TP347H Seamless Tube, ASTM A312 TP347H Seamless steel Tube, ASTM A213 TP347H Seamless Tube, TP347H Boiler Tube, TP347H Heater Tube, UNS S34709 Tube, TP347H Seamless Austenitic Stainless Steel Tube
ASTM A213 TP347H tube is a high-temperature stabilized stainless steel seamless tube suitable for use in boilers and heat exchangers.
Alloy 347H (UNS S3409) is a high-carbon material (C: 0.04% - 0.10%), that retains excellent strength during service at temperatures up to 1000°F (537°C).
347H steel tube also contains niobium, thereby imparting excellent resistance to intergranular corrosion, oxidation, and creep.
We at HT PIPE are a global supplier of 347H stainless steel material. We not only provide pipes, plates, round bars, but also pipe fittings, flanges, etc. We offer competitive price and customized services; contact us today to receive a free quotation!
ASTM A213 TP347H Stainless Steel Pipes and Tubes Specifications
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Grades
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SS 347H / UNS S34709 / 1.4961/ 18Cr-10Ni-Cb / EN X6CrNiNb18-12
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Specification
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ASTM A213/ ASME SA 213, ASTM A312/ ASME SA 312
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Seamless Pipes Size
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Outer Diameter: 4 to 219mm
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Wall Thickness: 0.5 to 20mm
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Wall Thickness
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Schedule 5, Schedule 40, Schedule10, Schedule 80, Schedule 160, Schedule 80S, Schedule XXS, Schedule XS
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techniques
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Seamless
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Form
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Round, Square, Rectangular
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Length
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Double Random & Required Length End, Single Random, Plain End, Treaded, Beveled End
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Condition
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Hot Finished, Annealed, Pickled, and Passivated, Bright Annealed, Polished, Cold Drawn
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Certificate
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Inspection certificate per 3.1 EN 10204-2004
No. AMM-03-TU-008 NEFTEKHIMPROJECT
Raw Materials Certificate
100% Radiography Test Report
Third Party Inspection Report, etc
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ASME SA 213 TP347H Tube Chemical Composition
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Grade
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C
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Nb
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Ni
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P
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S
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Cr
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Mn
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Si
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Fe
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SS 347H
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0.04 – 0.10
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8xC – 1.10
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9.0 -13.0
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0.045 max
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0.030 max
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17.00 - 19.00
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2.0 max
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1.0 max
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63.72 min
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The TP347H seamless tubes supplied by HT PIPE are strictly controlled to have a grain size of No. 7 or coarser (ASTM E112), and each batch undergoes 100% PMI testing to ensure the correct ratio of niobium (Nb) to carbon (C).
SS 347H Mechanical Properties
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Tensile strength (σ₀)
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≥ 515 MPa
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Yield strength (σ₀.₂)
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≥ 205 MPa
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Elongation over 50 mm gauge length
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≥ 35%
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Hardness
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≤ 90 HRB
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Grain size
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ASTM E112 No. 7
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SS347h Material Heat Treatment
Hot Finished: Solution treatment ≥ 1050°C, rapid cooling
Cold Finished: Solution treatment ≥ 1100°C, rapid cooling
AISI 347H Tube Applications:
Boiler tubes and furnace shells
Oil and gas pipelines
Superheaters
High-pressure steam piping
Heat exchanger tubes
Aircraft exhaust systems
Power plants, refineries, petrochemical facilities, etc.
Alloy 347h Pipe Testing HT can Provide
100% Visual Inspection
100% Dimensional Inspection
100% PMI Chemical Analysis
Flaring Test, Flattening Test: Performed to ASTM A1016M
100% Ultrasonic Testing (UT): Standard ASTM E999-14 / ASTM E213-13
Eddy Current Testing: Standard ASTM A999 / ASTM A426
Intergranular Corrosion Test (IGC): Performed to ASTM A262-13
Buy TP347H Seamless Tube
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Item No.
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Especificaciones (diámetro exterior × espesor de pared)
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Length (mm)
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1
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88.9 × 13.2 mm
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4050
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2
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88.9 × 13.2 mm
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3430
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3
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88.9 × 13.2 mm
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7340
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4
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88.9 × 13.2 mm
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6000
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FAQ:
What is TP 347 material?
TP347H is a niobium (Nb)-stabilized stainless steel tube that offers resistance to intergranular corrosion within the temperature range of 427–816°C (800–1500°F). It is widely used in industries such as oil refining, boiler manufacturing, petrochemicals, aviation, and paper production.
What is the difference between 347 and 347H?
Grade 347H stainless steel is a high-carbon version of 347.
347: C ≤ 0.08%; suitable for general high-temperature applications.
347H: C = 0.04–0.10%; suitable for high-temperature service conditions exceeding 1000°F.
What is the difference between 347H and 316H?
347H: Contains the stabilizing element niobium (Nb); its primary advantages lie in its high-temperature creep strength and resistance to intergranular corrosion.
316H: Contains the element molybdenum (Mo); it offers superior resistance to marine environments, chlorides, pitting corrosion, and crevice corrosion.
What is the maximum temperature for 347H?
1650°F–1700°F
Continuous service: Up to 899°C (1650°F)
Intermittent service: Up to 925°C (1700°F)
What temperature is annealing 347H?
1850 to 2000°F
Solution Annealing: 1010–1193°C (1850–2000°F), followed by rapid water quenching to restore corrosion resistance.
