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ASME SA213 TP347H ASTM A213 TP347 TP347H Stainless Steel Tubes

Stainless Steel Tube

TP347 / TP347H is a stabilized austenitic stainless steel designed for high-temperature service. Key features include:

  • High-Temperature Strength: Resists creep and oxidation up to 800°C (1472°F).
  • Stabilization with Niobium (Nb): Minimizes carbide precipitation and intergranular corrosion.
  • Corrosion Resistance: Excellent resistance to oxidation, sulfidation, and chloride stress corrosion.
  • Weldability: Suitable for most welding methods but requires post-weld stabilization.

ASME SA213 TP347H Chemical Composition (wt%)

ElementCMnSiPSCrNiNb
Range0.04–0.10≤2.00≤1.00≤0.045≤0.03017.0–20.09.0–13.08×C–1.10

ASME SA213 TP347H Mechanical Properties

PropertyValue
Tensile Strength≥515 MPa (≥75 ksi)
Yield Strength (0.2% offset)≥205 MPa (≥30 ksi)
Elongation (50mm)≥35%

ASME SA213 TP347H Physical Properties

PropertyValue
Density8.0 g/cm³
Melting Range1400–1450°C (2552–2642°F)
Thermal Expansion (20–100°C)16.6 μm/m·°C
Thermal Conductivity15 W/m·K (at 100°C)
Specific Heat Capacity500 J/kg·K (at 20°C)

ASME SA213 TP347H Applications

  • Boiler superheaters/reheaters in power plants. (Bolier Tubes)
  • Heat exchangers and refinery tubing in petrochemical industries. (Heat Exchanger Tubes)
  • High-temperature piping in nuclear reactors.
  • Aerospace exhaust systems.

Related Grades

  • EN 1.4961 (European equivalent)
  • ASTM A312 TP347H (seamless pipe standard)
  • UNS S34709 (Unified Numbering System).

Heat Treatment

  • Solution Annealing: 1050–1150°C (1922–2102°F), followed by rapid cooling (water/quenching).
  • Stabilization Annealing: Optional at 850–950°C (1562–1742°F) for 2–4 hours to enhance intergranular corrosion resistance.

Precautions for Use

  1. Avoid Sensitization: Prolonged exposure to 425–860°C (797–1580°F) may cause carbide precipitation.
  2. Welding: Use low-carbon filler materials (e.g., ER347) and post-weld stabilization annealing.
  3. Chloride Exposure: Limit use in chloride-rich environments to prevent stress corrosion cracking.
  4. Thermal Cycling: Ensure proper support to mitigate thermal fatigue.
  5. Inspection: Regular NDT (e.g., ultrasonic testing) for high-pressure applications.

Reference Standards

  • ASME SA213 (Material specification for seamless ferritic/austenitic boiler tubes).
  • ASTM A1016 (General requirements for TP347H tubes).
ASME SA213 TP316L

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