ASTM A312 TP321H Austenitic Stainless Steel Pipe
ASTM A312 TP321H is a titanium-stabilized austenitic stainless steel designed specifically for high-temperature service. The “H” grade indicates higher carbon content, ensuring superior creep resistance, stress rupture strength, and elevated-temperature performance. UNS S32109 provides excellent resistance to intergranular corrosion and oxidation in continuous service up to 900°C.
These properties make TP321H ideal for heat exchangers, boilers, refinery tubes, superheaters, and high-temperature fluid transport.
Key Features
- UNS S32109 titanium-stabilized high-temperature stainless steel
- Excellent creep strength & stress rupture resistance
- Higher carbon content for improved elevated-temperature mechanical strength
- Outstanding intergranular corrosion resistance
- Superior oxidation resistance up to 900°C
- Good weldability & formability
- Ideal for continuous and intermittent high-temperature applications
- Available in seamless, welded, and EFW pipe forms
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| ASTM | TP321H |
| UNS | S32109 |
| WNR | 1.4878 |
| EN | X6CrNiTi18-10 (H Variation) |
| JIS | SUS 321H |
Available Sizes
Outside Diameter (OD):
-
6 mm to 610 mm
Wall Thickness:
-
1.0 mm to 60 mm
Nominal Bore (NB):
-
½” NB to 24” NB
Pipe Lengths:
- Up to 12 Meters
- Custom cut-to-length available
ASTM A312 TP321H Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.04 – 0.10 |
| Manganese (Mn) | 2.00 max |
| Silicon (Si) | 0.75 max |
| Chromium (Cr) | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 12.0 |
| Titanium (Ti) | ≥ 5 × C content, typically 0.20 – 0.80 |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.030 max |
| Nitrogen (N) | 0.10 max |
| Iron (Fe) | Balance |
ASTM A312 TP321H Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2% Offset) | ≥ 205 MPa |
| Elongation | 35% min |
| Hardness | ≤ 95 HRB |
ASTM A312 TP321H Physical Properties
| Property | Value |
|---|---|
| Density | 7.90 g/cm³ |
| Melting Point | 1398 – 1440°C |
| Thermal Conductivity | 16.3 W/m·K (at 100°C) |
| Electrical Resistivity | 0.73 µΩ·m |
| Coefficient of Expansion | 16.6 µm/m°C (20–100°C) |
Types of TP321H Stainless Steel Pipes
- Seamless Pipes
- Welded Pipes
- EFW Pipes
- Round Pipes
- Square Pipes
- Rectangular Pipes
- Heat Exchanger Tubes
- Instrumentation Tubes
- U-Bend Tubes
- Custom Fabricated Pipes
Applications
- Petrochemical & Refinery Industries
- High-Temperature Boiler Tubes
- Heat Exchangers & Superheaters
- Steam Pressure Vessels
- Thermal Power Plants
- Furnace & Heater Tubes
- Chemical Process Piping
- Oil & Gas Transmission Lines
- Aerospace & Exhaust Systems
- Pharmaceutical & Food Processing (heat zones)
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