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Jai Hind Metal is a reliable manufacturer and supplier of Stainless Steel 321/321H Flanges, supplying quality piping components for customers across different industrial sectors. We recognize that every application can have its own requirements related to flange dimensions, material grade, pressure rating, and applicable standards, so our manufacturing process is planned around the specifications provided by the customer. Each flange is carefully examined before shipment for dimensional accuracy, surface quality, strength, and overall finish. Our inspection team performs checks at different stages of production to maintain consistency, and third-party inspection can also be arranged when requested. With well-managed stock and suitable storage facilities, we can support both regular procurement and urgent project requirements for customers around the world.
We give the same attention to product protection and order handling as we do to manufacturing. Stainless Steel 321/321H Flanges are securely packed with appropriate materials to help protect their surfaces from scratches, moisture, and transit-related damage. If a project requires particular packing methods, labeling, or additional protection, customized packaging can be arranged accordingly. Our team works with dependable logistics providers to coordinate shipments and help ensure delivery reaches the required destination safely and on schedule. By combining careful production, systematic inspection, secure packing, and responsive communication, Jai Hind Metal aims to make the overall buying process straightforward and dependable for every customer.
Precisely manufactured metal products meeting demanding industrial standards.
Consistent quality, reliable performance, and strict inspection at every stage.
Available in customized sizes, grades, thicknesses, and specifications.
Efficient processing, secure packaging, and dependable delivery worldwide.
Stainless Steel 321/321H Flanges are manufactured from high-quality austenitic stainless steel containing chromium, nickel, and titanium, providing excellent corrosion resistance, strength, and stability at elevated temperatures. These flanges are well suited for demanding service conditions and can be produced in various types, sizes, pressure ratings, and dimensions to meet specific piping requirements. The addition of titanium helps stabilize the material and reduces the risk of chromium carbide precipitation during prolonged exposure to high temperatures, making it suitable for welded and heat-intensive applications. SS 321 offers good formability and weldability, while SS 321H, with its higher carbon content, provides improved strength for high-temperature service. Their durability, thermal stability, and resistance to oxidation make Stainless Steel 321/321H Flanges a suitable choice for a wide range of industrial applications.
In the annealed condition, Stainless Steel 321/321H Flanges offer a strong combination of corrosion resistance, thermal stability, and mechanical strength, making them suitable for demanding industrial environments. They are commonly used in chemical processing equipment, heat exchangers, petrochemical plants, furnace components, aerospace systems, and high-temperature process piping where reliable performance is required. Both SS 321 and SS 321H are stabilized with titanium, which helps reduce chromium carbide precipitation during prolonged exposure to elevated temperatures and supports good corrosion resistance after welding. SS 321H has a higher carbon content than standard 321, providing improved strength for high-temperature service. With good weldability, durability, resistance to oxidation, and stability at elevated temperatures, Stainless Steel 321/321H Flanges are well suited for critical piping and equipment connections.
Stainless Steel 321 / 321H Flanges are primarily composed of iron, chromium, and nickel, with titanium added as a stabilizing element. The chromium content provides good resistance to corrosion and oxidation, while nickel contributes to strength, toughness, and stability in demanding environments. Titanium helps minimize chromium carbide precipitation during welding and prolonged exposure to elevated temperatures. Grade 321H contains a higher carbon level than standard 321, offering improved strength and creep resistance at high temperatures, making it well suited for applications involving sustained heat.
