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Stainless Steel 309 Round Bar is an austenitic stainless steel designed for superior resistance to heat and oxidation. It contains higher levels of chromium and nickel than 304, providing exceptional strength and corrosion resistance in elevated temperature environments. Stainless Steel 309 Round Bar performs well up to 1000°C, making it ideal for furnace components, heat exchangers, and kiln liners. It retains excellent mechanical properties even under prolonged heat exposure. This alloy is widely used in industries requiring durability and reliability under thermal stress.
The chemical composition of Stainless Steel 309 Round Bar typically includes around 23% chromium and 13% nickel, which form a strong protective oxide layer on the surface. This layer enhances resistance to oxidation, scaling, and corrosion in both oxidizing and reducing atmospheres. Stainless Steel 309 Round Bar also exhibits good resistance to sulfuric and nitric acid environments. Its balanced composition makes it more heat-resistant than 304 stainless steel but slightly less than 310. This makes it a cost-effective choice for high-temperature applications.
Stainless Steel 309 Round Bar offers excellent mechanical properties such as high tensile strength, good creep resistance, and superior toughness at both high and low temperatures. The alloy remains non-magnetic in the annealed condition and is easily formable and weldable. Stainless Steel 309 Round Bar retains its structural integrity even after repeated thermal cycling. It performs effectively in severe environments where oxidation and carburization are common. This makes it suitable for components exposed to fluctuating thermal and mechanical loads.
A major advantage of Stainless Steel 309 Round Bar is its remarkable oxidation resistance in continuous service up to 1093°C and intermittent service up to 982°C. The alloy resists scaling and deformation during prolonged exposure to high heat. Stainless Steel 309 Round Bar also performs well in mildly carburizing and nitriding environments. It is ideal for use in heat-treating fixtures, annealing covers, and furnace muffles. Its durability and high-temperature strength ensure long service life and minimal maintenance.
Stainless Steel 309 Round Bar can be easily fabricated and welded using standard industrial processes. It supports all common welding techniques, including TIG, MIG, and shielded metal arc welding, without the need for preheating. The alloy also offers excellent machinability and can be cold or hot worked as required. Stainless Steel 309 Round Bar’s ability to maintain surface smoothness and dimensional accuracy makes it ideal for both structural and decorative purposes. It is often polished for applications requiring aesthetic appeal and hygiene.
Applications of Stainless Steel 309 Round Bar span multiple industries, including petrochemical, power generation, cement, and aerospace. It is used in heat exchangers, furnace parts, burner tubes, kiln linings, and boiler baffles. The alloy performs reliably in oxidizing and sulfur-containing environments, ensuring long-term efficiency and safety. Stainless Steel 309 Round Bar is also utilized in thermal processing equipment and incinerators. Its combination of thermal stability and corrosion resistance makes it indispensable in high-temperature industrial systems.
In conclusion, Stainless Steel 309 Round Bar is a high-performance material that combines strength, heat resistance, and corrosion protection. Its chromium-nickel composition ensures reliable operation in both oxidizing and reducing atmospheres. Stainless Steel 309 Round Bar offers excellent weldability, formability, and durability, making it ideal for demanding thermal applications. Its cost-effectiveness and consistent performance enhance its appeal across numerous industries. Overall, it is one of the most dependable stainless steels for high-temperature structural and process applications.
