ASTM A213 TP309S stainless tube for heat exchanger
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Why do conventional stainless steel tubes in high-temperature heat exchangers often suffer from oxidation spalling, sulfur corrosion, or reduced heat transfer efficiency within a short service period? The key lies in whether the material's high-temperature oxidation resistance, sulfur resistance, and manufacturing precision truly match the complexity of the operating environment.
Our ASTM A213 TP309S Stainless Steel Tube for Heat Exchanger is specifically designed for high-temperature and sulfur-containing environments, offering excellent oxidation and sulfur corrosion resistance. TP309S is a high chromium–nickel austenitic stainless steel (Cr 22–24%, Ni 12–15%), capable of forming a stable and dense oxide layer at elevated temperatures. It can maintain strong oxidation resistance during long-term service at temperatures up to approximately 1000°C, and in high-temperature, sulfur-containing environments, the service life can be extended by more than 30%.
We strictly comply with ASTM A213 standards, controlling outer diameter tolerance within ±0.3% and wall thickness tolerance within ±10%, ensuring excellent fit during heat exchanger assembly while minimizing installation stress and leakage risks. In addition, TP309S heat exchanger tubes feature thoroughly finished and cleaned inner and outer surfaces, free from scale, oil, and contaminants. The internal surface roughness (Ra) is typically controlled at ≤0.8 μm, which reduces fluid resistance and lowers fouling rates by approximately 15%–20%, thereby improving overall heat transfer efficiency.
ASTM A213 TP309S stainless tube for heat exchanger Chemical Composition (wt%)
| Element | Composition Range (%) |
| Carbon (C) | ≤ 0.08 |
| Manganese (Mn) | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Silicon (Si) | ≤ 1.00 |
| Chromium (Cr) | 22.00 – 24.00 |
| Nickel (Ni) | 12.00 – 15.00 |
| Iron (Fe) | Balance |
ASTM A213 TP309S stainless tube Mechanical Properties
| Property | Imperial Units | SI Units |
| Tensile Strength (min) | 75,000 PSI | 515 MPa |
| Yield Strength (min) | 30,000 PSI | 205 MPa |
| Elongation in 2in (min) | 35% | 35% |
| Hardness (max) | 90 HRB | 90 HRB |
ASTM A213 TP309S Stainless Steel Seamless Pipes Physical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Density | 8 g/cm3 | 0.289 lb/in³ |
| Melting point | 1454°C | 2650°F |
Tolerances of ASTM A213 TP309 Heat Exchanger Tube
| Specification | Size OD Range Inches | Tolerances | |||
|---|---|---|---|---|---|
| O.D. | Wall | ||||
| Plus | Minus | Plus | Minus | ||
| ASTM-A-213 | Under 1.000 | .004" | .004" | 20% | 0% |
| ASME-SA-213 | 1.000 to 1.500 | .006" | .005" | 20% | 0% |
| Cold Finished Seamless | 1.501 to 1.999 | .008" | .008" | 22% | 0% |
| Heat Exchanger Tube | 2.000 to 2.499 | .010" | .010" | 22% | 0% |
| Minimum Wall | 2.500 to 2.999 | .012" | .012" | 22% | 0% |
| 3.000 to 4.000 | .015" | .015" | 22% | 0% | |
| 4.001 to 5.000 | .015" | .025" | 22% | 0% | |
ASTM A213 TP309S Seamless Pipes Apllication
Oven linings
Boiler baffles
Fire box-a sheets
Furnace components
Other high temperature containers.
Payment
| Terms & Conditions | Price Item | FOB , CFR , CIF or as negotiation |
| Payment | TT, LC or as negotiation | |
| Delivery Time | 30 working days after received your deposit ( Normally according to the order quantity ) | |
| Package | Iron case ; woven bag or as per customer's requirement | |
| Quality Requirement | Mill Test Certificate will be supplied with shipment , Third Part Inspection is acceptable |
Quality Inspection
| Quality | Test | NTD ( Ultrasonic test , Eddy Current test ) |
| Mechanical Test ( Tension Test , Flaring Test , Flattening Test , Hardness Test , Hydraulic test ) | ||
| Metal Test ( Metallographic Analysis , Impact Test - High / low temperature ) | ||
| Chemical Analysis ( Photoelectric Emission Spectroscopic ) |
GNEE offers a variety of packaging options, including bare bundling, strapping, wooden crating, and the application of protective wooden guards to both ends of the pipes. All packaging is meticulously prepared to ensure compliance with seaworthiness requirements for maritime transport, or is customized to meet specific client needs.
Steel strapping is utilized to secure the pipes in place.
Plastic end caps are inserted into both ends of the pipes to provide protection.
Bundling labels and markings must be standardized and consistent.
All steel pipes within a single bundle (or batch) must originate from the same heat.
Steel pipes within the same batch must share identical heat numbers, steel grades, and dimensional specifications.
FAQ
Q: What is the maximum operating temperature of TP309S?
A.Under continuous operation, TP309S exhibits excellent oxidation resistance, with a maximum temperature resistance of 1900°F (1035°C). Under intermittent operation (i.e., environments with periodic temperature fluctuations), its upper temperature resistance limit is 1800°F (980°C). Even at these high temperatures, it maintains high mechanical strength.
Q: Can TP309S tubes be flared or expanded (tube expansion) and installed onto tube sheets?
A: Yes. ASTM A213 standard mandates flaring and flattening tests during production. TP309S in the annealed state has extremely high ductility, allowing for smooth expansion (through a roll-forming process) into tube sheet bores without cracking, thus ensuring a leak-free, sealed connection of the heat exchanger tube bundle.
Q What does the "S" stand for in TP309S?
A.The "S" stands for "Low Carbon" (Max 0.08%). Standard TP309 has higher carbon, which can lead to carbide precipitation at grain boundaries during welding. The "S" version minimizes this risk, preventing intergranular corrosion in the heat-affected zone (HAZ) after the tube is welded to a tubesheet.
