Rupal Metals, located in Delhi, India, has built a solid reputation as a manufacturer and supplier of top-notch stainless steel products, including the premium Stainless Steel 321H Hollow Bar. Designed to withstand high temperatures and stress, our 321H hollow bars are highly regarded for their superior creep resistance and durability. We utilize cutting-edge techniques and rigorous quality controls to ensure our products meet global industrial standards. At Rupal Metals, we pride ourselves on delivering consistent quality, competitive pricing, and dependable service, making us a trusted partner for industries like petrochemical, aerospace, power generation, and fabrication both in India and abroad.
Stainless Steel 321H Hollow Bar is a high-carbon variant of 321 stainless steel, primarily made up of 17–19% chromium, 9–12% nickel, and titanium for stabilization. With a higher carbon content (up to 0.10%), it boasts improved strength at high temperatures. This alloy is known for its excellent oxidation resistance and creep strength in environments reaching up to 900°C. It offers a tensile strength of about 515 MPa and a yield strength of roughly 205 MPa, along with good ductility and formability. Stainless Steel 321H maintains its mechanical integrity under pressure and thermal cycling, making it perfect for heat-intensive applications.
| 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 Bar finds extensive use in industries where high-temperature and corrosion resistance are crucial. It’s perfect for heat exchangers, pressure vessels, refineries, boilers, and exhaust manifolds. Thanks to its enhanced creep strength, it’s well-suited for continuous operation in elevated temperature settings like power plants and petrochemical processing units. The hollow design not only saves weight but also offers design flexibility, making it a popular choice for structural components in aerospace, chemical processing, and marine applications. Its excellent weldability and long-term performance further enhance its appeal.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Rupal Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Delhi, India
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