ASTM A213 TP347 Stainless Steel Seamless Pipe

What is ASTM A213 TP347?

ASTM A213 TP347 is a niobium-tantalum stabilized austenitic stainless steel seamless pipe, with better high-temperature stability than titanium-stabilized grades. It is widely used in nuclear, power and high-temperature process heat exchanger tubes.

Equivalent Grades (Horizontal)

UNS: S34700 | JIS: SUS347 | GB: 06Cr18Ni11Nb | EN: X6CrNiNb18-10 | W.Nr.: 1.4550

Chemical Composition (wt%, Horizontal)

C: ≤0.08 | 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

• Niobium-tantalum stabilization provides superior post-weld intergranular corrosion resistance and high-temperature stability • Excellent high-temperature creep resistance, suitable for long-term service up to 900°C • Good weldability and structural stability, no obvious performance degradation after welding • Ideal for nuclear power, high-temperature furnaces and critical process pipeline applications

TP347 vs TP321 (Horizontal)

Stabilizer: 347 (Nb+Ta) | 321 (Ti) | High-Temp Stability: 347 (Superior) | 321 (Good) | Creep Resistance: 347 (Better) | 321 (General) | Application: 347 (Nuclear/High-End) | 321 (General High-Temp)

UNS No	Grade	C	Si	Mn	P	S	Cr	Mo	Ni	N	Other
S34700	347	0.08	0.75	2.00	0.045	0.030	17.00/19.00	–	9.00/13.00	–	Cb:10xC1.00

 

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.