| A182 Gr F321 / 321H Flange Size Chart | 1/2″ (15 NB) to 48″ (1200NB) DN10~DN5000 |
|---|---|
| Stainless Steel 321 / 321H Flange Standards | ANSI/ASME B16.5, B16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, GOST Flange, ASME/ANSI B16.5/16.36/16.47A/16.47B, MSS S44, ISO70051, JISB2220, BS1560-3.1, API7S-15, API7S-43, API605, EN1092 |
| SS Grade F321 / 321H Flange Pressure Rating ANSI | Class 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS |
| ASTM A182 F321 / 321H Stainless Steel Flanges Pressure Calculation in DIN | 6Bar 10Bar 16Bar 25Bar 40Bar / PN6 PN10 PN16 PN25 PN40, PN64 |
| ASME SA 182 F321 / 321H Flange | 5K, 10 K, 16 K 20 K, 30 K, 40 K, 63 K |
| ASME SA182 321 / 321H Stainless Steel Flange UNI | 6Bar 10Bar 16Bar 25Bar 40Bar |
| A182 F321 / 321H Flange EN | 6Bar 10Bar 16Bar 25Bar 40Bar |
| Coating | Oil Black Paint, Anti-rust Paint, Zinc Plated, Yellow Transparent, Cold and Hot Dip Galvanized |
| Most common types of ASTM A182 F321 / 321H Stainless Steel Flange | Forged / Threaded / Screwed / Plate |
| Test Certificates | EN 10204/3.1B Raw Materials Certificate 100% Radiography Test Report Third Party Inspection Report, etc |
| ASME SA182M SS 321 / 321H Flange Production technique | Forged, Heat treated and machined |
| A182 Grade F321 / 321H Flange Connect Type/ Flange Face Type | Raised Face (RF), Ring Type Joint (RTJ), Flat Face (FF), Large Male-Female (LMF), Lap-Joint Face (LJF), Small Male-Female (SMF), Small Tongue, Large Tongue & Groove, Groove |
| Special design | As per your drawing AS, ANSI, BS, DIN and JIS |
| ASME A182 SS 321 / 321H Flange Test | Direct-reading Spectrograph, Hydrostatic testing machine, X-ray detector, UI trasonic flaw detector, Magnetic particle detector |
| ASTM A182 SS 321 / 321H Flange Equipment | Press machine, Bending machine, Pushing Machine, electric bevelling machine, Sand-blasting machine etc |
| SS 321 / 321H Flange Origin | Indian / West Europe / Japan / USA / Korean |
| Manufacturer of Stainless Steel ASTM A182 F321 / 321H Flange | ANSI DIN, GOST, JIS, UNI, BS, AS2129, AWWA, EN, SABS, NFE etc. B.S: BS4504 , BS3293, BS1560, BS10 The other standard: AWWA C207; EN1092-1, GOST12820, JIS B2220; KS B1503, SABS1123; NFE29203; UNI2276 |
| ASME SA182M Stainless Steel 321 / 321H Flange Uses & application | Bitumen upgraders. Heavy oil refineries. Nuclear power (mostly seamless). Petrochemicals and acids. |
| SS 321 / 321H EN 1092-1 Flange Export to | Ireland, Singapore, Indonesia, Ukraine, Saudi & Arabia, Spain, Canada, USA, Brazil, Thailand, Korea, Iran, India, Egypt, Oman, Dubai, Peru, etc |
| Material Test Certificates (MTC) as per EN 10204 3.1 and EN 10204 3.2, Test Certificates certifying NACE MR0103, NACE | |
| ASME/ANSI B 16.5 | Blind Flange, High Hub Blind Flange, Slip on Flange, Welding Neck Flange, Socket Weld Flange, Ring Type Joint Flange, Lap Joint Flange, Threaded Flange |
| PRESSURE CLASS | 150, 300, 400, 600, 900, 1500, 2500 |
| ASME/ANSI B 16.47 | Blind Flange [Series A & B],Welding Neck Flange |
| PRESSURE CLASS | 75, 150, 300, 400, 600, 900 |
| ASME/ANSI B 16.36 | Slip on Flange, Threaded Flange, Welding Neck Flange, |
| PRESSURE CLASS | 300, 400, 600, 900, 1500, 2500 |
