Harsh Metalloys, a well-respected manufacturer and supplier located in Mumbai, India, specializes in top-quality Stainless Steel 321H Bars that are perfect for high-temperature and high-pressure applications. SS 321H is a high-carbon variant of the stabilized austenitic stainless steel 321, which means it boasts improved creep strength and better performance in elevated temperatures. These bars are crafted in accordance with ASTM A276/A479 standards and find extensive use in thermal processing, as well as in the chemical and petrochemical sectors. With outstanding resistance to oxidation and intergranular corrosion, Stainless Steel 321H bars deliver reliable performance in tough industrial settings, especially in welded structures that face intense heat and harsh chemicals.
When it comes to composition and mechanical properties, Stainless Steel 321H Bars consist of 17–19% Chromium, 9–12% Nickel, Titanium (≥5xC), and a higher carbon content (up to 0.10%) compared to standard 321, which enhances their high-temperature strength. These bars demonstrate a tensile strength ranging from 515 to 750 MPa and a yield strength of about 205 MPa, along with good elongation and creep resistance. In their annealed state, SS 321H is non-magnetic and maintains structural integrity up to 870°C. It also offers excellent resistance to oxidation, welding sensitization, and intergranular corrosion, making it an ideal choice for continuous high-heat 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 | 0.04 – 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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At Harsh Metalloys, Our stainless steel 321H poles undergo rigorous testing, including tensile, hardness and chemical analysis to ensure they meet international standards. Each product incorporates certifications such as ISO, ASTM, and mill test reports, providing reliability, durability and performance for a variety of industrial applications
SS 321H round bars are known for their impressive high-temperature strength and resistance to creep, making them perfect for applications like pressure vessels, heat exchangers, and other high-heat structural components.
These flat bars excel in thermal stability and weldability, making them a go-to choice in industries such as aerospace, chemical processing, and for furnace parts that operate under elevated temperatures.
SS 321H square bars are both corrosion and heat-resistant, making them ideal for support structures, brackets, and frames in high-temperature industrial settings.
Rectangular bars made from 321H stainless steel are commonly used in thermal processing equipment and petrochemical systems that require high resistance to creep and stress rupture.
Hex bars crafted from SS 321H provide both precision and strength, and they are widely utilized in fasteners, valve components, and various high-temperature mechanical assemblies.
321H T-bars are designed to offer strength and oxidation resistance, making them suitable for load-bearing frameworks and structural reinforcements in high-heat, corrosive environments like power generation and refining.
Stainless Steel 321H Bars are commonly used in high-temperature environments such as heat exchangers, boilers, exhaust systems, and pressure vessels. They are ideal for industries including power generation, chemical processing, petrochemical, oil and gas, and refineries. Due to their enhanced creep and stress rupture resistance, SS 321H bars are favored in furnace components, superheaters, and thermal processing equipment. They also perform well in environments where welding is frequent, as the titanium stabilization prevents carbide precipitation. Their mechanical durability and resistance to oxidation ensure long service life in aggressive and high-thermal-load applications.
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