Home > Forged Fittings > Stainless Steel 321/321H Forged Fittings
Weston Stainless, which is a UK-based Midland company, is a top supplier of premium stainless steel products that supply rugged and precision-crafted solutions to numerous applications in the industrial sector. Their Stainless Steel 321/321H Forged Fittings are constructed from titanium-stabilized austenitic stainless steel, providing excellent intergranular corrosion resistance and high-temperature oxidation resistance. These fittings come in various shapes such as elbows, tees, couplings, unions, and reducers to create tight and efficient piping connections. SS 321 offers better oxidation resistance, while SS 321H, which contains more carbon, offers improved strength and creep resistance, so that these forged fittings are perfectly suited for harsh industrial applications.
The Stainless Steel 321/321H Forged Fittings consist of 17-19% chromium, 9-12% nickel, and titanium for added stability. SS 321H contains increased carbon content (0.04-0.10%) for improved high-temperature strength. These fittings possess a tensile strength of 515 MPa, yield strength of 205 MPa, and elongation of 40%. Their hardness is around 95 HRB. Physically, they possess a density of 7.9 g/cm³, melting point of 1400°C, and thermal conductivity of 16.3 W/m-K, which makes them perform superbly under extreme conditions.
Specifications ASTM A182 & ASME SA182
Standard ASME 16.11, MSS SP-79, 83, 95, 97, BS 3799
Size 1/8” NB to 4” NB (Socketweld & Screwed-Threaded)
Class 2000 LBS, 3000 LBS, 6000 LBS, 9000 LBS
Type Socketweld Fittings, Screwed-Threaded Fittings
Forged Fittings Items : 45 Deg Elbow, 90 Deg Elbow, Forged Tee, Union, Full Coupling, Half Coupling, Cross, Cap, Swage Nipple, Plug, Bush, Welding Boss, Hexagonal Nipple etc.
Type Socketweld Fittings, Screwed-Threaded Fittings
Grade 321 / 321H UNS (S32100, S32109), DIN (1.4541, 1.4878)
| 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 |
| 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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Stainless Steel 321/321H Forged Fittings find large-scale applications across industries like petrochemical, power generation, aerospace, and marine engineering. They possess the required high-temperature strength necessary for application in heat exchangers, boiler fittings, exhaust systems, and furnace equipment. The fittings find application in chemical processing plants, pressure vessels, and refineries where aggressive conditions and high temperature are prevalent. Their mechanical stability, corrosion resistance, and durability make them the choice for applications in critical piping.
Designed for high-pressure applications with socket weld connections. They offer excellent resistance to oxidation and corrosion due to their high chromium and nickel content. Ideal for elevated temperature environments.
Come in sizes ranging from 1/8″ to 6″. They provide superior resistance to intergranular corrosion, making them suitable for high-temperature and pressure applications. The threaded design ensures a secure, leak-proof connection.
Used to change the direction of piping. It maintains high corrosion resistance and strength under elevated temperatures, making it suitable for critical, high-stress applications.
Allows for branch connections at a 90-degree angle. It is designed for high resistance to heat and corrosive environments, ensuring reliability and durability in demanding conditions.
Available in sizes ranging from 1/8″ to 4″, this half coupling provides a secure connection between two pipes. It is crafted to withstand oxidation and corrosion, making it ideal for high-temperature applications.
Available from 1/2″ to 4″, connects four pipes at right angles. It features high resistance to thermal and chemical stresses, ensuring long-lasting performance in extreme conditions.
Weston Stainless offers test certificates, such as Mill Test Certificates (MTC) according to EN 10204 3.1, to comply with international standards. The fittings are carefully packed in wooden crates, bubble wrap, or carton boxes to avoid damage during shipping. Weston Stainless has a sound supply chain and efficient logistics network to provide timely and safe global delivery, satisfying urgent industrial needs.
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