Louis Metals, a reliable stainless steel supplier and manufacturer located in Houston, USA, proudly offers high-quality Stainless Steel 321H Hollow Bars, perfect for high-temperature and high-pressure applications. This high-carbon, titanium-stabilized austenitic stainless steel is known for its outstanding resistance to oxidation, intergranular corrosion, and stress rupture. Our 321H hollow bars are crafted to meet strict tolerances and comply with ASTM and ASME standards, making them ideal for industries like power generation, oil & gas, and chemical processing. At Louis Metals, we deliver precision-engineered 321H hollow bar solutions that are built to last.
Stainless Steel 321H Hollow Bar consists of 17–19% chromium, 9–12% nickel, and titanium (at least five times the carbon content) for stabilization. The “H” variant features a higher carbon content (0.04–0.10%) to enhance strength and creep resistance at elevated temperatures. It boasts a tensile strength ranging from 515 to 750 MPa, a yield strength of about 205 MPa, and a Brinell hardness of 150–200 HB. 321H maintains its structural integrity and resists scaling at temperatures up to 900°C (1652°F), making it perfect for high-heat environments. It also offers excellent weldability and stability during prolonged thermal exposure.
| 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 |
Stainless Steel 321H Hollow Bars find extensive use in high-temperature applications across various sectors, including petrochemical, aerospace, thermal processing, and power generation. Common applications include components for superheaters, exhaust manifolds, heat exchangers, steam lines, and refinery piping systems. Thanks to its enhanced creep resistance and ability to endure thermal cycling, 321H is ideal for structural and pressure-bearing components exposed to sustained heat. Additionally, its hollow design contributes to reduced weight and cost savings during fabrication. Louis Metals is committed to providing top-notch solutions tailored to meet the demands of these industries.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Louis Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Houston, USA
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