Stainless Steel 321 Flanges are high-quality, durable flanges manufactured from the 321 grade of stainless steel, known for its excellent oxidation resistance and high-temperature strength. Ferro Fittings and Alloys, based in Mumbai, India, specializes in the production and export of these flanges, ensuring they meet the demanding requirements of various industrial applications worldwide.
These flanges conform to several international standards, including ASTM, ASME, and DIN, providing assurance of quality and performance. Available sizes range from DN 10 to DN 600 (NPS ½ to NPS 24), with pressure ratings from Class 150 to Class 2500 (PN10 to PN400). They are designed to withstand temperatures up to 900°C (1650°F) and can feature various end connections such as weld neck, slip-on, and threaded, making them versatile for a range of applications.
Industries leveraging Stainless Steel 321 Flanges include Oil & Gas, Petrochemical, Chemical Processing, Power Generation, Pharmaceutical, Shipbuilding, and Water Treatment. These flanges are crucial in projects across regions such as the UAE, Saudi Arabia, and the UK, whether for EPC contracts, LSTK projects, or maintenance operations, ensuring reliability and safety in critical systems.
Ferro Fittings and Alloys is proud to be ISO 9001:2015 certified, ensuring our products are manufactured under stringent quality controls. We provide EN 10204 3.1 / 3.2 Mill Test Certificates, and our in-house testing capabilities include PMI, Hydrostatic, Hardness, Impact (Charpy), and UT. Our products also comply with NACE MR 0175 / ISO 15156 standards for sour service applications. Request a free MTC sample or get a quick quote via WhatsApp.
Choosing Ferro Fittings means benefiting from a competitive lead time of just 2–4 weeks and no minimum order quantity restrictions, ensuring stock availability for urgent requirements. We offer FOB Mumbai, CIF, and CFR shipping terms with comprehensive export documentation. For inquiries, call us at +91-86550-39959, message us on WhatsApp at wa.me/+918655039959, or email export@ferrofittings.com.
Trusted manufacturer & exporter of Flanges, Pipe Fittings and Valves in 30+ countries.
1–4 weeks depending on size, grade & quantity.
Urgent and bulk orders handled efficiently.FOB, CIF, CFR, EXW, DDP (Incoterms 2020).
Door-to-port and door-to-door delivery available.Sea Freight / Air Cargo / Express Courier.
Complete export documentation & tracking support.Trusted by EPC contractors, procurement teams, and global industrial buyers across multiple countries for certified supply and reliable delivery.
Direct supply with bulk stock availability to reduce your overall project cost.
ISO 9001, ISO 14001, ISO 45001, PED certified with full test certificates.
Safe, sea-worthy packaging ensuring damage-free international delivery.
Selecting the right partner for Stainless Steel 321 Flanges is critical for ensuring product quality, long-term performance, and successful project execution. As a trusted manufacturer and exporter, Ferro Fittings and Alloys delivers high-quality materials meeting international standards and global industry requirements.
Understand the key differences between local suppliers, trading companies, and professional manufacturers & exporters like Ferro Fittings and Alloys.
| Evaluation Factor | Small Local Suppliers | Trading Companies | Ferro Fittings and Alloys |
|---|---|---|---|
| Manufacturing Control | Limited or outsourced production | Dependent on third-party mills | Direct manufacturing with strict quality control |
| Standards Compliance | Basic or local standards | Varies depending on supplier | ASTM, ASME, ANSI, EN, ISO certified products |
| Inspection & Certification | Limited documentation | Inconsistent certification | MTC, TPI, and full export documentation provided |
| Export Capability | Mostly domestic supply | Moderate export handling | Global exports with complete logistics support |
| Delivery Reliability | Uncertain timelines | Depends on sourcing chain | Consistent lead times with ready stock availability |
| Project Risk Level | High | Medium | Low |
| Product | Composition | Standard | Application |
|---|---|---|---|
| Stainless Steel 321 Flanges | C: ≤ 0.08%, Cr: 17.0-19.0%, Ni: 9.0-12.0%, Ti: 5xC to 0.70% | ASTM A182, ASME SA182 | Used in high-temperature applications, such as chemical processing and oil & gas industries |
| Stainless Steel 321 Flanges | C: ≤ 0.08%, Cr: 17.0-19.0%, Ni: 9.0-12.0%, Ti: 5xC to 0.70% | EN 10204 3.1 / 3.2 MTC | Ideal for applications requiring resistance to intergranular corrosion |
| Stainless Steel 321 Flanges | C: ≤ 0.08%, Cr: 17.0-19.0%, Ni: 9.0-12.0%, Ti: 5xC to 0.70% | DIN 17440 | Commonly used in aerospace and automotive applications |
Ferro Fittings and Alloys specializes in the manufacturing of high-quality Stainless Steel 321 Flanges, known for their excellent resistance to high-temperature oxidation and corrosion. Our products comply with international standards such as ASTM, ASME, and DIN, ensuring reliability and durability in demanding environments. We conduct rigorous in-house testing, including PMI, hardness, and hydrostatic tests, to guarantee that our flanges meet the highest quality standards. With a lead time of 2–4 weeks and the capability to accommodate urgent orders, we ensure quick delivery to over 50 countries, including the UAE, USA, and Germany. Contact us for a quick quote or request a free sample MTC today!
