ASTM A376 TP347H Seamless Austenitic Steel Pipe for Power Plant
ASTM A376 TP347H is a specification for seamless austenitic stainless steel tubing designed for high-temperature environments. It is a niobium-stabilized steel with a higher carbon content (H grade) than standard 347, resulting in superior resistance to creep and intergranular corrosion at high temperatures. This makes it suitable for demanding applications such as power generation and petrochemicals.
Our ASTM A376 347/347H seamless stainless steel tubing is manufactured using cold working processes and undergoes heat treatment, pickling, and passivation. Ends are available in bevel or flush. Outer diameter (OD) ranges from 1/2 inch to 30 inches, and wall thickness grades are available in SCH5S, 10S, 40S, and 80S, with custom average wall thicknesses also available upon request.
What is the difference between 347 and 347H?
The main difference between stainless steel 347 and 347H fasteners is their carbon content. Stainless steel 347H has a higher carbon content than 347, which improves its high-temperature strength and makes it more suitable for applications with elevated temperatures.
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. |
ASTM A376 SS 347 Seamless Pipe Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.04–0.10 |
| Chromium (Cr) | 17.0–19.0 |
| Nickel (Ni) | 9.0–13.0 |
| Manganese (Mn) | ≤2.0 |
| Silicon (Si) | ≤1.0 |
| Phosphorus (P) | ≤0.045 |
| Sulfur (S) | ≤0.030 |
| Niobium (Cb) | 10×C to 1.0 |
ASTM A376 347H Seamless Pipe Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥515 MPa (75 ksi) |
| Yield Strength (0.2%) | ≥205 MPa (30 ksi) |
| Elongation | ≥35% |
| Hardness (Brinell) | ≤223 HB |
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 |
Applications
Power Generation: Boilers, heat exchangers, and superheater tubes in power plants.
Petrochemical Industry: Refinery furnaces, chemical processing units, and high-temperature piping systems.
Aerospace: Components requiring high-temperature resistance.
Testing and Inspection
With 18 years of experience in pipe manufacturing, GNEE is a trusted supplier of stainless steel pipes. The factory not only produces annealed steel pipes in standard sizes but also offers extended lengths of 18 meters and 25 meters to meet diverse customer needs. The factory is fully equipped, including cold rolling mills, smokeless furnaces, immersion tanks, ultrasonic eddy current cleaning machines, and physical and chemical laboratories.
Highest quality packaging and shipping
Packaging: Each tube is wrapped in moisture-proof paper, lined with plastic film, and secured with steel straps. The outer layer is protected by a wooden pallet or crate to ensure safety during international transport.
Identification: Each package includes the furnace number, grade, dimensions, and standard information.
Customer Visit
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