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ASTM A376 TP347H Seamless Tube Nb-Stabilized 515MPa Up to 900°C for Superheater Reheater Cracking Furnace

ASTM A376 TP347H Seamless Tube Nb-Stabilized 515MPa Up to 900°C for Superheater Reheater Cracking Furnace

  • ASTM A376 TP347H Seamless Tube Nb-Stabilized 515MPa Up to 900°C for Superheater Reheater Cracking Furnace
  • ASTM A376 TP347H Seamless Tube Nb-Stabilized 515MPa Up to 900°C for Superheater Reheater Cracking Furnace
  • ASTM A376 TP347H Seamless Tube Nb-Stabilized 515MPa Up to 900°C for Superheater Reheater Cracking Furnace
  • ASTM A376 TP347H Seamless Tube Nb-Stabilized 515MPa Up to 900°C for Superheater Reheater Cracking Furnace
ASTM A376 TP347H Seamless Tube Nb-Stabilized 515MPa Up to 900°C for Superheater Reheater Cracking Furnace
Product Details:
Place of Origin: CHINA
Brand Name: YUHONG SPECIAL STEEL
Certification: ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008.
Model Number: ASTM A376/ASME SA376 TP347H
Payment & Shipping Terms:
Minimum Order Quantity: 100KGS
Price: NEGOTIABLE
Packaging Details: Ply-wooden Case /Iron Case/ Bundle with plastic Cap
Delivery Time: 20-80
Payment Terms: L/C, T/T
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Detailed Product Description
Specification: ASTM A376/ASME SA376 TP347H Stainless Steel Seamless Tube Certification: ISO
Shape: Round Technique: Cold Drawn/ Cold Rolled
Surface Treatment: Annealed, Polished Etc. Package: Wooden Boxes Package
Highlight:

ASTM A376 TP347H seamless tube

,

Nb-stabilized stainless steel tube

,

high-temperature superheater reheater tube

 ASTM A376 TP347H Seamless Tube Nb-Stabilized 515MPa Up to 900°C for Superheater Reheater Cracking Furnace

 

ASTM A376/ASME SA376 is the standard specification for seamless austenitic steel pipe intended for high-temperature central station service, originally developed for piping in the electric-power generating thermal plants. TP347H is one of the designated H‑grades under this specification, specifically engineered for long‑term creep service in boilers and pressure vessels above 550°C (1022°F).
 
ASTM A376 TP347H seamless tube is the “go‑to” niobium‑stabilized stainless steel solution for creep‑controlled designs above 550°C, where conventional unstabilized grades (304H, 316H) risk sensitization and where higher carbon ensures coarser grain for superior creep resistance.

 

 

347 vs 347H Comparison:
Grade UNS C (%) Grain Size Primary Application
TP347 S34700 ≤0.08 Finer General service, moderate temperatures
TP347H S34709 0.04–0.10 ASTM No. 7 or coarser High‑temperature creep service (>550°C)

 

 

Chemical Composition
Element Min (%) Max (%) Function Description Standard Reference
C (Carbon) 0.04 0.1 Elevated carbon for coarse grain & creep strength ASTM A376
Mn (Manganese) — 2 Deoxidation, hot workability ASTM A376
P (Phosphorus) — 0.045 Cold brittleness control ASTM A376
S (Sulfur) — 0.03 Hot brittleness control ASTM A376
Si (Silicon) — 1 Oxidation resistance ASTM A376
Cr (Chromium) 17 19 Oxidation resistance & high‑temperature strength ASTM A376
Ni (Nickel) 9 13 Austenite structure stabilization ASTM A376
Nb (Niobium) + Ta (Tantalum) 8×C 1 Stabilization – prevents sensitization ASTM A376

 

 

Mechanical Properties
Parameter Requirement Standard Reference
Tensile Strength (Rm) ≥ 515 MPa (75 ksi) ASTM A376
Yield Strength (Rp0.2) ≥ 205 MPa (30 ksi) ASTM A376
Elongation (longitudinal, 50mm gage length) ≥ 35% ASTM A376
Hardness (Brinell) ≤ 223 HB ASTM A376
Hardness (Rockwell B) ≤ 95 HRB ASTM A376

 

Physical Properties
Parameter Value Unit Standard Reference
Density 7.7 – 8.03 g/cm³ ASTM A376
Elastic Modulus (20°C) ~195 GPa ASTM A376
Thermal Conductivity ~14.5 W/(m·K) ASTM A376
Coefficient of Linear Expansion (20–300°C) ~17.0 ×10⁻⁶/°C ASTM A376
Specific Heat Capacity (20°C) ~500 J/(kg·K) ASTM A376
Electrical Resistivity ~0.73 μΩ·m ASTM A376
Melting Range 1400 – 1425 °C ASTM A376

 

 

Application:

 

 

 

ASTM A376 TP347H Seamless Tube Nb-Stabilized 515MPa Up to 900°C for Superheater Reheater Cracking Furnace 0

  • Power Generation (core application): Superheaters and reheaters for supercritical and ultra‑supercritical power plant boilers; main steam piping; high‑temperature reheat piping

  • Petrochemical Industry: Ethylene cracking furnace tubes; hydrogen conversion furnace tubes; refinery furnaces; high‑temperature piping systems

  • Nuclear Industry: Non‑nuclear‑grade auxiliary piping systems within nuclear power plants requiring high‑temperature performance

  • Industrial Heating: Heat treatment equipment, expansion joints, aircraft exhaust manifolds

  • Heat Exchangers: High‑temperature thermal fluid piping and heat exchanger tube bundles exposed to cyclic thermal stress

Tag:

seamless stainless steel tube,

seamless boiler tubes,

stainless steel seamless pipes

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