High-quality Stainless Steel 321/321H Forged Fittings for high-temperature and high-pressure applications are the speciality of Harry Fittings, a renowned manufacturer and supplier with headquarters in Houston, USA. While 321H is a high-carbon version that offers enhanced creep strength and durability at higher temperatures, SS 321 is stabilised with titanium and offers exceptional resistance to intergranular corrosion. According to ASTM A182 standards, these forged fittings, which include elbows, tees, unions, couplings, and plugs, are manufactured under stringent quality controls. For dependable use in demanding industries like petrochemicals, refineries, and aerospace, Vipul guarantees consistent dimensional accuracy and superior mechanical integrity.
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)
Vipul Pipes and Tubes’ stainless steel 321/321H forged fittings are composed of nickel (9–12%), chromium (17–19%), and titanium (≥5x C content) to improve resistance to carbide precipitation during welding. For improved high-temperature strength, the 321H grade has more carbon (0.04–0.10%). Tensile strength ≥515 MPa, yield strength ≥205 MPa, and elongation ≥30% are all displayed by these forged fittings. Up to 870°C (1600°F) is the perfect temperature for them to operate continuously. Even in the face of harsh process conditions or heat cycling, the forged structure guarantees high pressure resistance and structural dependability.
| 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 % |
Harry Fittings is a leading supplier of Stainless Steel 321/321H Forged Fittings in Houston, USA. 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 Harry 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 Harry Fittings. We offer tailored solutions to meet your specific requirements, ensuring optimal performance for your projects. For more information, please contact us at sales@harryfittings.us
| 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 |
Chemical plants, refineries, aerospace engines, furnace parts, exhaust manifolds and thermal processing systems all make extensive use of the stainless steel 321/321H forged fittings from Vipul Pipes and Tubes. These fittings are perfect for uses that call for thermal stability, oxidation resistance, and welded assemblies. Whereas SS 321H is favoured when greater creep strength is needed, SS 321 is especially well-suited for systems subjected to oxidising conditions and sporadic heat. Heat exchanger lines, flue gas systems, and steam pipelines are examples of common installations. They are a robust option for long-term industrial use because of their superior mechanical and corrosion-resistant qualities.
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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