309 stainless steel tube, commonly known as TP309 or alloy 309, is an austenitic stainless steel made from chromium (22-24%), nickel (12-15%), manganese (approximately 2%), and traces of other elements. It is one of the most durable grades of stainless steel tubes.
ASTM A213 Stainless Steel 309 Seamless Tube Manufacturer
We are Xintongda Special Steel (XTD), a Premier manufacturer in China, for seamless tubes. We manufacture and supply stainless steel 309 seamless tubes. Also known as TP309 or alloy 309, this is a High-performance tube made from a ;single piece of austenitic stainless steel. It consists of 22-24% chromium, 12-15% nickel, around 2% manganese, and slight traces of other elements. Our TP309 seamless tubes are manufactured in strict compliance with ASTM A213, A269, A511, and EN 10216 standards. Due to its high amount of chromium and nickel, the TP309 provides excellent high-temperature strength, oxidation resistance up to 1038 °C (1900 °F) under non-cyclic conditions, and corrosion resistance. Due to these characteristics, the TP 309 SMLS tube finds its application in furnace components, heat exchangers, the petrochemical industry, and other major industries.
As a premier manufacturer and a major stockist for over four decades (stock list check Stock & Inventory – Zhejiang Xintongda Steel ), XTD delivers industry-leading lead times:
- In-Stock Inventory: Ready for dispatch within 7 days.
- Custom Production: Manufacturing with delivery in 15–60 days.
Our extensive international certifications are your guarantee of uncompromising quality
Product specifications:
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Standard
ASTM A213
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OD Range
6.35-257 mm
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Thickness
0.89-12.7 mm
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Length
≤ 22 m
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Technical Data
Technical Data
Steps Involved in Manufacturing 309 Stainless Steel Tubing
To manufacture our SS 309 Seamless Tube, we first heat and pierce a solid billet of this alloy to make it hollow, then hot work and cold draw it to achieve precise dimensions. After that, solution annealing is performed to increase the tube’s high-temperature strength and oxidation resistance. The last step is to pickle and straighten before we send the tubes for testing. To get to know the whole process in detail, visit this page.
What are the Key Features of 309 Stainless Steel Tube?
The 309 Seamless Stainless Steel Tube has 5 features that make it stand out. These are high temperature resistance, high chromium & nickel content, oxidation/scaling resistance, excellent corrosion resistance, and thermal shock resistance.
- High Temperature Resistance: The high chromium and nickel content of the AISI 309 stainless steel tube stabilises the austenitic structure even when exposed to high heat. This prevents loss of strength, excessive grain growth, and structural instability, which is why the alloy performs well at elevated temperatures.
- High Chromium and Nickel Content: The chromium present in the alloy increases oxidation and corrosion resistance, while the nickel content stabilises the microstructure and improves ductility.
- Oxidation/Scaling Resistance: 309 stainless tube provides high oxidation resistance because chromium forms a layer of chromium oxide when exposed to oxygen at elevated temperatures.
- Corrosion Resistance: The chromium-oxide layer, combined with the austenitic stability by nickel, helps the tube to withstand mild chemical exposure, combustion by-products, and high-temperature corrosive gases.
- Thermal Shock Resistance: The austenitic microstructure of TP309 Seamless Stainless Steel tube helps it tolerate rapid heating and thermal shocks.
ASTM A213 TP309 Stainless Steel Tube Equivalent Material
309 stainless steel seamless tube is recognised by its standard equivalent designation as UNS S30900. It is also globally known by its Werkstoff number as DIN 1.4833.
| STANDARD | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN |
| SS 309 | 1.4833 | S30900 | SUS 309 | 309S24 | 20KH20N14S2 | Z17CNS20-12 | X12CrNi23-13 |
ASTM A213 TP309 Stainless Steel Tube Tolerances
The tolerance of ASTM A213 TP309 seamless tube depends on the applicable standard and its dimensions, including outside diameter (OD) and wall thickness. The table below provides a clear overview of the allowable tolerances based on the respective size ranges.
