ASTM A312 TP348 Austenitic Stainless Steel Pipes (UNS S34800)
ASTM A312 TP348 (UNS S34800) is a niobium-stabilized variant of 304/347 stainless steel, designed to provide exceptional resistance to intergranular corrosion, particularly after welding or exposure to elevated temperatures. TP348 offers strong mechanical stability, superior oxidation resistance, and enhanced performance in corrosive and high-temperature service environments. It is widely used in chemical, petrochemical, and thermal applications requiring long-term durability.
Key Features
- Niobium-stabilized for superior intergranular corrosion resistance
- Excellent mechanical strength and thermal stability
- Enhanced oxidation and creep resistance at high temperatures
- Good resistance to chloride-induced stress corrosion cracking
- Excellent weldability and formability
- Suitable for corrosive and high-temperature environments
- Available in seamless, welded, and EFW pipe types
- Reliable performance in pressure and heat-intensive systems
Equivalent Grades
| Standard | Grade |
|---|---|
| ASTM | TP348 |
| UNS | S34800 |
| WNR | 1.4912 (Approximate) |
| EN | Nearest Equivalent: X7CrNiNb18-10 Modified |
Available Sizes
- Outer Diameter (OD): 6 mm to 610 mm
- Wall Thickness: 1.2 mm to 60 mm
- Nominal Bore: 1/8” NB to 24” NB
- Lengths: Single Random, Double Random, Custom up to 12 meters
ASTM A312 TP348 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.08 max |
| Manganese (Mn) | 2.00 max |
| Silicon (Si) | 1.00 max |
| Chromium (Cr) | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 13.0 |
| Niobium (Nb/Cb) | ≥ 10 × C (%) and ≤ 1.00% |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.030 max |
| Nitrogen (N) | 0.10 max |
| Iron (Fe) | Balance |
ASTM A312 TP348 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2% Proof) | ≥ 205 MPa |
| Elongation | 35% min |
| Hardness | ≤ 95 HRB |
| Modulus of Elasticity | ~193 GPa |
ASTM A312 TP348 Physical Properties
| Property | Value |
|---|---|
| Density | 7.90 g/cm³ |
| Melting Range | 1398 – 1450°C |
| Thermal Conductivity | 16.3 W/m·K (100°C) |
| Electrical Resistivity | 0.78 µΩ·m |
| Coefficient of Expansion | 16.5 µm/m°C (20–100°C) |
Types of TP348 Stainless Steel Pipes
- Seamless Stainless Steel Pipes
- Welded Stainless Steel Pipes
- EFW Stainless Steel Pipes
- Round Pipes
- Square Pipes
- Rectangular Pipes
- Heat Exchanger & Condenser Pipes
- Superheater & Reheater Tubes
- Custom Fabricated Pipes
Applications
- Chemical & petrochemical processing plants
- High-temperature boilers & steam systems
- Heat exchangers and condensers
- Furnace & thermal processing components
- Oil & gas refinery pipelines
- Food & pharmaceutical equipment
- Marine & offshore environments
- Pulp & paper processing
- Power generation & turbine systems
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