| BS 4504 SEC 3.1 | Plate Flange, Loose Plate Flange, Loose Plate With Weld Neck Flange, Blank Flange, Welding Neck Flange, Hubbed Slip on Flange, Hubbed Threaded Flange, Lapped Pipe End Flange, |
| PRESSURE CLASS | PN 2.5 TO PN 40 |
| BS 4504[PART 1] | Plate Flange, Loose Plate With Weld On Plate Collar, Blank Flange, Welding Neck Flange, Hubbed Slip-On Hubbed Threaded, |
| PRESSURE CLASS | PN 2.5 TO PN 400 |
| BS 1560 BOSS | Plate Flange, Loose Plate With Weld On Plate Collar, Blank Flange, Welding Neck Flange, Hubbed Slip-On Hubbed Threaded, |
| PRESSURE CLASS | 150, 300, 400, 600, 900, 1500, 2500 |
| BS10 | Welding Neck Flange, Plate Slip-On Flange, Screwed Boss Flange, Slip-On Boss Flange, Blind Flange |
| TABLE | D, E, F, H |
| DIN FLANGES | DIN 2527, 2566, 2573, 2576, 2641,2642, 2655, 2656, 2627, 2628, 2629, 2631, 2632, 2633, 2634, 2635, 2636, 2637,2638, 2673 |
| PRESSURE CLASS | PN 6 TO PN 100 |
| ASTM A182 SS F321 / 321H Slip-On Flanges | ASTM A182 SS F321 / 321H Threaded Flanges | Sizes 1/8″ – 36″ Raised Face or Flat Face |
| ASTM A182 SS F321 / 321H Weld Neck Flanges | ASTM A182 SS F321 / 321H Socket Weld Flanges | |
| ASTM A182 SS F321 / 321H Blind Flanges | ASTM A182 SS F321 / 321H Reducing Flanges | |
| ASTM A182 SS F321 / 321H Lap Joint Flanges | ASTM A182 SS F321 / 321H Plate Flanges | |
| ASTM A182 SS F321 / 321H Orifice Flanges | ASTM A182 SS F321 / 321H Forged Flanges | |
| ASTM A182 SS F321 / 321H Ring Type Joint Flanges | ASTM A182 SS F321 / 321H Square Flanges |
| STANDARD | WERKSTOFF NR. | UNS | JIS | EN |
| SS 321 | 1.4541 | S32100 | SUS 321 | X6CrNiTi18-10 |
| SS 321H | 1.4878 | S32109 | SUS 321H | X12CrNiTi18-9 |
| Grade | C | Mn | Si | P | S | Cr | N | Ni | Ti |
| SS 321 | 0.08 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 – 19.00 | 0.10 max | 9.00 – 12.00 | 5(C+N) – 0.70 max |
| SS 321H | 0.04 – 0.10 | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 – 19.00 | 0.10 max | 9.00 – 12.00 | 4(C+N) – 0.70 max |
| Grade | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 304 / 304L | 8.0 g/cm3 | 1400 °C (2550 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 35 % |
| American Steel Flanges Standard | |
| Standard Code | Standard Name |
| ANSI ASME SA-182 | Forged Flanges |
| ANSI ASME B16.5 | Slip on flange, Welding neck flange, Blind flange, Threaded flange, Lap joint flange, RTJ flange |
| ASME – B 16.47 | Welding neck flange, Blind flange |
| ASME – B 16.36 | Welding neck flange Slip on flange |
| German Steel Flanges Standard | |
| DIN 2527 | Steel Blind Flanges, BLRF |
| DIN 2573 / 2576 | Flat Flange for Welding (Slip On) |
| DIN 2673 | Loose Flanges and Rings for Welding (Slip On Flanges and Plain Collars) |
| DIN 2641 / 2642 | Lapped / Loose (Lap Joint) Flanges Plain Collars |
| DIN 28115 | Long Neck Welding Flanges |
| DIN PN10, PN16 | SS 321 PN10 Flanges, 321H SS DIN PN 10 Flanges, 321 SS PN16 Flange |
| DIN PN20, PN25 | SS 321 PN20 Flanges, 321H SS DIN PN 25 Flanges |
| DIN PN40, PN50 | SS 321 PN40 Flanges, 321H SS DIN PN 50 Flanges |
| Japanese Steel Flanges Standard | |
| JIS B2220 | Slipon plate flange (SOP), Slipon Hub (SOH), Socket Welding flange (SW), Welding neck flange (WN), Lapjoint (LJ), Threaded flange (TR)/ Itegral flange (IT) Blank flange (BL) |
