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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 | Value |
|---|---|
| Density | ~ 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.
Complete control over products allows us to ensure our customers receive the best quality prices and service. Contact us for a free quote,JBLSTEEL will provide the right solution for your project.
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