Duplex 2304 Flanges
Duplex 2304 flanges are precision-engineered components crafted from duplex stainless steel grade 2304, a material known for its excellent corrosion resistance and high strength. These flanges serve as critical connectors in piping systems, enabling the secure joining of pipes, valves, and other equipment. Manufactured to meet stringent industry standards, they offer enhanced durability in demanding environments where both mechanical performance and chemical resistance are essential.
Constructed from a balanced microstructure of austenitic and ferritic phases, these flanges exhibit superior resistance to stress corrosion cracking and pitting, making them ideal for use in offshore, chemical processing, and marine applications. Their robust composition allows them to withstand aggressive media and temperature variations, ensuring long-term reliability in harsh operational contexts.
Available in various designs such as slip-on, weld neck, and blind, these components conform to international standards including ASME, ASTM, and EN. This versatility allows for seamless integration into existing systems across industries like oil and gas, petrochemical, and power generation. The precise machining and finishing ensure proper fitment and leak-tight performance, critical for maintaining system integrity.
With a focus on export readiness, these flanges undergo rigorous quality control procedures, including dimensional inspections and material certification, to comply with global regulatory requirements. Packaging is optimized for safe transit, minimizing the risk of damage during shipping and handling. Suppliers often provide comprehensive documentation to facilitate customs clearance and assure buyers of product authenticity.
For industrial buyers seeking reliable, high-performance components, these duplex stainless steel flanges represent a strategic investment. Their combination of strength, corrosion resistance, and compliance with international standards supports operational efficiency and longevity, making them an excellent choice for critical infrastructure projects worldwide.
Lead Time
2–7 weeks depending on size
Delivery Terms
FOB, CIF, DDP
Shipping Modes
Sea / Air / Express
Why Duplex 2304 Flanges 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 2304 Flanges
- 2. How to Choose the Right Manufacturer
- 3.Comparison of Duplex 2304 Flanges
- 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 2304 Flanges
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 2304 Flanges
| 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 2304 Flanges
- ✔ Excellent corrosion resistance in both acidic and alkaline environments
- ✔ High strength and durability, ideal for demanding applications
- ✔ Good weldability and formability, facilitating ease of installation
- ✔ Cost-effective alternative to higher alloyed stainless steels
- ✔ Resistance to stress corrosion cracking and pitting
- ✔ Wide range of applications including oil and gas, chemical processing, and wastewater treatment
Technical Overview of Duplex 2304 Flanges
| Product | Composition | Usage | Standards |
|---|---|---|---|
| Duplex 2304 Flanges | 22% Cr, 4% Ni, 0.2% N, balance Fe | Used in chemical processing, oil and gas, and marine applications | ASTM A240, ASME SA240 |
| Duplex 2304 Flanges | 22% Cr, 4% Ni, 0.2% N, balance Fe | Suitable for environments with high chloride levels | ISO 15156, NACE MR0175 |
| Duplex 2304 Flanges | 22% Cr, 4% Ni, 0.2% N, balance Fe | Commonly used for piping systems and pressure vessels | EN 10204, ASTM A182 |
Specifications Table
| Material | Duplex Stainless Steel 2304 |
|---|---|
| Grades | S32304 |
| Standard | ASTM A240/A240M |
| Size Range | 1/2" to 24" |
| Length | Customizable; typically 1/2" to 2" |
| Form | Flanges (Slip-on, Weld Neck, Blind, Socket Weld) |
Available Grades Table
| Product | Composition | Applications |
|---|---|---|
| Duplex 2304 Flange | Fe, 22% Cr, 4.5% Ni, 0.2% Mo | Oil and gas, petrochemical, marine applications |
| Duplex 2304 Flange - ASTM A240 | Fe, 22% Cr, 4.5% Ni, 0.2% Mo | High strength and good corrosion resistance in chlorinated environments |
| Duplex 2304 Flange - UNS S32304 | Fe, 22% Cr, 4.5% Ni, 0.2% Mo | Water treatment, pulp and paper processing |