| JIS B2291 | Slipon plate flange (SOP), Slipon Hub (SOH), Socket Welding flange (SW), Welding neck flange (WN), Lapjoint (LJ), Threaded flange (TR)/ Itegral flange (IT) Blank flange (BL) |
| JIS 5K, 10K | SS 321 5K SORF Flanges, 321H SS 10K SOFF Flanges |
| JIS 16K, 20K | SS 321 16K Blind Flanges, 321H SS 20K BLRF Flanges |
| JIS 30K, 40K | SS 321 30K Slip on Flanges, 321H SS 40K Blind Flanges |
| Italian Flanges Standard | |
| UNI FLANGES | Plan flanges (2276, 2277, 2278, 6083, 6084) Welding neck (2280, 2281, 2282, 2283, 2284, 2285, 2286) Lapped flanges (6088, 6089, 6090, 2999, 2300) Blind flanges (6091, 6092, 6093, 6094, 6095, 6096, 6097) threaded flanges (2253, 2254) |
| British Standard Pipe Flanges Standard | |
| BS 10 Table D | SS 321 BS 10 Table D Flanges, 321H Table D Pipe Flange |
| BS 10 Table E | SS 321 BS 10 Table E Flanges, 321H Table E Pipe Flange |
| BS 10 Table F | SS 321 BS 10 Table E Flanges, 321H Stainless Steel Table E Flanges |
| BS 10 Table H | SS 321 BS 10 Table E Flanges, Stainless Steel 321H Table E Pipe Flanges |
| Flange Schedule/Class | Pipe Size – Pipe Flanges | Flange Connection Type | Flange Material | Max. Pressure |
|---|---|---|---|---|
| ASME B16.5 Class 150 | 1/2″ | FNPT | Stainless Steel 321 / 321H Flanges | 150 psi |
| ASME B16.5 Class 150 | 1/2″ | Socket Weld | Stainless Steel 321 / 321H Flanges | 275 psi |
| ASME B16.5 Class 150 | 1/2″ | Welded | Stainless Steel 321 / 321H Flanges | 150 psi |
| ASME B16.5 Class 150 | 3/4″ | FNPT | Stainless Steel 321 / 321H Flanges | 150 psi |
| ASME B16.5 Class 150 | 3/4″ | Socket Weld | Stainless Steel 321 / 321H Flanges | 275 psi |
| ASME B16.5 Class 150 | 1-1/4″ | Socket Weld | Stainless Steel 321 / 321H Flanges | 275 psi |
| ASME B16.5 Class 150 | 1-1/2″ | Socket Weld | Stainless Steel 321 / 321H Flanges | 275 psi |
| ASME B16.5 Class 150 | 2″ | FNPT | Stainless Steel 321 / 321H Flanges | 150 psi |
| ASME B16.5 Class 150 | 2″ | Socket Weld | Stainless Steel 321 / 321H Flanges | 275 psi |
| ASME B16.5 Class 150 | 2-1/2″ | Socket Weld | Stainless Steel 321 / 321H Flanges | 275 psi |
| ASME B16.5 Class 150 | 3″ | Socket Weld | Stainless Steel 321 / 321H Flanges | 275 psi |
| ASME B16.5 Class 150 | 4″ | FNPT | Stainless Steel 321 / 321H Flanges | 150 psi |
| ASME B16.5 Class 150 | 4″ | Socket Weld | Stainless Steel 321 / 321H Flanges | 275 psi |
| ASME B16.5 Class 300 | 1/2″ | Slip On | Stainless Steel 321 / 321H Flanges | 720 psi |
| ASME B16.5 Class 300 | 1/2″ | Slip On | Stainless Steel 321 / 321H Flanges | 720 psi |
| ASME B16.5 Class 300 | 1″ | Slip On | Stainless Steel 321 / 321H Flanges | 720 psi |
| ASME B16.5 Class 300 | 1″ | Slip On | Stainless Steel 321 / 321H Flanges | 720 psi |
| ASME B16.5 Class 300 | 1-1/4″ | FNPT | Stainless Steel 321 / 321H Flanges | 720 psi |
| ASME B16.5 Class 300 | 1-1/4″ | Slip On | Stainless Steel 321 / 321H Flanges | 720 psi |
| ASME B16.5 Class 300 | 1-1/2″ | Slip On | Stainless Steel 321 / 321H Flanges | 720 psi |
| ASME B16.5 Class 300 | 1-1/2″ | Slip On | Stainless Steel 321 / 321H Flanges | 720 psi |
| ASME B16.5 Class 300 | 2″ | Slip On | Stainless Steel 321 / 321H Flanges | 720 psi |
