ASTM A213 TP304H Stainless Steel Tubes (UNS S30409)
ASTM A213 TP304H Stainless Steel Tubes (UNS S30409) are a high-carbon version of 304 grade designed to offer enhanced high-temperature strength, creep resistance, and durability. The added carbon improves the material’s ability to withstand elevated temperatures, making TP304H ideal for superheaters, boiler tubes, heat exchangers, furnaces, and petrochemical applications operating above 600°C.
These tubes combine corrosion resistance, superior strength, and weldability, making them a preferred material for high-temperature service conditions.
Key Features
- High Carbon Content (H Grade) for improved high-temperature performance
- Excellent Creep Strength & Stress Rupture Resistance
- Superior Corrosion & Oxidation Resistance
- Ideal for Elevated Temperature Service
- Enhanced Mechanical Strength vs TP304/TP304L
- Perfect for Boilers, Superheaters & Heat Exchangers
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| UNS | S30409 |
| EN / DIN | 1.4948 |
| JIS | SUS 304H |
| GB | 07Cr19Ni10 |
| BS | 304S51 |
| ASTM | 304H |
Available Sizes
- Outside Diameter (OD): 6 mm to 101.6 mm
- Wall Thickness: 0.5 mm to 12.7 mm
- Length: Up to 12 meters
- Custom Cut Lengths Available
ASTM A213 TP304H Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.04 – 0.10 |
| Manganese (Mn) | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Silicon (Si) | ≤ 0.75 |
| Chromium (Cr) | 18.0 – 20.0 |
| Nickel (Ni) | 8.0 – 11.0 |
| Nitrogen (N) | ≤ 0.10 |
ASTM A213 TP304H Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (MPa) | ≥ 515 |
| Yield Strength 0.2% (MPa) | ≥ 205 |
| Elongation (%) | ≥ 35 |
| Hardness (HBW) | ≤ 192 |
| Creep Strength | Excellent for high-temperature service |
Physical Properties
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ |
| Melting Point | 1400–1450°C |
| Thermal Conductivity @100°C | 16.2 W/m•K |
| Electrical Resistivity | 0.72 μΩ•m |
| Modulus of Elasticity | 193 GPa |
| Coefficient of Expansion | 17.3 μm/m°C |
Types of ASTM A213 TP304H Tubes
- Seamless Tubes
- Heat Exchanger Tubes
- Boiler Tubes
- Superheater Tubes
- U-Bend Tubes
- Cold Drawn Tubes
- Polished Tubes (180 / 240 / 320 / 400 Grit)
Applications
- High-Temperature Boilers
- Superheaters & Reheaters
- Heat Exchangers
- Petrochemical Plants
- Refinery Heaters
- Furnace Components
- Power Generation Plants
- Chemical Processing Industries
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