Teerasil Fittings and Plates, Bangkok, Thailand, is a reliable manufacturer and supplier of **321/321H Stainless Steel forged fittings**, suitable for high-temperature and corrosive service applications. They are produced in titanium-stabilized austenitic stainless steel with high resistance to corrosion and oxidation intergranular. Stainless Steel 321 is particularly suited for continuous service at temperatures up to 900°C, while the high-carbon version, 321H, offers higher strength and creep resistance at high temperatures. Produced to the specifications of ASTM A182 and other international specifications, Teerasil supplies robust, accurately engineered forged fittings for use in petrochemical, aerospace, and heat exchanger applications.
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)
Stainless Steel 321/321H forged fittings have about 17–19% chromium, 9–12% nickel, and are stabilized by titanium (at least 5 times carbon content) to avoid carbide precipitation. 321H contains more carbon (0.04–0.10%) than 321, which adds to high-temperature strength. These forged fittings provide tensile strength of about 515 MPa and yield strength of about 205 MPa. Forging enhances their pressure-handling ability and grain structure, making them suitable for high-temperature, high-stress environments where corrosion and scaling resistance is crucial.
| 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 % |
Teerasil Fittings is a leading supplier of Stainless Steel 321/321H Forged Fittings in Bangkok, Thailand. We offer an extensive range of Stainless Steel 321/321H Forged Fittings, renowned for their excellent corrosion resistance and high strength, which makes them perfect for demanding industrial applications like chemical processing, marine environments, and high-temperature systems. With a commitment to quality and reliable delivery, we ensure our clients receive top-tier products tailored to meet the specific needs of various industries.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
| STANDARD | WERKSTOFF NR. | UNS | JIS | EN |
| SS 321 | 1.4541 | S32100 | SUS 321 | X6CrNiTi18-10 |
| SS 321H | 1.4878 | S32109 | SUS 321H | X12CrNiTi18-9 |
Choose Stainless Steel 321/321H Forged Fittings from Teerasil Fittings for superior quality, exceptional corrosion resistance, and reliable performance in extreme conditions. We offer customized solutions backed by expert support and industry experience.
Stainless steel 321/321H forged fittings offer many advantages, including resistance to high temperature oxidation and corrosion, making them ideal for use in high-temperature environments The addition of titanium stabilizes the material, especially prevents sensitivity and intergranular corrosion in welds. These fittings have excellent strength, high tensile and yield characteristics, and excellent formability, ensuring durability and long-term performance in critical applications Stainless steel 321H, with a high carbon content of 1,000. for higher strength at higher temperatures. Overall, they are highly reliable in the petroleum, aerospace, and power sectors.
Yes, custom sizes for Stainless Steel 321/321H Forged Fittings are available at Teerasil Fittings. We offer tailored solutions to meet your specific requirements, ensuring optimal performance for your projects. For more information, please contact us at sales@teerasilfittings.com
| Fitting Schedule/Class | Pipe Size – Pipe Fitting | Fitting Connection Type | Pipe Fitting Material | Max. Pressure |
|---|---|---|---|---|
| Class 150 | 1/2″ | FNPT | Stainless Steel 321 | 150 psi |
| Class 150 | 1/2″ | FNPT | Stainless Steel 321 | 150 psi |
| Class 150 | 1/2″ | Forged | Forged Stainless Steel 321 | 275 psi |
| Class 150 | 1/2″ | Welded | Stainless Steel 321 | 150 psi |
| Class 150 | 3/4″ | FNPT | Stainless Steel 321 | 150 psi |
| Class 150 | 3/4″ | FNPT | Stainless Steel 321 | 150 psi |
| Class 150 | 3/4″ | Forged | Forged Stainless Steel 321 | 275 psi |
| Class 150 | 3/4″ | Welded | Stainless Steel 321 | 150 psi |