| ASME B16.5 Class 300 | 2″ | Slip On | Stainless Steel 321 / 321H Flanges | 720 psi |
| ASME B16.5 Class 300 | 2-1/2″ | Slip On | Stainless Steel 321 / 321H Flanges | 720 psi |
| ASME B16.5 Class 300 | 2-1/2″ | Slip On | Stainless Steel 321 / 321H Flanges | 720 psi |
| ASME B16.5 Class 300 | 3″ | Slip On | Stainless Steel 321 / 321H Flanges | 720 psi |
| ASME B16.5 Class 300 | 3″ | Slip On | Stainless Steel 321 / 321H Flanges | 720 psi |
| ASME B16.5 Class 300 | 4″ | Slip On | Stainless Steel 321 / 321H Flanges | 720 psi |
| ASME B16.5 Class 300 | 4″ | Slip On | Stainless Steel 321 / 321H Flanges | 720 psi |
| 321H Stainless Steel Blind Flange | SS 321 Flat Flange Supplier in India |
| Stainless Steel UNS S32100 Flanges Manufacturer | Stainless Steel 321 Slip on Flanges |
| Stainless Steel 321 Weld Neck Flanges | SS 321H Socket weld Flanges Dealer in India |
| SS 321H Long Weld Neck Flanges Stockist | ASTM A182 F321 SS Threaded Flanges |
| Stainless Steel 321 Flanges Supplier in India | Stainless Steel EN 1092-1 Plate Flanges |
| Stainless Steel 321H Forged Flanges Wholesaler | SS UNS S32109 Lap Joint Flanges Supplier |
| Stainless Steel 321 BLRF Flange Manufacturer | Stainless Steel 321 Raised Face Flanges |
| F321 Stainless Steel Nipoflange | Stainless Steel SUS 321 Reducing Flanges |
| ANSI B16.5 Stainless Steel 321 Pipe Flange | SS 321 Ring Type Joint Flanges |
| 1.4541 Stainless Steel Orifice Flange | Stainless Steel 321 Spectacle Blind Flanges Stockists |
| Stainless Steel 321 PN 10 Flange | 321H PN 16 Stainless Steel Flanges Stockists |
| Stainless Steel 321H DIN Flanges | INOX 1.4878 SS SORF Flanges Exporter |
| ASME B16.5 Stainless Steel 321H Flanges | ASTM A182 321 Tongue & Groove Flanges |
| SS 321H Male & Female Flanges | Stainless Steel 321 RTJF Flanges |
| ASTM A182 SS 321H Screwed Flanges | ASME SA182 SS321 Expander Flanges |
| 321H SS Spades Ring Spacers Flanges | ASME SA182 Stainless Steel 321 Flat Face Flange |
| 321H SS 5K SOFF Flanges | Stainless Steel 321 10K Flanges |
| INOX 1.4541 Puddle Flanges Exporter | Stainless Steel 321 Socket Welding Flange |
| Grade 321 Stainless Steel Weldo Flanges | 321H Stainless Steel Nipo Flanges |
| SUS 321 Long Weld Neck Flanges | ASTM A182 F321H Flanges Facing Type & Finish |
| 321 SS BS Standard Table E Flange | SS 321H British Standard Table D Pipe Flanges |
| F321H Long Welding Neck Flange | Grade 321 Stainless Steel Raised Face Flange |
| ASME SA182 Stainless Steel 321 Spectacle Blind Flanges | 321H Stainless Steel BLRF Flanges Supplier |
| Stainless Steel 321 High Hub Blinds Flanges | F321H Flanges Facing Type & Finish |
| X6CrNiTi18-10 SS Forging Facing Flanges Dealer | Stainless Steel 321 Weld Neck Flanges A / B Stockist |
| Stainless Steel 321 Plate Flange Supplier in Mumbai | SS 321H Loose Flanges Manufacturer in India |
| Stainless Steel 1.4878 Flanges Dimensions | Stainless Steel 321H Spades Ring Spacers Flanges |
| Wrought Austenitic Stainless Steel 321 Flanges | ASTM A182 F321 Expander Flanges at Best Price |
| SS X12CrNiTi18-9 Reducing Flanges Supplier | Suppliers of 321H Stainless Steel Welding Neck Flange |
