Maduka Metals, a leading manufacturer and supplier located in Abuja, Nigeria, specializes in high-quality Stainless Steel 321 Hollow Bars that are crafted for exceptional strength and impressive corrosion resistance, especially in high-temperature settings. These hollow bars are enhanced with titanium, which boosts their resistance to intergranular corrosion and oxidation. With a commitment to precision engineering and compliance with international standards, Maduka Metals ensures that their Stainless Steel 321 Hollow Bars are perfect for industries like petrochemical, aerospace, and marine, where reliability, durability, and a long service life are crucial.
The composition of Stainless Steel 321 Hollow Bar includes chromium (17–19%), nickel (9–12%), titanium (≤0.7%), carbon (≤0.08%), along with manganese, silicon, phosphorus, sulfur, and iron as the balance. This titanium-stabilized austenitic alloy is known for its remarkable resistance to oxidation and carbide precipitation. It boasts a tensile strength of about 515 MPa, a yield strength of around 205 MPa, and excellent ductility, toughness, and creep resistance at temperatures reaching up to 870°C, all while maintaining its strength and formability under thermal stress.
| 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 321 | 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 |
The addition of titanium in SS 321 stabilizes carbon, preventing the formation of chromium carbides at grain boundaries. This reduces the risk of intergranular corrosion, improving the alloy's resistance to corrosion in high-temperature environments and aggressive chemical conditions.
In aerospace, SS 321 Hollow Bar is used for exhaust systems, jet engine components, and fuel systems due to its high-temperature resistance. In the chemical industry, it's used for heat exchangers, reactors, and piping in corrosive environments.
Stainless Steel 321 Hollow Bars find extensive applications in chemical processing, heat exchangers, jet engine components, exhaust manifolds, refineries, and thermal equipment. Their ability to withstand high temperatures and resist scaling makes them ideal for continuous exposure to elevated conditions. Additionally, they are well-suited for piping systems, instrumentation, and structural applications where corrosion and oxidation resistance under cyclic heating is essential, ensuring reliable performance in challenging industrial and engineering environments.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Maduka Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Abuja, Nigeria
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