At Mitchell Stainless in Hamilton, New Zealand, we supply stainless steel bars designed for high-temperature and demanding industrial applications. Our Stainless Steel 309S Bars are low-carbon austenitic stainless steel bars engineered to resist oxidation and scaling under prolonged heat exposure. Ideal for furnaces, kilns, heat exchangers, and thermal processing systems, these bars combine strength, durability, and corrosion resistance. Supported by Mitchell Stainless’ commitment to quality and local expertise, 309S bars provide reliable long-term performance in environments where high heat and structural integrity are critical.
Stainless Steel 309S Bars are manufactured from a low-carbon austenitic stainless steel alloy containing high chromium and nickel content. The reduced carbon minimizes carbide precipitation during high-temperature service, improving resistance to intergranular corrosion. These bars provide excellent tensile strength, toughness, and dimensional stability under continuous heat exposure. Stainless Steel 309S maintains mechanical performance and oxidation resistance in extreme thermal environments, making it suitable for demanding industrial applications requiring long-term durability and reliability.
| Grade | Stainless Steel 309S (UNS 30908) |
| Standard | ASTM A276 / ASME SA276 |
| Diameter | 25mm to 152mm dia |
| Condition | Cold Drawn & Polished Cold Drawn, Centreless Ground & Polished |
| Finish | Bright, Polish & Black |
| Type | Round/Square/ Hexagonal/ Rectangular |
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 ensures the highest quality of stainless steel 309S tiles through rigorous testing and certification. Each product undergoes extensive testing, including chemical composition, mechanical properties and durability testing. Certified to accepted industry standards, our breweries deliver efficiency, reliability and compliance, making them ideal for complex applications.
Stainless Steel 309S Round Bars are designed for high-temperature applications, offering exceptional oxidation resistance and durability. They are ideal for components in furnaces, heat exchangers, and other high-heat environments.
Stainless Steel 309S Flat Bars provide outstanding heat resistance and strength, suitable for applications such as heat shields, furnace parts, and structural components exposed to high temperatures and corrosive environments.
Stainless Steel 309S Square Bars are used in high-temperature settings where heat resistance and durability are critical. They are commonly employed in manufacturing parts for the aerospace industry, industrial equipment, and heat exchangers.
Stainless Steel 309S Rectangular Bars are ideal for high-temperature applications requiring superior oxidation resistance. They are often used in furnace components, structural supports, and industrial parts that endure extreme heat and corrosive conditions.
Stainless Steel 309S Hexagonal Bars are perfect for applications needing high-temperature performance and corrosion resistance. They are utilized in industrial processes, furnace parts, and equipment subjected to severe thermal conditions.
Stainless Steel 309S T-Bars offer excellent heat resistance and strength, making them suitable for high-temperature structural applications. They are commonly used in heat exchangers, support structures, and furnace components.
Stainless Steel 309S Bars are commonly used in high-temperature industrial applications. Typical uses include furnace and kiln components, heat exchangers, boilers, thermal processing equipment, and petrochemical plant structures. They are also suitable for power generation facilities, industrial burners, and other systems exposed to sustained heat and thermal cycling. At Mitchell Stainless, we supply 309S bars for projects that require dependable performance, corrosion resistance, and structural integrity under extreme conditions. Their low-carbon composition and heat resistance make them a trusted solution for industries operating in severe thermal environments.
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