Stainless Steel 321 / 321H Flanges are available in pipe or plate construction and are manufactured according to recognized industry standards. These flanges are generally supplied as per ASTM A182 material specifications and ASME B16.5 dimensional requirements, providing dependable dimensional accuracy, material quality, and compatibility with a wide range of industrial piping systems.






We offer Stainless Steel 321 / 321H Flanges in accordance with international standards such as DIN, ISO, JIS, and ANSI, allowing them to meet the varied requirements of industrial piping systems. Our flanges are supplied in different sizes, dimensions, pressure classes, and configurations to suit specific project needs. At Jai Hind Metal, we emphasize dependable quality, dimensional consistency, and reliable performance while supplying SS 321 / 321H Flanges according to applicable standards and customer specifications. For product details, specifications, or customized requirements, email us at info@jaihindmetal.com.
Stainless Steel 321 / 321H Flanges are commonly used to create secure connections between pipes, valves, pumps, and other components in industrial piping systems. Their excellent resistance to oxidation, corrosion, and elevated temperatures makes them suitable for applications where piping equipment is exposed to continuous heat. These flanges are widely used in chemical processing, petrochemical plants, oil and gas, power generation, heat exchangers, thermal processing equipment, aerospace applications, and high-temperature industrial piping systems. Grade 321H is particularly suitable for services requiring enhanced strength at elevated temperatures.
Looking for high-quality industrial products manufactured to your specific requirements? Contact our team for product details, customized solutions, pricing, and timely delivery.
Email: info@jaihindmetal.com
Our high-performance metal products are engineered to meet the demanding requirements of industries operating in challenging environments, including extreme temperatures, pressure and corrosive conditions.
Our corrosion-resistant metal products are widely used in marine environments where exposure to seawater, salt spray and harsh atmospheric conditions demands exceptional durability and reliability.
Our nickel alloys and high-performance metal products are used throughout the oil and gas industry for demanding applications involving high pressure, corrosive fluids, sour gas and extreme operating conditions.
Our corrosion-resistant alloys provide dependable performance in chemical processing equipment exposed to aggressive chemicals, high temperatures and challenging process conditions.
High-strength nickel alloys and specialty metals are selected for aerospace applications where lightweight performance, strength and resistance to extreme temperatures are essential.
Our specialty metal products support power generation equipment operating under high temperatures, pressure and corrosive conditions, delivering reliable long-term performance.
Corrosion-resistant metals are ideal for salt production environments where continuous exposure to concentrated salt and moisture can severely affect conventional materials.
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