ASTM A213 TP309 Stainless Steel Tubes (UNS S30908)
ASTM A213 TP309 Stainless Steel Tubes (UNS S30908) are high-temperature austenitic stainless steel tubes designed to deliver excellent oxidation resistance, thermal stability, and mechanical strength in elevated-temperature environments. With high chromium and nickel levels, TP309 withstands temperatures up to 1100°C, making it ideal for furnace parts, superheaters, boilers, heat exchangers, and petrochemical processing.
TP309 is a lower‐carbon version of TP309H, offering good weldability and resistance to thermal shock.
Key Features
- Excellent oxidation resistance up to 1100°C
- High chromium & nickel content for thermal stability
- Superior corrosion resistance in harsh & carburizing atmospheres
- Good weldability and formability
- Strong performance in cyclic thermal conditions
- Ideal for high-temperature continuous service
Equivalent Grade
| Standard | Grade |
|---|---|
| UNS | S30908 |
| EN / DIN | 1.4828 / X15CrNi23-12 |
| JIS | SUS 309 |
| GB | 12Cr23Ni12 |
| BS | 309S |
| ISO | 309 |
Available Sizes
- Outside Diameter: 6 mm to 114 mm
- Wall Thickness: 0.5 mm to 12 mm
- Length: 1–12 meters (custom available)
- Forms: Straight, U-bend, Coil-form
ASTM A213 TP309 Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Manganese (Mn) | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Silicon (Si) | ≤ 1.00 |
| Chromium (Cr) | 22.0 – 24.0 |
| Nickel (Ni) | 12.0 – 15.0 |
| Nitrogen (N) | ≤ 0.10 |
| Iron (Fe) | Balance |
ASTM A213 TP309 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 620 MPa |
| Yield Strength (0.2%) | ≥ 310 MPa |
| Elongation (%) | ≥ 40 |
| Hardness (HBW) | ≤ 192 |
Physical Properties
| Property | Value |
|---|---|
| Density | 7.9 g/cm³ |
| Melting Point | 1390–1440°C |
| Thermal Conductivity | 14.2 W/m•K |
| Electrical Resistivity | 0.78 μΩ•m |
| Modulus of Elasticity | 200 GPa |
| Coefficient of Expansion | 15.4 μm/m°C |
Types of ASTM A213 TP309 Tubes
- Seamless Stainless Steel Tubes
- Heat Exchanger Tubes
- Superheater Tubes
- Boiler Tubes
- Reheater Tubes
- U-Bend Tubes
- Cold Drawn Tubes
- Polished Tubes (180–400 Grit)
Applications
- Industrial Furnaces
- High-Temperature Boilers
- Superheaters & Reheaters
- Heat Exchangers
- Petrochemical Processing Units
- Refinery Heaters & Catalytic Cracking
- Thermal Processing Equipment
- Exhaust Systems & Burners
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