Specification Table
| Grade | Standard | Form | Condition | Size Range (mm) | Finish |
|---|---|---|---|---|---|
| Stainless Steel 309 / 309S | ASTM A276, ASTM A479, ASME SA276, SA479 | Round Bar / Rod | Hot Rolled, Annealed, Pickled, Cold Drawn | 6 mm to 350 mm Dia | Black, Bright, Polished, Peeled, Turned |
| Type | Austenitic Stainless Steel | ||||
| Finish Type | Bright, Polish, BA Finish, Rough Turned | ||||
| Tolerance | H9, H10, H11, H12 or as per requirement | ||||
| Length | 1 Meter to 6 Meters (Custom Cut Lengths Available) | ||||
| Manufacturing Technique | Cold Drawn / Hot Rolled / Forged | ||||
| Application | Furnace Parts, Heat Exchangers, Kiln Linings, Boilers, Thermal Processing Equipment | ||||
Chemical Composition (Typical ranges for SS309)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.20 max |
| Manganese (Mn) | 2.00 max |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.030 max |
| Silicon (Si) | 1.00 max |
| Chromium (Cr) | 22.0 – 24.0 |
| Nickel (Ni) | 12.0 – 15.0 |
| Iron (Fe) | Balance |
Mechanical Properties (Typical)
| Property | Metric | Imperial |
|---|---|---|
| Tensile Strength | 515 MPa (min) | 75,000 psi (min) |
| Yield Strength (0.2% Offset) | 205 MPa (min) | 30,000 psi (min) |
| Elongation in 50mm | 40% (min) | 40% (min) |
| Hardness (Brinell) | ≤ 187 HB | ≤ 187 HB |
| Density | 7.98 g/cm³ | 0.289 lb/in³ |
| Melting Point | 1370 – 1400 °C | 2500 – 2550 °F |
| Modulus of Elasticity | 200 GPa | 29,000 ksi |
Equivalent Grades
| STANDARD | STAINLESS STEEL 309 EQUIVALENT GRADE |
|---|---|
| UNS | S30900 |
| WERKSTOFF NR. | 1.4828 |
| EN | X15CrNiSi20-12 |
| JIS | SUS 309 |
| BS | 309S24 |
| GOST | 20Ch23N13 |
| AFNOR | Z15CNS20-12 |
| ISO | 309 |
Dimension & Weight Chart (Selected common sizes)
Below is a representative chart showing outside diameter, wall thickness, inside diameter, cross-sectional area of metal and calculated weight per metre (kg/m). Values are calculated using density = 7.93 g/cm³ and are for guidance — use actual MTC values for procurement & engineering.
| Diameter (mm) | Cross Sectional Area (mm²) | Weight (kg/m) | Weight (lb/ft) |
|---|---|---|---|
| 6 | 28.27 | 0.222 | 0.149 |
| 10 | 78.54 | 0.616 | 0.414 |
| 12 | 113.10 | 0.888 | 0.597 |
| 16 | 201.06 | 1.580 | 1.061 |
| 20 | 314.16 | 2.466 | 1.657 |
| 25 | 490.87 | 3.850 | 2.587 |
| 30 | 706.86 | 5.540 | 3.718 |
| 40 | 1256.64 | 9.860 | 6.624 |
| 50 | 1963.50 | 15.410 | 10.358 |
| 60 | 2827.43 | 22.180 | 14.895 |
| 80 | 5026.55 | 39.580 | 26.522 |
| 100 | 7853.98 | 61.660 | 41.417 |
Types Of 309 Round Bars and Tubes
Stainless Steel Round Bar
Monel 400 K400 Round Bar
Hastelloy Round Bar
Inconel 600 Round Bar
Nickel Alloy Round Bar
Super Duplex Round Bar
Monel K500 Round Bar
Inconel 625 Round Bar
Frequently Asked Questions (FAQ)
What is Stainless Steel 309 Round Bar?
Stainless Steel 309 Round Bar is an austenitic stainless steel alloy designed for superior resistance to oxidation and high-temperature corrosion. It contains higher chromium and nickel content compared to 304, making it ideal for furnace parts and heat exchangers.
What are the key properties of Stainless Steel 309?
SS 309 offers excellent strength, oxidation resistance up to 1093°C (2000°F), good weldability, and moderate corrosion resistance in both oxidizing and reducing environments.
What is the difference between Stainless Steel 309 and 309S?
The main difference is carbon content — 309S has a lower carbon percentage, reducing carbide precipitation during welding and enhancing resistance to intergranular corrosion.
Where is Stainless Steel 309 Round Bar used?
Common applications include furnace parts, oven linings, heat exchangers, kilns, burners, boilers, and high-temperature structural components.
What are the available sizes and finishes for SS 309 Round Bars?
Sizes typically range from 6 mm to 350 mm diameter, and finishes include black, bright, polished, peeled, or turned — depending on customer requirements.
Rounds Bars Supplier
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Rounds Bars Exporter
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