ASTM A213 TP347H Stainless Steel Seamless Pipe

What is ASTM A213 TP347H?

ASTM A213 TP347H is the high-carbon niobium-tantalum stabilized austenitic stainless steel seamless pipe, designed for maximum high-temperature creep strength. It is used in critical high-temperature, high-pressure boiler and nuclear pipeline systems.

Equivalent Grades (Horizontal)

UNS: S34709 | JIS: SUS347H | GB: 07Cr18Ni11Nb | EN: X7CrNiNb18-10 | W.Nr.: 1.4550

Chemical Composition (wt%, Horizontal)

C: 0.04-0.10 | Si: ≤1.00 | Mn: ≤2.00 | P: ≤0.045 | S: ≤0.030 | Cr: 17.00-19.00 | Ni: 9.00-13.00 | Nb+Ta: ≥10×C | Fe: Balance

Key Properties (20°C, Annealed, Horizontal)

Density: 7.93g/cm³ | Melting Point: 1400-1450°C | Tensile Strength: ≥515N/mm² | Yield Strength: ≥205N/mm² | Elongation: ≥40% | Hardness: ≤201HB

Core Characteristics

• High carbon content combined with niobium-tantalum stabilization, delivering superior high-temperature creep strength (600-900°C) • Outstanding post-weld intergranular corrosion resistance, ensuring long-term service reliability • Mandatory post-weld annealing to optimize high-temperature performance and structural uniformity • Suitable for critical high-temperature pressure components in nuclear power plants and large boilers

TP347 vs TP347H (Horizontal)

Carbon Content: 347 (≤0.08%) | 347H (0.04-0.10%) | Creep Strength: 347 (Good) | 347H (Excellent) | Annealing: 347 (Optional) | 347H (Mandatory) | Application: 347 (General High-Temp) | 347H (Critical High-Stress)

 

Element	347	347H
Chromium	17.00 min.-19.00 max.	17.00 min.-19.00 max.
Nickel	9.00 min.-13.00 max.	9.00 min.-13.00 max.
Carbon	0.08	0.04 min.-0.10 max.
Manganese	2.00	2.00
Phosphorus	0.045	0.045
Sulfur	0.03	0.03
Silicon	0.75	0.75
Columbium & Tantalum	10 x (C + N) min.-1.00 max.	8 x (C + N) min.-1.00 max.
Iron	Balance	Balance

Stainless Steel Suppliers

If you have project requirements for stainless steel, we welcome your order. GNEE has a large inventory of popular products for you to choose from. It can be processed into various practical product forms, including plates, coils, tubes, bars, wires, etc. For detailed chemical composition information and free samples, please contact our factory immediately. We offer competitive prices and excellent service.Email: info@gneestainless.com

 

Testing and Documentation: Factory test certificate, EN 10204 3.1, chemical report, mechanical report, destructive testing report, non-destructive testing report, PMI test report, visual inspection report, third-party inspection report, NABL certified laboratory report.
Packaging: Wooden crate packaging, bubble wrap packaging, steel strapping, or packaging according to customer requirements.