Aung Metals supplies SS 321 hollow bars, meeting stringent international quality standards through an extensive testing process. Our experienced production and quality control teams manage every step of production, ensuring the highest quality is maintained. Our quality experts thoroughly evaluate the physical, mechanical, and chemical properties of each product. A range of tests, including hardness testing, mechanical and chemical analysis, intergranular corrosion resistance, and positive material identification, are conducted to verify the product’s performance. Every product is delivered with comprehensive test certificates and analysis reports, ensuring the highest level of quality assurance.
SS 321 hollow bars are composed primarily of iron, with chromium (17-19%) and nickel (9-12%) as key alloying elements. The addition of titanium (≤0.70%) enhances resistance to intergranular corrosion. This alloy offers excellent strength, toughness, and resistance to oxidation, making it ideal for high-temperature applications. The mechanical properties include a tensile strength of 515-725 MPa, yield strength of 205 MPa, and elongation of 40% in 50 mm. It also maintains good weldability and is resistant to scaling and sensitization in temperatures up to 900°C.
| 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.
SS 321 hollow bars are widely used in high-temperature environments due to their excellent resistance to oxidation and intergranular corrosion. Common applications include heat exchangers, pressure vessels, chemical reactors, and furnace parts, where the material is exposed to elevated temperatures. They are also used in the aerospace, petrochemical, and automotive industries for components that require strength, durability, and resistance to aggressive environments. Additionally, SS 321 hollow bars are ideal for welded structures and can withstand corrosive conditions, making them suitable for both structural and high-stress applications.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Aung Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Naypyidaw, Myanmar
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