ASTM A269 TP304H Stainless Steel Tubes
ASTM A269 TP304H is a high-carbon modification of the 304 austenitic stainless steel grade, engineered for enhanced high-temperature strength and improved creep resistance. With a higher carbon content compared to standard TP304, TP304H is ideal for elevated-temperature applications, including boiler tubes, superheater tubes, and heat exchangers operating under continuous high heat.
Designed for excellent corrosion resistance, oxidation resistance, and superior structural stability at elevated temperatures, ASTM A269 TP304H tubes are widely used across petrochemical, power generation, and furnace industries.
Key Features
- High carbon content increases elevated-temperature strength
- Improved creep resistance for long-term high-heat applications
- Excellent corrosion and oxidation resistance
- Superior heat resistance and structural stability
- Good weldability and formability
- Smooth surface finish for clean fluid flow
- Suitable for boiler, superheater, and heat exchanger use
Specification
| Property | Details |
|---|---|
| Standard | ASTM A269 |
| Grade | TP304H |
| Material | High-Carbon Austenitic Stainless Steel |
| Process | Seamless / Welded |
| Surface Finish | Annealed & Pickled / Bright Annealed / Polished |
| Outer Diameter | 6 mm to 101.6 mm (or customized) |
| Wall Thickness | 0.5 mm to 6 mm (or customized) |
| Length | Single Random, Double Random, Cut-to-Length |
| Forms | Round, Square, Rectangular, U-Tube |
| Tolerance | As per ASTM A269 |
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | S30409 |
| EN | 1.4948 |
| JIS | SUS 304H |
| DIN | X6CrNi18-10 |
Available Sizes
- Outside Diameter: 6 mm – 101.6 mm
- Wall Thickness: 0.5 mm – 6 mm
- Length: Up to 6 meters or custom
- Forms: Round Tube, Square Tube, Rectangular Tube, U-Bent Tube
ASTM A269 TP304H Chemical Composition
| Element | Min | Max |
|---|---|---|
| Carbon (C) | 0.04 | 0.10 |
| Manganese (Mn) | – | 2.00 |
| Silicon (Si) | – | 0.75 |
| Phosphorus (P) | – | 0.045 |
| Sulfur (S) | – | 0.030 |
| Chromium (Cr) | 18.0 | 20.0 |
| Nickel (Ni) | 8.0 | 11.0 |
| Nitrogen (N) | – | 0.10 |
| Iron (Fe) | Balance | Balance |
ASTM A269 TP304H Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (MPa) | 515 min |
| Yield Strength 0.2% (MPa) | 205 min |
| Elongation (%) | 35 min |
| Hardness (Rockwell B) | 92 max |
ASTM A269 TP304H Physical Properties
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ |
| Melting Range | 1370 – 1400°C |
| Thermal Conductivity | 16.2 W/m·K |
| Specific Heat | 500 J/kg·K |
| Electrical Resistivity | 0.73 μΩ·m |
| Modulus of Elasticity | 193 GPa |
Types of ASTM A269 TP304H Tubes
- Seamless Tubes
- Welded Tubes
- Bright Annealed Tubes
- Annealed & Pickled Tubes
- Heat Exchanger Tubes
- Superheater Tubes
- Instrumentation Tubes
- U-Bend Tubes
- Polished Tubes (180G, 320G, 600G)
Application
- Power Generation Industry
- Boiler & Superheater Tubing
- Heat Exchanger Systems
- Petrochemical & Refinery Plants
- Furnace Components
- Steam Lines & Pressure Vessels
- Chemical Processing Equipment
- High-Temperature Fluid Transport
- Industrial Heating Systems
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