SS 321 flanges are a titanium-stabilized austenitic stainless-steel flange material, particularly useful where the flange will see elevated temperatures and welding.
The most common designation is ASTM A182 Grade F321 / UNS S32100. ASTM A182 is the relevant forging specification for flanges and other pressure-containing forged components.
Our F321 flange range includes Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint, Long Weld Neck, Orifice, Reducing, Spectacle Blind and custom-designed flanges, manufactured or supplied according to applicable international standards and customer specifications.
Typical dimensional and rating standards include ASME B16.5, ASME B16.47, ASME B16.36, ASME B16.48, EN 1092-1, DIN, JIS and applicable GB standards, depending on the project.
| Specification | SS321 Flanges |
|---|---|
| Material | Stainless Steel |
| Grades | SS321 |
| ASTM Grades | ASTM A182 F321 |
| ASME Material Specification | ASME SA182 F321 |
| UNS | S32100 |
| EN Grades | 1.4541 / X6CrNiTi18-10 |
| JIS Grades | SUS321 |
| Standards | ASME B16.5, ASME B16.47, EN 1092-1, JIS B2220 and other applicable standards |
| Size | NPS ½" to 24" (DN15–DN600) as per ASME B16.5; larger sizes NPS 26" to 60" available as per applicable standards ASME B16.47 |
| Pressure Rating | ASME Class 150–2500; PN ratings as per applicable EN/DIN standards |
| Flange Types | Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint, Long Weld Neck, Orifice, Reducing, Spectacle Blind |
| Facing | RF, FF, RTJ, Male & Female, Tongue & Groove, as applicable |
| Bore | Standard pipe schedules or custom bore as specified |
| Manufacturing | Forged / Hot Forged & Machined |
| Heat Treatment | Solution Heat Treatment as per applicable material specification |
| Testing | Chemical, Mechanical, Dimensional, Visual, PMI and NDT as specified |
| Certification | EN 10204 3.1 / 3.2 and Third-Party Inspection, as required |
| Applications | Oil & Gas, Chemical, Petrochemical, Marine, Pharmaceutical, Food, Water Treatment, Power and Process Industries |
| Grade / UNS | Common Name | Key Feature | Typical Application |
|---|---|---|---|
| S32100 | Stainless Steel 321 | Excellent resistance to intergranular corrosion | Aerospace, chemical processing, and oil and gas industries |
| S32109 | Stainless Steel 321H | Higher carbon content for improved high-temperature strength | High-temperature applications, such as furnace components |
| S32101 | Stainless Steel 321L | Low carbon variant for enhanced weldability | Welded structures in corrosive environments |
| S32103 | Stainless Steel 321Ti | Titanium stabilized for enhanced corrosion resistance | Applications in acidic environments and high temperatures |
| S32104 | Stainless Steel 321F | Free machining variant for improved machinability | Manufacturing of complex shapes and components |
| Size / DN | Pressure Class | Wall Thickness | Length |
|---|---|---|---|
| 1/2" (15 mm) | 150 | 0.120" (3.05 mm) | 5.0" (127 mm) |
| 3/4" (20 mm) | 150 | 0.120" (3.05 mm) | 5.0" (127 mm) |
| 1" (25 mm) | 150 | 0.120" (3.05 mm) | 5.0" (127 mm) |
| 1-1/2" (40 mm) | 150 | 0.120" (3.05 mm) | 5.0" (127 mm) |
| 2" (50 mm) | 150 | 0.120" (3.05 mm) | 5.0" (127 mm) |
| 3" (80 mm) | 150 | 0.120" (3.05 mm) | 5.0" (127 mm) |
Typical specification limits, wt.%:
| Element | ASTM A182 F321 requirement |
|---|---|
| Carbon (C) | 0.08 max |
| Silicon (Si) | 1.00 max |
| Manganese (Mn) | 2.00 max |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.030 max |
| Chromium (Cr) | 17.00–19.00 |
| Nickel (Ni) | 9.00–12.00 |
| Nitrogen (N) | 0.10 max |
| Titanium (Ti) | 5 × (C + N) min, 0.70 max |
| Iron (Fe) | Balance |
The Ti requirement is the important feature of 321. Titanium stabilizes the steel by preferentially combining with carbon, reducing chromium-carbide precipitation and the associated risk of intergranular corrosion after welding or exposure to elevated temperatures.
