Home > Forged Fittings > Stainless Steel 321/321H Forged Fittings
Nakamura Stainless, based in Pulau Ujong, Singapore, is a reliable manufacturer and supplier of high-quality stainless steel products, including stainless steel 321 and 321H forged fittings. These fittings are designed for high-temperature applications and provide excellent resistance to oxidation and intergranular corrosion. Stabilized with titanium, stainless steel 321 and its high-carbon variant 321H prevent carbide precipitation during welding and long heat exposure. Nakamura Stainless focuses on precision forging and strict quality control, ensuring durable and dependable fittings for demanding industries such as petrochemical, power generation, aerospace, and chemical processing.
Stainless steel 321/321H forged fittings come from an austenitic stainless steel alloy containing 17 to 19% chromium, 9 to 13% nickel, and titanium for stabilization. The 321H grade features a higher carbon content, which improves high-temperature strength and creep resistance. These fittings offer tensile strength between 520 and 750 megapascals and maintain their properties at temperatures up to 900°C. Titanium stabilization prevents intergranular corrosion, which ensures durability and performance in welded or high-heat environments.
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 % |
Contact us to get a quick quote for your requirement.
At Nakamura Stainless, each stainless steel 321/321H forged fitting undergoes rigorous testing for excellent quality and performance. Our products are certified to meet international standards, including ISO and ASTM. Tests include material authentication, water testing and non-destructive analysis to ensure durability, reliability and compliance for critical industrial applications around the world.
These fittings, available in sizes from 1/8″ to 4″, are 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.
Threaded fittings in 321 stainless steel 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.
This 45-degree elbow, available from 1/2″ to 4″, is 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.
The threaded tee, with sizes from 1/8″ to 6″, 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.
The socket weld cross, 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.
Stainless steel 321/321H forged fittings find wide use in applications that need high strength, thermal stability, and corrosion resistance at elevated temperatures. They are often used in piping systems, heat exchangers, boilers, furnace components, and exhaust systems within the petrochemical, power generation, and aerospace industries. Their great weldability and resistance to thermal fatigue make them suitable for welded assemblies and equipment subject to thermal cycling, providing safe and long-lasting connections in critical, high-temperature environments.
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