| Class 150 | 3/4″ | Welded | Stainless Steel 321 | 150 psi |
| Class 150 | 1″ | FNPT | Stainless Steel 321 | 150 psi |
| Class 150 | 1″ | FNPT | Stainless Steel 321 | 150 psi |
| Class 150 | 1″ | Forged | Forged Stainless Steel 321 | 275 psi |
| Class 150 | 1″ | Welded | Stainless Steel 321H | 150 psi |
| Class 150 | 1″ | Welded | Stainless Steel 321 | 150 psi |
| Class 150 | 1-1/4″ | FNPT | Stainless Steel 321 | 150 psi |
| Class 150 | 1-1/4″ | FNPT | Stainless Steel 321 | 150 psi |
| Class 150 | 1-1/4″ | Forged | Forged Stainless Steel 321 | 275 psi |
| Class 150 | 1-1/4″ | Welded | Stainless Steel 321H | 150 psi |
| Class 150 | 1-1/4″ | Welded | Stainless Steel 321H | 150 psi |
| Class 150 | 1-1/2″ | FNPT | Stainless Steel 321 | 150 psi |
| Class 150 | 1-1/2″ | FNPT | Stainless Steel 321 | 150 psi |
| Class 150 | 1-1/2″ | Forged | Forged Stainless Steel 321H | 275 psi |
| Class 150 | 1-1/2″ | Welded | Stainless Steel 321H | 150 psi |
| Class 150 | 1-1/2″ | Welded | Stainless Steel 321 | 150 psi |
| Class 150 | 2″ | FNPT | Stainless Steel 321 | 150 psi |
| Class 150 | 2″ | FNPT | Stainless Steel 321 | 150 psi |
| Class 150 | 2″ | Forged | Forged Stainless Steel 321H | 275 psi |
| Class 150 | 2″ | Welded | Stainless Steel 321 | 150 psi |
| Class 150 | 2″ | Welded | Stainless Steel 321 | 150 psi |
| Class 150 | 2-1/2″ | FNPT | Stainless Steel 321 | 150 psi |
| Class 150 | 2-1/2″ | FNPT | Stainless Steel 321 | 150 psi |
| Class 150 | 2-1/2″ | Forged | Forged Stainless Steel 321 | 275 psi |
| Class 150 | 2-1/2″ | Welded | Stainless Steel 321H | 150 psi |
| Class 150 | 2-1/2″ | Welded | Stainless Steel 321 | 150 psi |
| Class 150 | 3″ | FNPT | Stainless Steel 321 | 150 psi |
| Class 150 | 3″ | FNPT | Stainless Steel 321 | 150 psi |
| Class 150 | 3″ | Forged | Forged Stainless Steel 321H | 275 psi |
| Class 150 | 3″ | Welded | Stainless Steel 321 | 150 psi |
| Class 150 | 4″ | FNPT | Stainless Steel 321 | 150 psi |
| Class 150 | 4″ | FNPT | Stainless Steel 321 | 150 psi |
| Class 150 | 4″ | Forged | Forged Stainless Steel 321H | 275 psi |
| Class 150 | 4″ | Welded | Stainless Steel 321 | 150 psi |
| Class 150 | 4″ | Welded | Stainless Steel 321 | 150 psi |
| Class 150 | 6″ | FNPT | Stainless Steel 321 | 150 psi |
| Class 150 | 6″ | FNPT | Stainless Steel 321 | 150 psi |
| Class 150 | 6″ | Welded | Stainless Steel 321H | 150 psi |
| Class 150 | 6″ | Welded | Stainless Steel 321 | 150 psi |
| DN-NPT | MAJOR DIAMETER MM | TAPPING DRILL SIZE MM | TPI | PITCH MM |
|---|---|---|---|---|
| 1/16″ | 7.895 | 6.00 | 27 | 0.941 |
| 1/8″ | 10.242 | 8.25 | 27 | 0.941 |
| 1/4″ | 13.616 | 10.70 | 18 | 1.411 |
| 3/8″ | 17.055 | 14.10 | 18 | 1.411 |
| 1/2″ | 21.223 | 17.40 | 14 | 1.814 |
| 3/4″ | 26.568 | 22.60 | 14 | 1.814 |
| 1″ | 33.228 | 28.50 | 11.5 | 2.209 |
| 1¼” | 41.985 | 37.00 | 11.5 | 2.209 |
| 1½” | 48.054 | 43.50 | 11.5 | 2.209 |
| 2″ | 60.092 | 55.00 | 11.5 | 2.209 |
| 2½” | 72.699 | 65.50 | 8 | 3.175 |
| 3″ | 88.608 | 81.50 | 8 | 3.175 |
| 3½” | 101.316 | 94.30 | 8 | 3.175 |
| 4″ | 113.973 | 107.00 | 8 | 3.175 |
| 5″ | 141.300 | 134.384 | 8 | 3.175 |
| 6″ | 168.275 | 161.191 | 8 | 3.175 |
| 8″ | 219.075 | 211.673 | 8 | 3.175 |
| 10″ | 273.050 | 265.311 | 8 | 3.175 |
| 12″ | 323.850 | 315.793 | 8 | 3.175 |
Forged fittings of Stainless Steel 321/321H are applied in the majority of industries where high-temperature strength and corrosion resistance are necessary. In the petroleum and oil and gas sectors, they are utilized in reformers, manifolds, and catalytic crackers. They function as boiler tubes and superheater headers in power plants. Aerospace and aircraft exhaust systems utilize them due to their thermal resistance. They are applicable to chemical processing, furnace parts, and thermal oxidizers. The forged fittings guarantee long-term durability, dimensional stability, and consistent performance in thermal cycling and corrosive environments.
Get in touch with one of our Technical Sales Representatives to request a quote or get answers to any questions you may have.
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