ASTM A312 TP309S Austenitic Stainless Steel Pipes
ASTM A312 TP309S (UNS S30908) is a low-carbon, heat-resistant austenitic stainless steel pipe designed for superior performance in high-temperature and oxidizing environments. The reduced carbon content enhances weldability, minimizes carbide precipitation, and improves resistance to intergranular corrosion. TP309S is widely used in heat treatment equipment, furnace components, petrochemical plants, and industries requiring stable performance at elevated temperatures up to 1100°C.
This grade offers an ideal balance of oxidation resistance, mechanical strength, and weldability, making it a highly reliable choice for demanding thermal applications.
Key Features
- Low carbon content for excellent weldability
- Superior oxidation & scaling resistance at high temperatures
- Stable mechanical strength up to 1100°C
- Resistant to carburizing & thermal shock
- Excellent resistance to intergranular corrosion
- Durable performance in cyclic heating conditions
- Suitable for both seamless & welded construction
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| UNS | S30908 |
| EN/DIN | 1.4833 |
| JIS | SUS309S |
| BS | 309S24 |
Available Sizes
-
Outer Diameter: 6 mm – 610 mm
-
Wall Thickness: 1.2 mm – 60 mm
-
Schedules: SCH 5 – XXS
-
Length: Up to 12 meters
ASTM A312 TP309S Chemical Composition
| Element | % |
|---|---|
| C | ≤ 0.08 |
| Mn | ≤ 2.00 |
| Si | ≤ 1.00 |
| P | ≤ 0.045 |
| S | ≤ 0.030 |
| Cr | 22.0 – 24.0 |
| Ni | 12.0 – 15.0 |
| N | ≤ 0.10 |
| Fe | Balance |
ASTM A312 TP309S Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength | ≥ 205 MPa |
| Elongation | ≥ 40% |
| Hardness | ≤ 192 HB |
ASTM A312 TP309S Physical Properties
| Property | Value |
|---|---|
| Density | 7.9 g/cm³ |
| Melting Range | 1398–1454°C |
| Thermal Conductivity | 14.2 W/m·K |
| Electrical Resistivity | 0.78 µΩ·m |
| Elastic Modulus | 200 GPa |
| Coefficient of Thermal Expansion | 15.3 µm/m°C (20–100°C) |
Types of TP309S Pipes
- Seamless Stainless Steel Pipes
- Welded Pipes
- ERW Pipes
- EFW Pipes
- Hot Finished Pipes
- Cold Drawn Pipes
- Polished Pipes (180 / 240 / 320 / 600 Grit)
- Fabricated Pipes
Applications
- Heat Treatment Furnaces
- Petrochemical Processing
- Power Generation Units
- Exhaust Systems & Heat Exchangers
- Kilns, Burners & Incinerators
- Boiler & Superheater Tubes
- Carburizing & Annealing Chambers
- High-Temperature Industrial Ducts
- Chemical & Refinery Equipment
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