At Mitchell Stainless in Hamilton, New Zealand, we provide stainless steel bars engineered for high-temperature and demanding industrial environments. Our Stainless Steel 309 Bars are designed to resist oxidation and maintain strength under prolonged heat exposure. Ideal for furnaces, kilns, heat exchangers, and thermal processing systems, these bars deliver durability and reliable mechanical performance. Supported by Mitchell Stainless’ commitment to quality and local expertise, 309 bars provide a trusted solution for projects where high-temperature resistance and structural integrity are essential in industrial, petrochemical, and thermal processing applications.
Stainless Steel 309 Bars are manufactured from an austenitic stainless steel alloy with high chromium and nickel content. This composition ensures excellent resistance to oxidation, scaling, and thermal corrosion at elevated temperatures. The bars provide good tensile strength, toughness, and dimensional stability under continuous high-heat service. Stainless Steel 309 maintains its mechanical properties and structural integrity under thermal cycling, making it suitable for demanding high-temperature industrial and engineering applications where durability and performance are critical.
| Specifications | ASTM A276, ASTM A479 |
| Dimensions | EN, DIN, JIS, ASTM, BS, ASME, AISI |
| SS 309 Round Bars | Outside Diameter in the range of 4mm to 500mm |
| SS 309 Bright Bars | Outside Diameter in the range of 4mm to 100mm |
| SS 309 Hex Bars | 18mm – 57mm (11/16″ to 2-3/4″) |
| SS 309 Square Bars | 18mm – 47mm (11/16″ to 1-3/4″) |
| SS 309 Flat Bars | 1/2” to 10” in thickness range of 2mm to 150mm, Custom Size Stainless Steel Flats available |
| Finish | Black, Bright Polished, Rough Turned, NO.4 Finish, Matt Finish, BA Finish |
| Length | 1 to 6 Meters, Custom Cut Lengths |
| Form | Round, Square, Hex (A/F), Rectangle, Billet, Ingot, Forging Etc. |
Element | Content (%) |
Iron, Fe | 60 |
Chromium, Cr | 23 |
Nickel, Ni | 14 |
Manganese, Mn | 2 |
Silicon, Si | 1 |
Carbon, C | 0.20 |
Phosphorous, P | 0.045 |
Sulfur, S | 0.030 |
Properties | Metric | Imperial |
Tensile strength | 620 MPa | 89900 psi |
Yield strength (@ strain 0.200%) | 310 MPa | 45000 psi |
Izod impact | 120 – 165 J | 88.5 – 122 ft-lb |
Shear modulus (typical for steel) | 77 GPa | 11200 ksi |
Elastic modulus | 200 GPa | 29008 ksi |
Poisson’s ratio | 0.27-0.30 | 0.27-0.30 |
Elongation at break (in 50 mm) | 45% | 45% |
Hardness, Brinell | 147 | 147 |
Hardness, Rockwell B | 85 | 85 |
Hardness, Vickers (converted from Rockwell B hardness) | 169 | 169 |
Contact us to get a quick quote for your requirement.
We carries out rigorous performance tests on complete batches of Stainless Steel 309 Bars with regards to chemical composition, mechanical properties, and the degree of corrosion resistance. Our products are certified by recognized authorities regarding conformity to international standards for ensuring reliability and consistency with every delivery.
Stainless Steel 309 Round Bars offer excellent corrosion resistance and are available in diameters ranging from 6 mm to 200 mm. Ideal for high-temperature applications and structural uses, they ensure durability and strength.
Featuring good corrosion resistance, Stainless Steel 309 Flat Bars come in widths from 20 mm to 150 mm and thicknesses from 5 mm to 50 mm. These bars are used in construction, manufacturing, and industrial applications for their thermal stability.
Known for their corrosion resistance, Stainless Steel 309 Square Bars are available in sizes from 10 mm to 100 mm. They are utilized in various structural and industrial applications where strength and heat resistance are required.
Stainless Steel 309 Rectangular Bars provide corrosion resistance and are offered in dimensions like 20 mm x 10 mm to 150 mm x 50 mm. These bars are suitable for use in high-temperature environments and structural applications.
Offering corrosion resistance, Stainless Steel 309 Hexagonal Bars are available in sizes ranging from 6 mm to 50 mm across flats. They are often used in machining, fabrication, and for applications requiring heat resistance.
Stainless Steel 309 T-Bars are known for their high-temperature resistance and oxidation resistance. Available in sizes ranging from 15 mm x 15 mm x 6 mm to 100 mm x 100 mm x 12 mm, they are used in industrial applications such as heat exchangers and furnace components, providing durability and strength in extreme conditions.
Stainless Steel 309 Bars are commonly used in high-temperature industrial and thermal applications. Typical uses include furnace and kiln components, boilers, heat exchangers, thermal processing equipment, and petrochemical plant structures. They are also suitable for power generation systems, industrial burners, and other equipment exposed to sustained heat. At Mitchell Stainless, we supply 309 bars for projects requiring reliable performance under extreme thermal conditions. Their combination of heat resistance, oxidation resistance, and structural stability makes them a trusted solution for industries where durability and long-term mechanical integrity are essential.
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