For forged flanges to ASTM A182 F321, typical minimum requirements are:
| Property | Requirement |
|---|---|
| Tensile strength | 515 MPa min |
| Yield strength, 0.2% | 205 MPa min |
| Elongation | 30% min |
| Hardness | 217 HBW max / 95 HRB max |
| Property | Value (Metric) | Value (Imperial) |
|---|---|---|
| Density | 7.93 g/cm³ | 0.286 lb/in³ |
| Melting Point | 1450 °C | 2642 °F |
| Specific Heat | 500 J/(kg·K) | 0.12 BTU/(lb·°F) |
| Thermal Conductivity | 16.2 W/(m·K) | 112 BTU·in/(hr·ft²·°F) |
| Electrical Resistivity | 0.73 µΩ·m | 0.73 µΩ·in |
| Standard | Equivalent designation |
|---|---|
| ASTM/AISI | 321 |
| ASTM forging | A182 F321 |
| UNS | S32100 |
| EN | 1.4541 |
| EN designation | X6CrNiTi18-10 |
| JIS | SUS321 |
| BS | 321S31 |
| AFNOR | Z6CNT18-10 |
| DIN | X10CrNiTi18-9 / X6CrNiTi18-10 |
| Russian/GOST | 08Kh18N10T |
SS321 flanges are particularly suitable for:
321 is commonly selected for applications where ordinary 304 stainless steel may suffer sensitization after prolonged exposure to elevated temperature.
The raw materials used for manufacturing Stainless Steel 321 Flanges are inspected against ASTM A240/A240M specifications to ensure compliance with the required chemical composition and mechanical properties. Each batch of raw material undergoes Positive Material Identification (PMI) testing to confirm the alloy grade, ensuring high-quality production standards.
The forming and fabrication of Stainless Steel 321 Flanges involve processes such as forging, machining, and welding. These processes are executed in accordance with ASME B16.5 standards, ensuring precise dimensions and tolerances. The standard flange sizes range from 1/2" to 24" in diameter, with pressure ratings of Class 150 to Class 2500.
| Process | Temperature (°C) | Medium | Purpose |
|---|---|---|---|
| Solution Annealing | 1000 - 1100 | Air | To enhance corrosion resistance and relieve stress |
| Stabilization Treatment | 600 - 850 | Air | To reduce sensitization and improve intergranular corrosion resistance |
Each batch of Stainless Steel 321 Flanges undergoes rigorous quality inspection and testing, including Hydrostatic Testing, Impact Testing (Charpy), and Radiography. Compliance with EN 10204 3.1 / 3.2 Material Test Certificates is maintained, ensuring that our products meet international standards. Our commitment to quality is backed by ISO 9001:2015 certification. Contact us for a quick quote or request a free sample MTC to experience our quality firsthand.
| Grade | Size / Dimension | Price (USD/Kg) | Price (INR/Kg) |
|---|---|---|---|
| SS 321 | 1/2" (15 mm) | $4.50 | ₹370 |
| SS 321 | 1" (25 mm) | $4.80 | ₹395 |
| SS 321 | 2" (50 mm) | $5.20 | ₹430 |
| SS 321 | 4" (100 mm) | $6.00 | ₹495 |
Note: Prices are indicative and subject to change based on quantity, raw material costs, and delivery terms. Contact us for the latest quotation.
Our multiple locations and strong logistics network make it easy for customers across India to source Stainless Steel 321 Flanges from Ferro Fittings and Alloys. Contact us for prompt delivery at competitive prices.
Ferro Fittings and Alloys exports Stainless Steel 321 Flanges to 50+ countries worldwide. We handle all export documentation, sea-worthy packaging, and logistics to ensure on-time, damage-free delivery anywhere in the world.
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Ferro Fittings and Alloys is a leading ISO 9001:2015 certified manufacturer, supplier, and exporter of high-quality pipe fittings, valves, flanges, round bars, sheets, plates, pipes, tubes, and expansion bellows. Based in Mumbai, India, we serve industrial sectors including oil & gas, petrochemical, power generation, pharmaceuticals, marine, and construction.
We supply a comprehensive range of grades — Stainless Steel, Duplex & Super Duplex, Carbon Steel, Alloy Steel, Inconel, Hastelloy, Monel, Titanium, Nickel, and Nimonic Alloys — to customers in 50+ countries. Our products are manufactured as per ASTM, ASME, ANSI, MSS, BS, DIN, and EN standards with EN 10204 3.1/3.2 Mill Test Certificates.
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📞 Mr. Aashit Shah: +91 86524 99959
📞 Mr. Bhavin Shah: +91 86550 39959
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