The composition of Stainless Steel 309 Tubing includes about 22–24% chromium, 12–15% nickel, along with trace amounts of carbon, manganese, and silicon, with iron making up the rest. This blend provides excellent resistance to oxidation and scaling at temperatures up to 1000°C, making it perfect for high-temperature applications. The tubing boasts a tensile strength of around 515 MPa and a yield strength of about 205 MPa, along with good ductility and toughness. These mechanical properties enable it to endure thermal cycling and corrosive environments while maintaining its shape and strength.
| Specifications | ASTM A/ASME SA213 / A249 / A269 |
| Dimensions | ASTM, ASME and API |
| SS 309 Tubes Size | 10.29 OD (mm) – 762 OD (mm) |
| Thickness | 0.35 OD (mm) to 6.35 OD (mm) in thickness ranging from 0.1mm to 1.2mm. |
| Schedule | SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS |
| Type | Seamless / ERW / Welded / Fabricated |
| Form | Round Tubes, Custom Tubes, Square Tubes, Rectangular Tubes, “U” Shape, Hydraulic Tubes |
| Length | Single Random, Double Random & Cut Length. |
| End | Plain End, Beveled End, Treaded |
| Grade | 309 | |
|---|---|---|
| min | max | |
| C | – | 0.20 |
| Mn | – | 2 |
| Si | – | 1 |
| P | – | 0.045 |
| S | – | 0.030 |
| Cr | 18.0 | 23.0 |
| Mo | – | – |
| Ni | 8.0 | 14.0 |
| N | – | – |
| Grade | 309 | |
|---|---|---|
| Tensile Strength (MPa) min | 620 | |
| Yield Strength 0.2% Proof (MPa) min | 310 | |
| Elongation (% in 50mm) min | 45 | |
| Hardness | Rockwell B (HR B) max | 85 |
| Brinell (HB) max | 169 | |
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Stainless Steel 309 Tubing is widely used in high-temperature and corrosive environments due to its excellent heat resistance and durability. It is commonly found in heat exchangers, boilers, furnaces, and exhaust systems, making it ideal for industries such as power generation, petrochemicals, and thermal processing. This tubing is also used in burner assemblies, annealing covers, and catalytic converters. Its superior oxidation resistance allows it to perform well in chemical plants, incinerators, and food processing industries. The high strength and thermal stability of 309 tubing ensure reliable performance in extreme operating conditions.
Excellent corrosion resistance and is available in sizes ranging from 1/8″ to 12″ nominal diameter. It is ideal for high-temperature applications, with superior strength and durability. This tubing type ensures leak-free connections due to its seamless construction.
Good corrosion resistance and is available in sizes from 1/8″ to 24″ nominal diameter. It is produced by welding rolled strips of 309 stainless steel, making it cost-effective for various industrial applications. The welded joints are robust, ensuring long-term reliability.
High-temperature environments and comes in sizes from 1/4″ to 12″ outer diameter. Its excellent corrosion resistance makes it suitable for chemical processing and power generation industries. This tubing ensures efficient heat transfer and durability in demanding conditions.
Superior corrosion resistance and precision. It is ideal for use in high-pressure and high-temperature instrumentation systems. The smooth internal surface ensures accurate and reliable fluid flow.
Exceptional corrosion resistance and are available in sizes from 1/4″ to 5″ outer diameter. They are designed to withstand high temperatures and pressures in boiler systems. These tubes offer longevity and efficiency in steam generation and other heat-related processes.
Excellent corrosion resistance and are shaped for efficient heat exchange in compact spaces. They are widely used in heat exchangers, condensers, and economizers. Their U-shape design ensures optimal thermal performance.
High corrosion resistance and is available in sizes from 1/4″ to 2″ outer diameter. It is used in condensers for efficient heat transfer in various industrial processes. This tubing type ensures durability and performance in corrosive environments.
Excellent corrosion resistance and enhanced heat transfer efficiency. The finned design increases the surface area, making them ideal for heat exchangers and cooling systems. These tubes provide reliable performance in high-temperature applications.
You’ll find Stainless Steel 309 Tubing widely used in furnaces, boilers, heat exchangers, and chemical processing plants. It’s also a go-to choice for refineries, gas turbines, and marine applications, thanks to its outstanding heat and corrosion resistance. The tubing’s excellent weldability and formability make it straightforward to fabricate and install in complex systems. With its ability to resist carburization and oxidation, Stainless Steel 309 Tubing guarantees reliable performance, low maintenance, and a long service life in both oxidizing and reducing industrial environments.
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