Stainless Steel 321H Bars are a class of high-temperature austenitic stainless steel bars stabilized with titanium and further strengthened with higher carbon content for better creep strength. 321H is supplied by Andre Stainless Pulau Ujong, Singapore. It is ideally placed for high-temperature and high-pressure application in petrochemical, power generation, and refinery industries. The titanium addition stabilizes the material against intergranular corrosion following welding or long exposure to heat. 321H bars retain their strength in service conditions where temperatures are above 538°C and are suitable for pressure vessels and heat exchanger tube. Andre Stainless provides precision-rolled and heat-treated ASTM A276 and A479 compliant 321H bars.
SS 321H has ~17–19% chromium, ~9–12% nickel, ~0.04–0.10% carbon, and titanium ≥5x the content of carbon to prevent carbide precipitation. It provides tensile strength of about 550 MPa, yield strength ~240 MPa, elongation of ~35%, and hardness of ~150 HB. 321H is not magnetic in the annealed condition and maintains mechanical strength at higher temperatures, resisting oxidation to ~870°C. The high carbon level has improved high-temperature creep properties over standard SS 321, with titanium providing superior weldability and post-weld stability when thermal cycling is encountered.
| 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 | 0.04 – 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 % |
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Stainless Steel 321H Round Bars are designed for high-temperature applications, offering excellent oxidation resistance and mechanical strength. Ideal for use in aerospace, chemical processing, and high-temperature industrial components where durability and resistance to thermal degradation are crucial.
Stainless Steel 321H Flat Bars provide superior strength and resistance to high temperatures and oxidation. Suitable for manufacturing structural components, heat exchangers, and exhaust systems, these bars are used in industries where high performance under extreme conditions is required.
Stainless Steel 321H Square Bars are engineered for high-stress, high-temperature environments. They are commonly used in aerospace, petrochemical, and power generation industries for components such as reactor vessels, furnace parts, and structural supports due to their excellent thermal stability and strength.
Stainless Steel 321H Rectangular Bars offer high resistance to thermal and oxidation damage, making them suitable for high-temperature applications like furnace components, chemical processing equipment, and structural supports in demanding environments.
Stainless Steel 321H Hexagonal Bars provide exceptional strength and thermal stability, ideal for use in high-temperature applications such as gas turbines, exhaust systems, and chemical processing equipment. Their resistance to carbide precipitation ensures durability under extreme conditions.
Stainless Steel 321H T-Bars are utilized in high-temperature and high-stress environments, offering excellent strength and resistance to oxidation. They are commonly used in structural applications, including supports and frames in the aerospace, chemical processing, and energy sectors.
Stainless Steel 321H Bars are most commonly utilized in high-temperature and pressure service conditions such as petroleum refineries, chemical processing, superheaters, and steam piping. They find suitable applications in welded pressure vessels, expansion joints, exhaust manifolds, and aircraft engine parts subject to thermal cycling. Their titanium stabilization and increased content of carbon make them readily applicable in creep resistant applications, oxidation protection, and intergranular corrosion resistance applications. 321H bars are also used in heat exchanger tubes, boiler shells, and furnace parts where resistance to continuous heat and retention of strength are crucial. They provide a secure solution in weld-intensive applications with long-term thermal performance requirements.
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