ASTM A376 TP347H High-Temperature Seamless Steel Pipes
Shape：round
Technique：Cold 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
If you are looking for ASTM A376 TP347H (S34709) High-Temperature Stainless Steel Seamless Pipes capable of handling ultra-supercritical power units, high-pressure steam cycles, or high-temperature refinery operations, GNEE, with its extensive supply experience in the power and petrochemical industries, has become a core global supplier of high-temperature pressure piping.
GNEE supplies high-quality ASTM A376 TP347H stainless steel high-temperature pipes, which are seamless austenitic stainless steel tubes specifically designed for high-temperature service. Utilizing high-precision hot extrusion or cold drawing processes, we ensure dimensional tolerances that are significantly superior to industry standards. These pipes undergo precise solution annealing at 1050°C - 1150°C followed by rapid cooling to lock in the microstructure, ensuring excellent intergranular corrosion resistance in extreme environments ranging from 600°C to 800°C.
Our ASTM A376 347/347H seamless stainless steel pipes can be provided with either beveled or plain ends. The Outer Diameter (OD) ranges from 1/2 inch to 30 inches, with wall thickness schedules including SCH 5S, 10S, 40S, and 80S. We also offer customized average wall thicknesses tailored to specific customer requirements.
Furthermore, to meet the long-term high-temperature service requirements of the ASTM A376 standard, we strictly control the grain size of our 347H SS pipes to ASTM E112 No. 7 or coarser through optimized heat treatment. This significantly enhances the material's creep-rupture strength, ensuring a reliable service life under complex thermal stresses and rigorous operating conditions.
TP347H High-Temperature pipe Applications
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 /ASME SA376 | Standard Specification for Seamless Austenitic Steel Pipe for High-Temperature Service |
| Material Grade | TP347H |
| Size | 1/2''~48'' |
| Thickness | SCH5~SCHXXS |
| End | Beveled End,Plain End |
| Length | As per your requirement. |
| Packing | Export Standard packing or as per your requirements. |
TP347H stianless steel pipe Chemical Composition
| Element | Min (%) | Max (%) |
|---|---|---|
| Carbon (C) | 0.04 | 0.10 |
| Chromium (Cr) | 17.0 | 20.0 |
| Nickel (Ni) | 9.0 | 13.0 |
| Niobium (Nb) | 8×C min | 1.10 |
| Manganese (Mn) | - | 2.00 |
| Silicon (Si) | - | 0.75 |
| Phosphorus (P) | - | 0.045 |
| Sulfur (S) | - | 0.030 |
| Iron (Fe) | Balance | Balance |
TP347H SMLS pipe Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥515 MPa (75 ksi) |
| Yield Strength (0.2%) | ≥205 MPa (30 ksi) |
| Elongation (%) | ≥35% (50mm gauge length) |
| Hardness (Max) | 192 HB / 90 HRB |
| Test Temperature | Room Temperature (20°C) |
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) |
If you have a project need for ASTM A376 TP347H Seamless Steel Pipe, we welcome your order. GNEE has a large inventory of popular products for you to choose from. These products can be processed into a variety of practical product forms. For detailed chemical composition and free samples, please contact our factory today. We offer competitive pricing and excellent service.
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inspection
During the testing process, we implement 100% ultrasonic testing (UT) and eddy current testing (ET) as double safeguards, combined with high-pressure water pressure testing and hardness gradient analysis, to ensure that every pipe welded to the site can withstand rigorous thermal cycling. Furthermore, our TP347H pipes fully comply with ASME BPVC Section II and come with complete EN 10204 3.1/3.2 traceability certificates.
TP347 stainless steel Tube Factory
GNEE maintains a large inventory of seamless steel pipes conforming to ASTM A376 TP347H standards, with a full range of specifications, from 1/2 inch to 30 inch outer diameters and from SCH 10S to 80S wall thicknesses, offering an industry-leading 7-10 day rapid delivery cycle; while custom orders and large project requirements can be efficiently completed within 30-45 days.
high quality packaging
Packed in bundles or ply wooden box wrapped in plastic, and suitably protected for sea-worthily delivery or as requested.
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