Harsh Metalloys is a renowned manufacturer and supplier of Stainless Steel 321H Flanges based in Mumbai, India, serving diverse industries with reliable and high-performance flange solutions. SS 321H is a titanium-stabilized austenitic stainless steel grade with higher carbon content, specifically designed for enhanced high-temperature strength and resistance to intergranular corrosion. These flanges are ideal for applications requiring superior heat resistance and structural integrity. Available in various types such as weld neck, slip-on, blind, socket weld, and threaded flanges, our SS 321H flanges are manufactured to meet international standards like ASTM A182 and are offered in both standard and custom specifications.
Stainless Steel 321H Flanges are composed of 17–19% chromium, 9–12% nickel, and increased carbon content (0.04–0.10%) for improved high-temperature strength. Titanium content helps prevent carbide precipitation during welding and heat treatment, maintaining corrosion resistance. These flanges offer a minimum tensile strength of 515 MPa and yield strength of 205 MPa, along with excellent creep and stress rupture properties at elevated temperatures. SS 321H flanges exhibit excellent weldability, machinability, and resistance to oxidation, making them highly reliable for continuous operation in heat-intensive environments.
| Specifications | ASTM A182 / ASME SA182 |
| Size | 1/8″ NB TO 48″ NB |
| Standards | ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc. |
| Class / Pressure | 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc. |
| Standard | ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, etc. |
| Grades | S31803 / S32205 A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61 |
| Grade | C | Mn | Si | P | S | Cr | N | Ni | Ti | 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 |
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 8.0 g/cm3 | 1457 °C (2650 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 35 % |
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We offers the best quality Stainless Steel 321H Flanges Harsh Metalloys,which has undergone intense testing to produce top quality and performance. The flange is thoroughly tested for meeting international standards and specifications. Products supplied by us are certified by recognized authorities for traceability and reliability in each batch. With modern technology and strict quality control, we ensure durability, corrosion resistance, and good mechanical properties. Harsh Metalloys stands by the delivery of flanges with the highest level of industry standards in functionality and safety.
Stainless Steel 321H Threaded Flanges are available in sizes ranging from 1/2″ to 24″ and are designed for easy assembly without welding. They offer good resistance to oxidation and corrosion, making them suitable for various industrial applications.
SS 321H Socket Weld Flanges, ranging from 1/2″ to 24″ in size, are designed to fit inside a pipe for strong, reliable connections. They provide excellent resistance to high-temperature environments and corrosive substances.
Stainless Steel 321H Lap Joint Flanges are available in sizes from 1/2″ to 24″ and are used with a backing flange to allow for easy alignment and assembly. They offer high resistance to oxidation and corrosive elements, ideal for applications with frequent disassembly.
Stainless Steel 321H Flanges are widely used in high-temperature and pressure applications across various industries such as petrochemical, oil and gas, power generation, aerospace, and marine engineering. Common applications include heat exchangers, furnace components, exhaust manifolds, high-pressure piping systems, and chemical processing equipment. These flanges provide leak-proof, durable, and corrosion-resistant joints in systems subjected to thermal cycling and aggressive environments. Harsh Metalloys supplies SS 321H flanges in a range of sizes and pressure ratings, customized to client requirements, ensuring dependable performance and compliance with international quality standards.
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