ASTM A249 TP309S Stainless Steel Superheater Tubes
Specification:ASTM A249 / ASME SA249
Manufacturing Type:ERW / Welded
Delivery Condition:Annealed and Pickled (AP), Polished
Surface Finish:BA, 2B, No.4, No.1, No.3, No.8, 8K, HL, 2D, 1D, Mirror Polished, 180G, 320G, 400G Satin/ Hairline, 400G, 500G, 600G or 800G
Outside Diameter (OD):6 to 304.8 mm
Wall Thickness Range:0.5 to 6 mm
Standard:SUS, JIS, AISI, ASTM, GB, DIN, EN
ASTM A249 TP309S Stainless steel superheater tubes introduction
ASTM A249 is the standard specification for welded stainless steel pipes for boilers, superheaters and heat exchangers issued by the American Society for Testing and Materials (ASTM). TP309S is one of the steel grades, an austenitic stainless steel with high chromium (22-24% Cr) and nickel (12-15% Ni) and a carbon content of ≤0.08%. It has excellent high-temperature oxidation resistance and medium-temperature strength, and is specially designed for superheater piping systems in high-temperature environments.
ASTM A249 TP309S Welded austenitic stainless steel pipe
How to distinguish TP309S from high-temperature stainless steel TP310S tubes?
Temperature range: TP309S is suitable for 870-980℃ oxidation resistance, TP310S (24-26% Cr, 19-22% Ni) can withstand higher temperatures (≤1150℃), but the cost is higher.
Cost-effectiveness: TP309S is more cost-effective than TP310S at medium high temperatures (<1000℃), and is suitable for most power stations and industrial superheater scenarios.
Why choose GNEE?
GNEE is a professional supplier of stainless steel welded pipes. We understand product parameters and industry application cases. If you need technical consultation or boiler piping system design support, please contact us for free corrosion condition analysis and customized quotation to provide long-life and high-reliability pipe solutions for your boiler equipment!
Specification of ASME SA249 TP309S Welded Tube
| Standard | ASTM A249 / ASME SA249 |
| Material Grade | TP309S (UNS S30908) |
| Size Range | OD: 1/8"–12" (3.2–304.8 mm) Wall Thickness: 0.015–0.320" (0.4–8.1 mm) Length: Customizable (typically 20–40 ft). |
| Dimensional Tolerances | - OD: ±1% (≤114.3 mm) or ±0.004"–±0.38 mm (varies by size). - Wall Thickness: ±10%. - Length: +1/8"–0" (≤24 ft). |
| Mechanical Properties | - Tensile Strength: ≥75 ksi (515 MPa) - Yield Strength: ≥30 ksi (205 MPa) - Elongation: ≥40% - Hardness: ≤90 HRB. |
| Heat Treatment | Solution Annealed (1050–1100°C + rapid cooling) to ensure uniform microstructure and corrosion resistance. |
| Surface Finish | - Standard: Annealed & pickled (2B finish, Ra ≤ 1.6 μm) - Optional: Polished (Ra ≤ 0.8 μm) or electropolished1213. |
| Corrosion Resistance | - Oxidation Resistance: Up to 900°C (Cr₂O₃ scale formation). - Acid Resistance: Resistant to sulfuric, phosphoric, and nitric acids. |
| Welding | - Processes: TIG/MIG with ER309L filler metal. - Post-Weld: No heat treatment required815. |
| Certifications | - EN 10204 3.1 - ASME BPVC Section - CE PED 2014/68/EU - Hydrostatic test (1.5× design pressure) |
Supplier of ASME SA 249 TP309S Stainless Steel Welded Tubing
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