| STANDARD | OD (D) MM | TOLERANCE (MM) COMMON | THICKNESS (S) MM & TOLERANCE | LENGTH MM | LENGTH TOLERANCE | |
| THICKNESS (S) MM | TOLERANCE | |||||
| A213 HFD | D ≤ 100 | +0.4 / -0.8 | D≤100, S≤2.4 | +40% / 0 | HFD, all size | +5.0 / 0 |
| - | +0.4 / -1.2 | D≤100, 2.4<S≤3.8 | +35% / 0 | |||
| - | +0.4 / -1.6 | D≤100, 3.8<S≤4.6 | +33% / 0 | |||
| - | - | D≤100, S>4.6 | +28% / 0 | |||
| 100<D≤200 | +0.4 / -1.2 | D>100, 2.4<S≤3.8 | +35% / 0 | |||
| 200<D≤225 | +0.4 / -1.6 | D>100, 3.8<S≤4.6 | +33% / 0 | |||
| - | - | D>100, S>4.6 | +28% / 0 | |||
| A213 CFD | D<25 | ±0.10 | D≤38.1 | +20% / 0 | CFD, D<50.8 | +3.0 / 0 |
| 25≤D≤40 | ±0.15 | |||||
| 40<D≤50 | ±0.20 | |||||
| 50<D≤65 | ±0.25 | |||||
| 65<D≤75 | ±0.30 | |||||
| 75≤D≤100 | ±0.38 | D>38.1 | +22% / 0 | CFD, D≥50.8 | +5.0 / 0 | |
| 100<D≤200 | +0.38 / -0.64 | |||||
| 200<D≤225 | +0.38 / -1.14 | |||||
100% Certified Testing & Documentation
- EN 10204 3.1 and EN 10204 3.2 Material Test Certificates (MTC)
- Raw Materials Certificate
- 100% PMI
- Heat Treatment Charts
- Third-Party Inspection Report
- Surface roughness and size measurement
- Manufacturer Test Certificate (Impact Testing, Flattening, Flare, Bend, Hardness, Intergranular, Pitting Corrosion, Grain size, ET, UT, HT)
- Laboratory Test Certificate from the Government-Approved Lab
Industries and Applications of SS 309 Stainless Steel Tubes
The applications of ASME SA213 TP 309 stainless steel tubes include various industries.
Food Processing
Used for steam distribution tubes in cooking & sterilisation equipment, hot air circulation tubes in ovens, burner & radiant tube assemblies in continuous food furnaces, and exhaust and flue tubes in food ovens.
Industrial Furnaces
Extensively used in furnace muffle tubes, thermocouple protection tubes, heat recovery tubes, and radiant tubes.
Pulp & Paper Industry
UNS S30900 Tubes are generally found in black liquor recovery boiler tubing, pulp drying systems, high-temperature air and gas handling lines, and flue and exhaust gas transfer tubing.
Automotive Exhaust Systems
Used in exhaust manifolds thermal sleeves, turbocharger inlet and outlet tubing, and exhaust gas transfer tubes.
Boiler Components
The INOX 309 tube is found in superheater and reheater support tubes, air preheater tube sections, ash handling and exhaust duct liners, and burner throat and flame guide tubes.
Flue Gas Desulfurization (FGD) Systems
Generally found in gas reheater tubing, absorber inlet duct tubing, and hot flue gas transfer lines.
Frequently Asked Questions
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What is 309 Stainless Steel Tube?
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Is stainless steel 309 seamless tube magnetic?No, stainless steel 309 seamless tube is non-magnetic in its annealed state.
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What is the difference between 304 and 309 stainless steel tube?309 stainless steel tube has higher chromium and nickel content than 304, which makes it more resistant to oxidation and high temperature.
- Steps Involved in Manufacturing 309 Stainless Steel Tubing
- What are the Key Features of 309 Stainless Steel Tube?
- ASTM A213 TP309 Stainless Steel Tube Equivalent Material
- ASTM A213 TP309 Stainless Steel Tube Tolerances
- 100% Certified Testing & Documentation
- Industries and Applications of SS 309 Stainless Steel Tubes
- Frequently Asked Questions