ASTM A312 TP347H Stainless Steel Seamless Pipe
Shape:Round
Outer Diameter (OD)：10.3 mm – 610 mm (1/8" to 24")
Wall Thickness (WT)：Sch 5S, 10S, 40S, 80S, 160, XXS (Up to 60mm)
Standard：ASTM A312, ASME SA312
Surface Finish：Annealed & Pickled (AP), Polished, or Bright Annealed (BA)
Heat Treatment：Solution Annealed: Min. 1095°C (2000°F) followed by rapid quenching.
Testing：Hydrostatic, Eddy Current, Ultrasonic, Grain Size, Flattening, Flaring
ASTM A312 TP347H pipe manufacturer China
GNEE supplies ASTM A312 TP347H (UNS S34709) stainless steel seamless pipes, a niobium-stabilized high-carbon austenitic heat-resistant stainless steel. With Nb ≥ 8×C and ≤ 1.10%, the material effectively prevents chromium carbide precipitation at temperatures above 540°C, thereby eliminating the risk of intergranular corrosion during long-term high-temperature service.
All our seamless pipes undergo online solution annealing at temperatures above 1100°C, followed by rapid water quenching, ensuring a fully stable microstructure free from harmful phases. At 650°C, the creep rupture strength is over 30% higher than 304H, with an oxidation resistance limit of 850–925°C and long-term pressure resistance up to 15 MPa.
GNEE utilizes high-precision cold drawing and cold rolling processes, achieving wall thickness tolerances significantly better than ASTM A312 requirements. Dimensional accuracy is tightly controlled (OD tolerance ±0.75%, WT tolerance +15% / –12.5%), providing excellent consistency for automated welding applications. We offer sizes ranging from OD 6–630 mm, WT 1.5–50 mm, and lengths of 6–12 m or customized.
Each TP347H seamless pipe is subjected to 100% ultrasonic testing (UT) and eddy current testing (ET), along with hydrostatic pressure testing, ensuring zero leakage risk. We provide Mill Test Certificates (MTC) and support SGS / EN 10204 3.2 certification, with clean, defect-free surface quality.
Compared to 304 and 321, TP347H pipes do not require post-weld solution annealing, offering a service life extended by 3–5 times and maintenance cost reductions exceeding 50%. They are widely used in boiler superheaters, petrochemical high-temperature pipelines, and power plant steam systems under severe high-temperature and high-pressure conditions.
If you require matching TP347H elbows or flanges, we can process them using raw materials from the same heat number, thereby ensuring welding compatibility throughout the entire system!
ASTM A312 Pipe Specification
| Item | Details |
|---|---|
| Country / Region | China |
| Product Name | ASTM A312 TP347H Stainless Steel Pipe |
| FOB Price | USD 2,000 – 4,200 / Ton (Min. Order: 1 Ton) |
| Port of Shipment | Tianjin, China |
| Payment Terms | L/C or T/T |
| Delivery Time | 7–15 days after payment |
| Packaging | Standard export package, suitable for all kinds of transport, or as required |
| Certificates | ISO 9001-2000, PED 97/23/EC, ASME, DNV |
| Outside Diameter (OD) | 16 – 228 mm |
| Wall Thickness (WT) | 0.4 – 30 mm |
| Length | 6000 mm, 12000 mm, or customized as required |
TP347H Stainless Steel Seamless Pipe Equivalents
| Standard | Grade | UNS | EN / DIN | JIS |
| ASTM A312 | TP347H | S34709 | 1.4912 | SUS347HTP |
Chemical Composition (Typical Weight %)
| Element | Carbon (C) | Manganese (Mn) | Silicon (Si) | Chromium (Cr) | Nickel (Ni) | Nb + Ta | P / S |
| Value (%) | 0.04 - 0.10 | ≤ 2.00 | ≤ 0.75 | 17.0 - 19.0 | 9.0 - 13.0 | 8xC min / 1.10 max | P≤0.045, S≤0.030 |
Mechanical Properties (at Room Temperature)
| Property | Value (Metric) | Value (Imperial) |
| Tensile Strength (Rm) | ≥ 515 MPa | ≥ 75 ksi |
| Yield Strength (Rp 0.2) | ≥ 205 MPa | ≥ 30 ksi |
| Elongation (A50mm) | ≥ 35% | ≥ 35% |
| Hardness (Rockwell B) | ≤ 90 HRB | ≤ 90 HRB |
| Hardness (Brinell) | ≤ 192 HBW | ≤ 192 HBW |
TP347H stainless steel pipe Applications
Power Generation: Boiler tubes, superheater tubes, and steam headers.
Petrochemical: High-temperature reactors, catalytic cracking units, and heat exchanger tubes.
Oil & Gas: Refinery piping and furnace components.
Aerospace: Rocket engine components and exhaust manifolds.
ASTM A312 TP347H Stainless Steel Pipe (Seamless and Welded) Price per kg
ASTM A312 TP347H stainless steel pipes (seamless and welded) generally range from approximately USD 3.75 to USD 8.00 per kg, depending on manufacturing technique, pipe size, and market fluctuations. High-temperature, high-pressure 347H seamless pipes, frequently used in power plants, can range closer to $5,500-$7,000 USD per ton ($5.5-$7.0 per kg)
inspection
Mandatory Process Testing: Hydrostatic Test, Flattening Test, and Flaring Test.
Non-Destructive Testing (NDT): 100% Ultrasonic Testing (UT) and 100% Eddy Current Testing (ET) to ensure the absence of pinholes or cracks within the tube wall.
Grain Size Testing: Must comply with ASTM E112 standards; typically, a grain size of No. 7 or coarser is required (to ensure high-temperature creep resistance).
Intergranular Corrosion Testing: Conducted in accordance with ASTM A262 Practice E to ensure that no intergranular corrosion occurs following welding.
TP347H pipe fast delivery supplier
Gnee has a large warehouse and a certain amount of stock of commonly used specifications of TP430/430, shortening the delivery time to 3-7 days. With strong cooperation background with steel mills (TISCO, Baosteel, ZPSS), it can provide highly competitive ex-factory prices.
high quality packaging
End Protection: Both ends of the pipes are fitted with plastic caps to prevent the ingress of dust and debris, as well as to guard against deformation of the pipe ends during transit.
Bundling Method: The pipes are arranged in hexagonal bundles, reinforced with steel strapping, and equipped with lifting slings to facilitate convenient handling and loading/unloading at ports.
Outer Protection: Each bundle is wrapped in a double layer of waterproof woven bags or stretch film to protect against salt spray corrosion during sea transport.
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