Hemi Metals, located in Hamilton, New Zealand, is a reliable manufacturer and supplier of high-quality Stainless Steel 321H Hollow Bars, specifically designed for demanding industrial applications that require high temperatures and pressure. SS 321H is a titanium-stabilized, high-carbon austenitic stainless steel, crafted for exceptional strength and thermal stability even in elevated temperatures. With a focus on precise dimensions, consistent wall thickness, and rigorous quality control, these hollow bars ensure outstanding mechanical reliability and a long lifespan. Hemi Metals provides SS 321H hollow bars to industries like power generation, petrochemical, refinery, and heavy engineering, where high-temperature strength and corrosion resistance are crucial.
Stainless Steel 321H is made up of about 17–19% chromium and 9–12% nickel, featuring a higher carbon content than SS 321, along with titanium stabilization to avoid carbide precipitation at high temperatures. This unique composition offers remarkable resistance to intergranular corrosion and significantly boosts high-temperature strength. Typically, SS 321H hollow bars exhibit tensile strength ranging from 515–620 MPa and yield strength around 205–240 MPa, while also providing good ductility and creep resistance. These hollow bars are non-magnetic when annealed and maintain stable mechanical performance even after prolonged exposure to high temperatures.
| 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.
Stainless Steel 321H Hollow Bars are extensively utilized in environments that demand both high strength and corrosion resistance, especially under high temperatures and pressure. You’ll find them in applications like boiler tubes, heat exchanger components, superheater assemblies, exhaust systems, and thermal processing equipment. In the petrochemical and power generation sectors, SS 321H hollow bars are essential for pressure vessels, pipelines, expansion joints, and structural tubular supports. They’re also used in refinery systems, gas processing units, and aerospace thermal assemblies, showcasing their versatility and reliability in critical applications.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Hemi Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Hamilton New Zealand
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