ASTM A376 TP347H Seamless Pipes For High-Temperature
Name：ASTM A376 TP347H Seamless Pipes for High-Temperature
Certification：ISO, RoHS, IBR, AISI, ASTM, GB, EN, DIN, JIS
Shape：round
Technique：Cold Rolled/Hot Rolled
Surface Treatment：Sanded /Mirror/Hairline Brushed
Thickness：0.3-30mm
out Diameter：8-219mm
Length：5.8/6m or Custom
Stock：in Stock
Sample：Available
Transport Package：Standard Sea-Worthy Packing
Send E-mail:info@gneestainless.com
Tel:+8615824687445
Description
Gnee Steel (Tianjin) Co., Ltd. is one of the most professional manufacturers and suppliers of astm a376 tp347h seamless pipes for high-temperature in China. With abundant experience, we warmly welcome you to wholesale customized astm a376 tp347h seamless pipes for high-temperature from our factory. For price consultation, contact us.
GNEE supplies high-quality ASTM A376 TP347H seamless pipes, a high-carbon nickel-chromium austenitic stainless steel that complies with the American Society for Testing and Materials (ASTM A376) standard. Specifically engineered for high-temperature and high-pressure environments, these pipes are manufactured using a seamless process-hot piercing + cold rolling/cold drawing + solution annealing + pickling-to ensure uniform wall thickness, absence of weld defects, and a smooth inner surface (roughness Ra ≤ 0.8μm), which enhances the efficiency of fluid conveyance under extreme conditions. Rigorous 100% eddy current testing (ET) or hydrostatic testing (≥5.0MPa, depending on specifications) is conducted to guarantee structural integrity.
TP347H stainless steel pipes achieve superior performance through the addition of niobium (Nb), which forms stable niobium carbides (NbC). This effectively prevents intergranular corrosion and enables the material to maintain exceptional creep strength and stress rupture resistance at elevated temperatures. Its high-temperature properties significantly outperform standard TP347 and TP304H, making it the ideal choice for critical components in ultra-supercritical and supercritical power plants, such as boilers, superheaters, and reheaters.
ASTM A376 TP347H Stainless Steel Seamless Pipe Application
Power Generation: Superheaters, reheaters, and boiler tubes in coal-fired/thermal plants.
Petrochemical: Catalytic cracker units, furnace manifolds, and reformer tubes.
Aerospace: Exhaust systems and heat exchangers.
Nuclear: Steam generator tubing and pressurizer components.
Industrial Processing: High-temperature fluid transfer systems.
Specification
ASTM A376 SS 347 Seamless Pipe Chemical Composition
| Grade | C | Ni | Si | N | S | Mn | P | Cr | Mo | |
| SS 347 | min. | 0.04 | 9.00 | – | – | – | – | – | 17.0 | 2.00 |
| max. | 0.10 | 13.00 | 1.00 | – | 0.030 | 2.00 | 0.045 | 20.0 | 3.00 |
ASTM A376 TP347H Stainless Steel Seamless Pipe Physical Properties
| Properties | Metric | Imperial |
| Density | 7.7 – 8.03 g/cm3 | 0.278 – 0.290 lb/in³ |
ASTM A376 347H stainless steel Pipe Mechanical Properties
| Grade | Tensile Strength (MPa) min | Elongation (% in 50mm) min | Yield Strength 0.2% Proof (MPa) min | Hardness | |
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| SS 347 | 515 | 35 | 205 | 92 | 201 |
TP347H Dimensional Tolerances
Manufactured to ASTM A376/A999 specifications：
| Parameter | Tolerance |
|---|---|
| Outer Diameter (OD) | ±0.75% for OD ≤ 48.3mm; ±0.50% for OD > 48.3mm |
| Wall Thickness | +20% / -12.5% |
| Length | +6mm / -0mm (for lengths ≤6m) |
| Straightness | 0.0015 × length (mm) |
Why Choose Our TP347H Seamless Pipes?
Precision cold-drawn/hot-finished for uniform wall consistency.
100% non-destructive testing (UT/ET) and hydrostatic certification.
Traceable mill test reports (MTRs) compliant with ASTM A376.
Custom sizes: OD 6mm–914mm, Wall Thickness 1.24–50mm.
Product Testing
The tests that stainless steel pipes undergo before leaving the factory include chemical composition, mechanical properties, dimensional accuracy, surface quality, non-destructive testing and corrosion resistance to ensure that they meet standards and usage requirements.
ASTM A376 TP347H seamless pipes supplier
Packaging
Protection: 1.Inter paper available 2.PVC protecting film available
Export Packing: Waterproof paper, and steel strip packed. Standard Export,Seaworthy Package.Suit for all kinds of transport,or as required.
Customer visit and sign the order
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