Duplex 2304 Flanges
Duplex 2304 Flanges are precision-engineered components used extensively in piping systems where corrosion resistance and mechanical strength are paramount. Manufactured from duplex stainless steel grade 2304, these flanges combine the benefits of austenitic and ferritic stainless steel, offering enhanced durability and resistance to stress corrosion cracking. Their balanced microstructure typically contains around 23% chromium and 4% nickel, making them ideal for challenging industrial environments.
These flanges are available in various types including weld neck, slip-on, blind, and threaded designs, accommodating diverse installation needs across sectors such as chemical processing, oil and gas, and marine applications. The duplex nature of the material provides superior toughness and excellent resistance to chloride-induced corrosion, which is critical in offshore and desalination plant operations. Additionally, their high tensile strength allows for reliable performance under high pressure and temperature conditions.
Manufactured in compliance with international standards such as ASTM A182 and ASME B16.5, these flanges undergo rigorous quality control to ensure dimensional accuracy and mechanical properties. Their surface finishes and precise machining meet the requirements for leak-proof sealing when paired with compatible gaskets and bolts. This adherence to specifications ensures seamless integration into global piping systems and contributes to operational safety and longevity.
Due to their robust material properties and adherence to global standards, these components are highly sought after in export markets. Suppliers often provide certification documents including material test reports (MTRs), heat treatment records, and third-party inspection certificates to facilitate smooth customs clearance and client assurance. Packaging is optimized to prevent damage during transit, ensuring the flanges arrive in pristine condition ready for immediate installation.
In summary, duplex stainless steel flanges made from grade 2304 offer a reliable solution for industrial buyers requiring corrosion-resistant, high-strength piping connections. Their versatility across multiple flange types and compliance with stringent international standards make them a preferred choice for projects demanding longevity and performance under harsh operating conditions.
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: 550 MT / Month
- Export Experience: 10+ Years
- Countries Served: 50+
- Annual Export Volume: 5,530 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 various environments
- ✔ High strength and durability, suitable for demanding applications
- ✔ Cost-effective alternative to higher alloyed duplex and super duplex grades
- ✔ Good weldability and formability for easy installation
- ✔ Resistance to stress corrosion cracking and pitting
- ✔ Suitable for industries such as oil and gas, chemical processing, and wastewater treatment
Technical Overview of Duplex 2304 Flanges
| Product | Composition | Usage | Standards |
|---|---|---|---|
| Duplex 2304 Flanges | 22% Cr, 4.5% Ni, 0.2% Mo, balance Fe | Used in chemical processing, oil and gas, and marine applications | ASTM A240, ASTM A182, ASME B16.5 |
| Duplex 2304 Flanges | 22% Cr, 4.5% Ni, 0.2% Mo, balance Fe | Ideal for environments with high chloride exposure | EN 10088-1, EN 10204 |
| Duplex 2304 Flanges | 22% Cr, 4.5% Ni, 0.2% Mo, balance Fe | Suitable for high-strength applications | ISO 15156, NACE MR0175 |
Specifications Table
| Material | Duplex Stainless Steel 2304 |
|---|---|
| Grades | ASTM A240, ASTM A182 |
| Standard | ASME B16.5, ASME B16.47 |
| Size Range | 1/2" to 24" |
| Length | Custom lengths available upon request |
| Form | Flat, Raised Face, Blind |
Available Grades Table
| Product | Composition | Applications |
|---|---|---|
| Duplex 2304 Flanges | Fe, 0.02% C, 0.5% Si, 1.5% Mn, 23% Cr, 4.5% Ni, 0.5% Mo | Oil and gas industry, chemical processing, marine applications |
| Duplex 2304 Flanges | Fe, 0.03% C, 0.5% Si, 2% Mn, 24% Cr, 5% Ni | Wastewater treatment, pulp and paper, food processing |
| Duplex 2304 Flanges | Fe, 0.02% C, 0.5% Si, 1.7% Mn, 22% Cr, 4% Ni, 0.6% Mo | Pharmaceuticals, power generation, desalination |
| Duplex 2304 Flanges | Fe, 0.01% C, 0.4% Si, 2% Mn, 23% Cr, 5% Ni, 0.4% Mo | Construction, automotive, heat exchangers |
| Duplex 2304 Flanges | Fe, 0.02% C, 0.6% Si, 1.5% Mn, 23% Cr, 4.8% Ni, 0.5% Mo | Marine engineering, pressure vessels, offshore structures |
Available Sizes of Duplex 2304 Flanges (MM)
| Size (MM) | Size (MM) |
|---|---|
| 15 | 20 |
| 25 | 32 |
| 40 | 50 |
| 65 | 80 |
| 100 | 125 |
| 150 | 200 |
| 250 | 300 |
| 350 | 400 |
| 450 | 500 |
| 600 | 800 |
Chemical Properties of Duplex 2304 Flanges
| Element | Composition (%) |
|---|---|
| Iron (Fe) | Bal. |
| Chromium (Cr) | 18.0 - 20.0 |
| Nickel (Ni) | 4.5 - 6.5 |
| Molybdenum (Mo) | 0.5 - 1.0 |
| Manganese (Mn) | 1.0 - 2.0 |
| Silicon (Si) | 0.5 - 1.0 |
| Carbon (C) | 0.03 max |
| Phosphorus (P) | 0.03 max |
| Sulfur (S) | 0.02 max |
Mechanical Properties of Duplex 2304 Flanges
| Property | Value |
|---|---|
| Tensile Strength (MPa) | 620 |
| Yield Strength (MPa) | 450 |
| Elongation (%) | 25 |
| Hardness (HB) | 250 |
| Impact Toughness (J at -40°C) | 50 |
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 | 1350 - 1400 °C | 2462 - 2552 °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 | Elevated Temperature |
| 700 | 400 - 600 | High Temperature |
Electrical Resistivity of Duplex 2304 Flanges
| Electrical Resistivity | ||
|---|---|---|
| Value (µΩ·m) | Temperature (°C) | Treatment or Condition |
| 0.75 | 20 | As received |
| 0.76 | 100 | |
| 0.78 | 200 | |
| 0.80 | 300 | |
| 0.82 | 400 | |
Equivalent of Duplex 2304 Flanges
| Standard | Werkstoff Nr. | UNS |
|---|---|---|
| ASTM A240 | 1.4362 | S32304 |
| EN 10088-2 | X2CrNiMoN22-5-3 | S32304 |
Manufacturing Process & Heat Treatment of Duplex 2304 Flanges
Annealing
Annealing of Duplex 2304 flanges is performed to relieve stresses induced during manufacturing processes such as forging and machining. The flanges are heated to a temperature range of 950-1100 °C, followed by controlled cooling. This process enhances ductility and improves the overall mechanical properties of the material.