| Duplex 2304 Flange - EN 1.4362 | Fe, 22% Cr, 4.5% Ni, 0.2% Mo | Structural applications where strength and corrosion resistance are required |
| Duplex 2304 Flange - ISO 9445 | Fe, 22% Cr, 4.5% Ni, 0.2% Mo | Food processing and chemical industries |
Available Sizes of Duplex 2304 Flanges (MM)
| Size (MM) | Size (MM) |
|---|---|
| 10 | 15 |
| 20 | 25 |
| 30 | 35 |
| 40 | 50 |
| 60 | 70 |
| 80 | 90 |
| 100 | 110 |
| 120 | 130 |
| 140 | 150 |
| 160 | 180 |
Chemical Properties of Duplex 2304 Flanges
| Element | Composition (%) |
|---|---|
| Chromium (Cr) | 19.0 - 22.0 |
| Nickel (Ni) | 1.5 - 4.5 |
| Molybdenum (Mo) | 0.1 - 0.5 |
| Manganese (Mn) | 5.0 - 7.0 |
| Nitrogen (N) | 0.08 - 0.20 |
| Silicon (Si) | 0.5 max |
| Carbon (C) | 0.03 max |
| Iron (Fe) | Balance |
Mechanical Properties of Duplex 2304 Flanges
| Property | Value |
|---|---|
| Tensile Strength (MPa) | 500-620 |
| Yield Strength (MPa) | 350-450 |
| Elongation (%) | 25 |
| Hardness (HB) | 200-250 |
| Impact Toughness (J at -40°C) | ≥ 40 |
Duplex 2304 Flanges – Physical & Thermal Properties
Density of Duplex 2304 Flanges
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.1 g/cm³ | 0.256 lb/in³ |
Melting Point of Duplex 2304 Flanges
| Property | Metric | Imperial |
|---|---|---|
| Melting Point | 1390 - 1450 °C | 2534 - 2642 °F |
Specific Heat of Duplex 2304 Flanges
| Specific Heat of Duplex 2304 Flanges | ||
|---|---|---|
| Specific Heat (J/kg·K) | Temperature Range (°C) | Condition |
| 500 | 20 - 100 | Room Temperature |
| 600 | 100 - 400 | Heating |
| 700 | 400 - 800 | High Temperature |
Electrical Resistivity of Duplex 2304 Flanges
| Electrical Resistivity | ||
|---|---|---|
| Value (µΩ·m) | Temperature (°C) | Treatment or Condition |
| 0.70 | 20 | As Rolled |
| 0.72 | 100 | |
| 0.75 | 200 | |
| 0.78 | 300 | |
| 0.80 | 400 | |
Equivalent of Duplex 2304 Flanges
| Standard | Werkstoff Nr. | UNS |
|---|---|---|
| EN 1.4362 | 1.4362 | S32304 |
| ASTM A240 | 1.4362 | S32304 |
Manufacturing Process & Heat Treatment of Duplex 2304 Flanges
Annealing
The annealing process for Duplex 2304 flanges involves heating the material to a temperature range of 1020 to 1100 °C, followed by air cooling. This process helps to relieve internal stresses, improve ductility, and refine the microstructure, ensuring optimal mechanical properties for the final product.
Forging
Forging of Duplex 2304 flanges is typically performed at a temperature of around 1100 °C to 1200 °C. This hot working process enhances the mechanical properties of the material by refining the grain structure and achieving desired shapes and dimensions, while also improving strength and toughness.
Hardening & Tempering
| Process | Temperature Range (°C) | Quenching Medium | Purpose |
|---|---|---|---|
| Hardening | 1000 - 1100 | Water or Oil | Increase hardness and strength |
| Tempering | 300 - 600 | Air | Reduce brittleness and improve toughness |
| Solution Treatment | 1020 - 1100 | Air | Enhance corrosion resistance and stabilize the microstructure |
The combination of these processes ensures that Duplex 2304 flanges achieve the necessary mechanical properties and corrosion resistance required for various industrial applications, making them suitable for use in challenging environments.
Various Types
Duplex 2304 Blind Flange
- Dimensions: 1" to 24"
- Condition: ASTM A182, ASME SA182
- Applications: Piping systems, Oil and gas, Chemical processing
Duplex 2304 Slip-On Flange
- Dimensions: 1" to 30"
- Condition: ASTM A240, ASME SA240
- Applications: Water treatment, Food processing, Marine applications
Duplex 2304 Weld Neck Flange
- Dimensions: 1" to 36"
- Condition: ANSI B16.5, BS 4504
- Applications: Power generation, Pharmaceutical, Petrochemical
Duplex 2304 Socket Weld Flange
- Dimensions: 1/2" to 4"
- Condition: ASTM A182, ASME SA182
- Applications: Aerospace, HVAC, Water distribution
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 2304 Flanges
| Material Grade | Thickness | Price (USD / Kg) | Price (INR / Kg) |
|---|---|---|---|
| Duplex 2304 | 3 mm | $3.50 – $4.00 | ₹290 – ₹320 |
| Duplex 2304 | 6 mm | $3.30 – $3.80 | ₹270 – ₹310 |
| Duplex 2304 | 10 mm | $3.10 – $3.60 | ₹250 – ₹300 |
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 2304 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.
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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