pulp and paper industry |
| Duplex S32750 Spool | 25% Cr, 7% Ni, 4% Mo | Seawater applications, petrochemical industry, desalination plants |
| Duplex S32760 Spool | 25% Cr, 7% Ni, 4% Mo, 0.5% N | High chloride environments, oil and gas production |
| Duplex S31803 Super Duplex Spool | 24% Cr, 7% Ni, 4% Mo, 0.2% N | Long-term corrosion resistance, chemical processing |
Available Sizes of Duplex S31803 Spool (MM)
| Size (MM) | Size (MM) |
|---|---|
| 50 | 100 |
| 60 | 110 |
| 70 | 120 |
| 80 | 130 |
| 90 | 140 |
| 100 | 150 |
| 110 | 160 |
| 120 | 180 |
| 130 | 200 |
| 140 | 220 |
Chemical Properties of Duplex S31803 Spool
| Element | Composition (%) |
|---|---|
| Chromium (Cr) | 22.0 - 23.0 |
| Nickel (Ni) | 4.5 - 6.5 |
| Molybdenum (Mo) | 3.0 - 3.5 |
| Iron (Fe) | Balance |
| Manganese (Mn) | 0.8 - 1.5 |
| Silicon (Si) | ≤ 1.0 |
| Carbon (C) | ≤ 0.03 |
| Sulfur (S) | ≤ 0.01 |
Mechanical Properties of Duplex S31803 Spool
| Property | Value |
|---|---|
| Tensile Strength (MPa) | 620 - 850 |
| Yield Strength (MPa) | 450 min |
| Elongation (%) | 25 min |
| Hardness (HB) | 250 max |
| Impact Toughness (J at -50°C) | 50 min |
Duplex S31803 Spool – Physical & Thermal Properties
Density of Duplex S31803 Spool
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.8 g/cm3 | 0.282 lb/in3 |
Melting Point of Duplex S31803 Spool
| Property | Metric | Imperial |
|---|---|---|
| Melting Point | 1400 - 1450 °C | 2552 - 2642 °F |
Specific Heat of Duplex S31803 Spool
| Specific Heat of Duplex S31803 Spool | ||
|---|---|---|
| Specific Heat (J/kg·K) | Temperature Range (°C) | Condition |
| 500 | 20 - 100 | Annealed |
| 460 | 100 - 400 | Annealed |
| 400 | 400 - 800 | Annealed |
Electrical Resistivity of Duplex S31803 Spool
| Electrical Resistivity | ||
|---|---|---|
| Value (µΩ·m) | Temperature (°C) | Treatment or Condition |
| 0.72 | 20 | As-Received |
| 0.75 | 100 | |
| 0.78 | 200 | |
| 0.80 | 300 | |
| 0.82 | 400 | |
Equivalent of Duplex S31803 Spool
| Standard | Werkstoff Nr. | UNS |
|---|---|---|
| ASTM A790 | 1.4462 | S31803 |
| EN 10088-3 | X2CrNiMoN22-5-3 | S31803 |
Manufacturing Process & Heat Treatment of Duplex S31803 Spool
Annealing
Annealing of Duplex S31803 is performed at temperatures between 1020°C and 1100°C. This process helps to relieve residual stresses, enhance ductility, and improve the overall mechanical properties of the material. After annealing, the material is slowly cooled to room temperature, which aids in the formation of a balanced microstructure of austenite and ferrite phases.
Forging
The forging process for 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 the strength and toughness. The forged spool is then allowed to cool to ambient temperature before further processing.
Hardening & Tempering
| Process | Temperature Range (°C) | Quenching Medium | Purpose |
|---|---|---|---|
| Hardening | 1000 - 1100 | Oil | To increase hardness and strength of the material |
| Tempering | 600 - 800 | Air | To reduce brittleness and improve toughness |
| Stabilization | 750 - 850 | Air | To enhance resistance to stress corrosion cracking |
The manufacturing and heat treatment processes for Duplex S31803 spools are critical in achieving the desired mechanical properties and corrosion resistance, ensuring reliable performance in various industrial applications.
Various Types
Duplex S31803 Spool - Standard
- Diameter: 100 mm, Length: 500 mm
- Condition: Hot Finished
- Applications: Oil and Gas, Chemical Processing
Duplex S31803 Spool - Custom
- Diameter: 150 mm, Length: 1000 mm
- Condition: Cold Drawn
- Applications: Marine Applications, Heat Exchangers
Duplex S31803 Spool - High-Pressure
- Diameter: 200 mm, Length: 750 mm
- Condition: Annealed
- Applications: High-Pressure Systems, Power Generation
Duplex S31803 Spool - Large Diameter
- Diameter: 250 mm, Length: 1200 mm
- Condition: Pickled and Passivated
- Applications: Pulp and Paper, Desalination Plants
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 | $4.50 – $5.00 | ₹370 – ₹410 |
| Duplex S31803 | 6 mm | $4.30 – $4.80 | ₹360 – ₹400 |
| Duplex S31803 | 10 mm | $4.10 – $4.60 | ₹350 – ₹390 |
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
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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