309S seamless stainless steel pipe is a high-alloy heat-resistant stainless steel, with exceptional high-temperature strength, outstanding oxidation resistance, and good corrosion resistance.
Standard: ASTM A213,A312,A269,EN 10216-5,JIS G3459
Material: 309,309S
OD: 5mm – 300mm
W.T.: Sch. 5S,10S,40S,80S,SCH120, SCH140, SCH160, XXS
Length: 5.8m,6m; cut to length
309S seamless stainless steel pipe is an austenitic stainless steel pipe specifically designed for high-temperature service, containing approximately 23% chromium and 13–15% nickel, offering exceptional high-temperature performance and oxidation resistance, making it suitable for environments exceeding 800°C. The seamless process ensures high-pressure resistance and leak-free performance.
Under continuous use conditions, 309S pipe can withstand temperatures approaching 1100°C (approximately 2000°F). Its high chromium and nickel content ensures it maintains excellent oxidation resistance and mechanical strength even in environments involving repeated heating and cooling cycles. Compared to 304/316 stainless steels, 309S tubing provides superior stability and oxidation resistance in continuous high-temperature applications around 980°C, making it suitable for demanding high-temperature environments such as heat treatment furnaces, industrial boilers, steel mill hot blast ducts, flue gas ductwork, and burners.
309S seamless stainless steel pipe is a high-alloy heat-resistant stainless steel. Its high-chromium, high-nickel alloy composition offers exceptional high-temperature strength, outstanding oxidation resistance, and good corrosion resistance. This makes it an indispensable key material for high-temperature equipment such as industrial furnaces, boilers, heat exchangers, and chemical reactors.
Excellent High-Temperature Resistance:
309S stainless pipe can withstand temperatures up to approximately 1038°C (1900°F) during continuous operation and up to 1149°C (2100°F) during intermittent operation. It maintains long-term high-load service capability within the 650–700°C range and exhibits outstanding thermal aging resistance.
Superior Oxidation Resistance:
High chromium and nickel content enable 309S to form a dense chromium oxide film on its surface, effectively blocking corrosion by oxidizing media. 309S tubing provides excellent oxidation resistance and corrosion resistance, ensuring long-term equipment durability and preventing oxidation and spalling under high-temperature environments. This characteristic allows 309S tubing to operate stably in high-temperature atmospheres and high-temperature oxidizing acid mist environments, significantly outperforming low-alloy stainless steels.
309S contains 22–24% chromium and 12–15% nickel, the higher alloy content compared to 304/316 provides superior heat resistance and oxidation resistance, also enhances the creep strength and thermal shock resistance at temperatures above 500°C of 309s stainless steel.
309S is the low-carbon version of 309 (C ≤ 0.08%). The low carbon content minimizes the tendency for intergranular carbide precipitation, reduces susceptibility to intergranular corrosion at elevated temperatures, and significantly improves weldability and resistance to intergranular corrosion. Post-weld solution treatment (holding at 1050–1100°C followed by rapid cooling) eliminates welding stresses, dissolves carbides at grain boundaries, restores the corrosion resistance and high-temperature strength, and ensures the welded zones also possess excellent high-temperature performance.
| Elements | UNS S30908 (ASTM) |
|---|---|
| C | ≤ 0.08 |
| Cr | 22.0 – 24.0 |
| Ni | 12.0 – 15.0 |
| Mn | ≤ 2.00 |
| Si | ≤ 0.75 / ≤ 1.00 |
| P | ≤ 0.045 |
| S | ≤ 0.030 |
| Properties | ASTM A213/A312/A276,min |
|---|---|
| Tensile Strength, σb | ≥ 75 ksi (515 MPa) |
| Yield Strength, σ0.2 | ≥ 30 ksi (205 MPa) |
| Elongation, δ5 | ≥ 40% (in 50mm) |
| Reduction of Area, ψ | – |
| Hardness | ≤ 90 HRB / ≤ 217 HBW |
| Properties | Αξία |
|---|---|
| Πυκνότητα | ~ 7.9 – 8.0 g/cm³ |
| Melting Range | 1399 – 1454 °C |
| Specific Heat, 0-100°C | ~ 500 J/(kg·K) |
| Thermal Conductivity, 100°C | ~ 14.2 W/(m·K) |
| Mean Coeff. of Thermal Expansion, 0-100°C | ~ 15.9 µm/(m·°C) |
| Electrical Resistivity, 20°C | ~ 0.78 µΩ·m |
| Magnetism | Non-magnetic in the annealed state |
309S stainless steel piep is widely used in numerous industrial sectors due to its outstanding high-temperature performance.
We have established mature processing production lines capable of providing various treatments and customization services tailored to project requirements:
Cutting and Heat Treatment:
Customized services include length cutting, solution annealing, and high-temperature rapid cooling to eliminate internal stresses, enhance ductility, and improve corrosion resistance.
Thick-Wall and Special Specifications:
Capable of producing large-diameter, thick-wall, and long-length 309ss pipe to meet specialized engineering requirements for dimensions and pressure ratings.
Surface Treatment:
Bright annealing and acid pickling/passivation are available to remove oxide scale from both inner and outer surfaces, creating a uniform, bright finish that enhances corrosion resistance and facilitates subsequent processing and leak detection.
Custom Drawings:
We produce complex components like non-standard pipe fittings and flange joints based on customer-provided engineering drawings or samples. Our specialized technical team offers consultation and optimization recommendations to ensure products perfectly fit project requirements.
Ο πλήρης έλεγχος των προϊόντων μας επιτρέπει να διασφαλίσουμε ότι οι πελάτες μας θα λαμβάνουν τις καλύτερες τιμές ποιότητας και υπηρεσίες. Επικοινωνήστε μαζί μας για μια δωρεάν προσφορά, η JBLSTEEL θα σας προσφέρει τη σωστή λύση για το έργο σας.
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