ASTM A269 TP348H Stainless Steel Tubes (UNS S34800)
ASTM A269 TP348H (UNS S34800) Stainless Steel Tubes are high-carbon, niobium-stabilized austenitic stainless steel tubes designed for exceptional high-temperature strength and resistance to intergranular corrosion. TP348H is similar to TP347H but offers improved stability due to controlled niobium addition and increased carbon content. These tubes are ideal for use in environments where prolonged exposure to elevated temperatures is expected, such as refineries, petrochemical plants, boilers (non-pressure), and heat exchanger systems.
Engineered to withstand severe thermal cycling and high-stress conditions, TP348H tubes deliver excellent performance, making them suitable for critical industrial applications.
Key Features
- High-Carbon Grade ensures superior creep resistance and stress rupture strength.
- Niobium (Nb) Stabilization provides excellent resistance to intergranular corrosion.
- Enhanced High-Temperature Performance compared to TP347.
- Outstanding Oxidation Resistance up to 870°C (1600°F).
- Excellent Weldability with minimal carbide precipitation.
- Good Mechanical Strength at elevated as well as low temperatures.
- Ideal for Long-Term High-Temperature Industrial Applications.
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | S34800 |
| WNR | 1.4551 |
| EN | X10CrNiNb18-10 |
| JIS | SUS 348H |
| Related Grade | TP347H |
Available Sizes
- Outer Diameter (OD): 3.2 mm – 114.3 mm
- Wall Thickness: 0.5 mm – 12 mm
- Length: Up to 12 meters
- Custom Dimensions supplied upon request
ASTM A269 TP348H Chemical Composition
| Element | % Composition |
|---|---|
| Carbon (C) | 0.04 – 0.10 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 0.75 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 13.0 |
| Niobium + Tantalum (Nb + Ta) | 10 × C to 1.0 |
| Nitrogen (N) | ≤ 0.10 |
ASTM A269 TP348H Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2% Proof) | ≥ 205 MPa |
| Elongation | ≥ 35% |
| Hardness (Rockwell B) | ≤ 92 HRB |
| Density | 8.0 g/cm³ |
ASTM A269 TP348H Physical Properties
| Property | Value |
|---|---|
| Melting Point | 1400 – 1425°C |
| Thermal Conductivity | 16.3 W/m-K (at 100°C) |
| Electrical Resistivity | 0.72 µΩ-m |
| Thermal Expansion | 16.6 × 10⁻⁶ /°C |
| Modulus of Elasticity | 193 GPa |
Types of ASTM A269 TP348H Stainless Steel Tubes
- Seamless Tubes
- Welded Tubes
- Bright Annealed (BA) Tubes
- Electropolished Tubes
- Heat Exchanger Tubes
- Condenser Tubes
- Instrumentation Tubes
- Capillary Tubes
- U-Bent Tubes
- Hydraulic Tubes
Applications
- Oil & Gas Refinery Units
- Petrochemical Processing Equipment
- Heat Exchangers & Condensers
- Boiler Tubing (Non-pressure applications)
- Superheater Tubes
- Furnace Components
- Thermal Processing Systems
- Hot Gas Ducts & Exhaust Systems
- Power Plant Applications
- Pharmaceutical & Food Processing Pipelines
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