Chung Metal offers Stainless Steel 321H Hollow Bars, a titanium‑stabilized austenitic grade for use in sustained high temperature service. 321H takes the advantages of 321 and incorporates higher carbon for improved creep strength at high temperatures. Our hollow bars are produced to accurate chemistry, finish, and qualified quality. They are suitable for piping, exhaust components, and heat‑exposed structural components in chemical, petrochemical, aerospace and industrial furnace industries. Weight optimization and fabrication ease are improved with the hollow configuration.
SS 321H (UNS S32109) contains ~17‑19% chromium, ~9‑12% nickel, titanium as stabilizer for carbon, and increased carbon than 321 (≈0.04‑0.10%). Minor elements (Mn, Si). Provides tensile ~620‑725 MPa, yield ~275‑380 MPa, elongation ~30‑40%, superior oxidation resistance to ~816°C, good low‑temperature toughness. Increased carbon enhances strength at high temperature and creep resistance. Hollow structure provides favorable strength per weight ratios.
| Standard | ASTM A276 / A479, ASME SA276 / A479 |
| Round Bar Size | 3mm~ 800mm |
| Square Bar Size | 4mm* 4mm ~100mm* 100mm |
| Flat Bar Size | 2mm ~ 100mm |
| Hex Bar Size | 2mm ~ 100mm |
| Angle Size | 3mm* 20mm* 20mm~ 12mm* 100mm* 100mm |
| Thickness | 50 mm to 6000 mm Long |
| Length | 1 To 6 Meters, Custom Cut Length |
| Form | Round, Square, Hex(A/F), Rectangle, Billet, Ingot, Forging Etc |
| Grade | C | Mn | Si | P | S | Cr | N | Ni | Ti |
| SS 321h | 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 |
| 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 % |
| Denstiy lbm/in3 | Coefficient of Thermal Expansion (min/in)-°F | Thermal Conductivity BTU/hr-ft-°F | Specific Heat BTU/lbm -°F | Modules of Elasticity (annealed)2-psi | |
|---|---|---|---|---|---|
| at 68 °F | at 68 – 212°F | at 68 – 1832°F | at 200°F | at 32 – 212°F | in tension (E) |
| 0.286 | 9.2 | 20.5 | 9.3 | 0.12 | 28 x 106 |
SS 321H hollow bars are widely used in industries like aerospace, petrochemical, power generation, and chemical processing. They are preferred for high-temperature applications due to their excellent thermal stability, oxidation resistance, and resistance to stress-induced cracking at elevated temperatures.
SS 321H hollow bars are typically available in diameters ranging from 25mm to 500mm, with tolerances conforming to ASTM or ISO standards. Common surface finishes include annealed, pickled, and polished, catering to various industrial and aesthetic requirements.
321H Hollow Bars find application in high temperature exhaust systems, expansion joints, chemical reactor piping, furnace tubes, and heat exchangers. They are suitable for applications requiring resistance to intergranular corrosion and oxidation at high temperature, particularly where cyclic heating occurs. In petrochemical processing, environment exposed to hot chlorides or combustion gases, they work well. Also finds application in aerospace, boiler plant equipment, and industrial furnace supports. Hollow structure assists in light frames, pipe carrying supports, and structural parts where weight is a consideration but strength is needed.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Chung Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Da Nang, Vietnam
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