Forging
The forging of Duplex 2304 flanges involves heating the raw material to approximately 1200 °C and then shaping it under high pressure. This process ensures uniform grain structure and improves the strength of the flanges, making them suitable for high-pressure applications.
Hardening & Tempering
| Process | Temperature Range (°C) | Quenching Medium | Purpose |
|---|---|---|---|
| Hardening | 1000-1100 | Oil | Increase hardness and strength |
| Tempering | 300-600 | Air | Reduce brittleness and enhance toughness |
| Stabilization | 700-850 | Air | Improve corrosion resistance and grain structure |
The combination of these processes ensures that Duplex 2304 flanges exhibit excellent mechanical properties, making them ideal for various industrial applications, particularly in corrosive environments.
Various Types
Duplex 2304 Blind Flange
- Sizes: 1" to 24"
- Condition: Hot Rolled, Cold Drawn
- Applications: Oil & Gas, Chemical Processing
Duplex 2304 Slip-On Flange
- Sizes: 1" to 36"
- Condition: Annealed
- Applications: Piping Systems, Water Treatment
Duplex 2304 Weld Neck Flange
- Sizes: 2" to 30"
- Condition: Cold Worked
- Applications: High Pressure Applications, Industrial Equipment
Duplex 2304 Socket Weld Flange
- Sizes: 1/2" to 4"
- Condition: Pickled and Passivated
- Applications: HVAC Systems, Oil Refineries
Applications & Uses
- Oil & Gas Industry
- Petrochemical Plants
- Water Treatment Plants
- Pharmaceutical Industry
- Food & Beverage Industry
- Automobile Industry
Industries We Serve
Our alloys are widely used across:
- Steel Plants
- Foundries & Casting Units
- Automobile Industry
- Shipbuilding & Marine
- Oil & Gas
- Engineering Components
- Heavy Industrial Machinery
Latest Price List of Duplex 2304 Flanges
| Material Grade | Thickness | Price (USD / Kg) | Price (INR / Kg) |
|---|---|---|---|
| Duplex 2304 | 3 mm | $2.50 – $2.80 | ₹210 – ₹235 |
| Duplex 2304 | 6 mm | $2.40 – $2.70 | ₹200 – ₹225 |
| Duplex 2304 | 10 mm | $2.30 – $2.60 | ₹190 – ₹215 |
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
Cities We Suppllied In India
We exported to 50+ countries worldwide.
Our Certifications
We are a certified manufacturer and exporter, committed to strict quality control and international compliance standards. Below are our key certifications.
GST Certificate
ISO 9001:2015
ISO 1002:2018
Udyam MSME Registration
Quality Inspection & Testing
At Ragnar Metals and Tubes, all products are checked through strict quality inspection and testing to meet international standards such as ASTM, ASME, EN, and DIN. This ensures consistent quality, accurate dimensions, and full material traceability.
- ✔ Chemical composition testing
- ✔ Mechanical tests such as tensile and hardness
- ✔ Dimensional inspection as per standard tolerances
- ✔ PMI, ultrasonic, and visual inspection (if required)
- ✔ EN 10204 3.1 / 3.2 test certificates
- ✔ Third-party inspection by SGS, TUV, BV, or Lloyd’s
Our quality systems support reliable supply for oil & gas, petrochemical, power, marine, and heavy engineering projects.
Our Products Types
People Also Search For
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Frequently Asked Questions
About Ragnar Metals and Tubes
- ✔ Decades of experience in stainless steel, carbon steel, and alloy steel manufacturing
- ✔ ISO 9001:2015 certified company ensuring strict quality control standards
- ✔ Specialized in cold drawn pipes and tubes processing
- ✔ State-of-the-art manufacturing facilities with modern machinery
- ✔ Precision-engineered products with consistent quality and reliability
- ✔ Customized steel solutions as per client drawings and specifications
- ✔ Compliance with international industry standards
- ✔ Trusted supplier for critical industrial applications worldwide