ASTM A312 TP304H Stainless Steel Pipes
ASTM A312 TP304H is a high-carbon modification of the standard 304 stainless steel grade, designed specifically for high-temperature and high-pressure applications. The increased carbon content improves its creep strength, stress rupture resistance, and heat resistance, making it an excellent choice for boilers, heat exchangers, superheaters, petrochemical piping, and refinery heating systems.
TP304H stainless steel pipes are available in Seamless, Welded, ERW & EFW forms and comply with ASTM A312 / ASME SA312 standards, ensuring superior performance, durability, and long service life in elevated temperature environments.
Key Features
- High Carbon Version of 304 for enhanced high-temperature strength
- Excellent Creep & Stress-Rupture Resistance
- Superior Corrosion Resistance in oxidizing environments
- Outstanding Weldability with heat-resistant stability
- Reliable Performance from ambient to 800–900°C
- Ideal for Boilers & Heat Exchanger Tubing
- Long-lasting Durability in high-pressure conditions
- Available in Wide Range of Schedules & Sizes
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| UNS | S30409 |
| EN / DIN | 1.4948 |
| JIS | SUS 304H |
| BS | 304H |
| GOST | 08X18H10H |
Available Sizes
| Type | Size Range |
|---|---|
| Seamless | 1/8″ NB to 24″ NB |
| Welded | 1/2″ NB to 48″ NB |
| Wall Thickness | 1.5 mm to 50 mm |
| Schedules | SCH 5, 10, 40, 80, 160, XXS |
| OD Range | 6mm – 1219mm |
ASTM A312 TP304H Chemical Composition
| Element | % Composition |
|---|---|
| Carbon (C) | 0.04 – 0.10 |
| Manganese (Mn) | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Silicon (Si) | ≤ 1.00 |
| Chromium (Cr) | 18.0 – 20.0 |
| Nickel (Ni) | 8.0 – 11.0 |
| Nitrogen (N) | ≤ 0.10 |
| Iron (Fe) | Balance |
ASTM A312 TP304H Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2% Proof) | ≥ 205 MPa |
| Elongation | ≥ 40% |
| Hardness (Brinell) | ≤ 201 HB |
| Hardness (Rockwell B) | ≤ 92 HRB |
ASTM A312 TP304H Physical Properties
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ |
| Melting Point | 1400–1450°C |
| Thermal Conductivity | 16.2 W/m·K |
| Expansion Coefficient | 17.3 µm/m°C |
| Electrical Resistivity | 0.72 µΩ·m |
| Modulus of Elasticity | 193 GPa |
Types of TP304H Stainless Steel Pipes
- Seamless Pipes
- Welded Pipes
- ERW Pipes
- EFW Pipes
- Round Pipes
- Square & Rectangular Pipes
- Heat Exchanger Tubes
- Superheater & Boiler Pipes
- Polished Pipes (Grain 180–600)
Applications
- Power Generation Plants
- Boilers & Superheater Systems
- Petrochemical Processing
- Refineries & Thermal Plants
- Chemical Fertilizer Industry
- Heat Exchangers & Condensers
- Nuclear & Thermal Energy Systems
- Steam Piping & Pressure Vessels
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