If you are looking for durable seamless stainless steel pipes specifically designed for high-temperature, highly corrosive environments, we offer ASME SA376 TP347H Seamless Austenitic Steel Pipe for High-Temperature Service, widely used in boilers, heat exchangers, chemical equipment, and petrochemical pipelines.
ASME SA376 TP347H stainless steel pipe is a high-carbon austenitic stainless steel with added molybdenum and titanium elements, effectively inhibiting intergranular corrosion and improving high-temperature strength. This allows the pipe to maintain excellent creep resistance and structural stability in high-temperature environments of 500–900°C, making it suitable for various precision manufacturing and high-temperature piping systems.
Our 347H seamless pipes are manufactured in strict accordance with ASME SA376 / ASTM A312 standards, featuring uniform wall thickness and smooth inner and outer surfaces. Diameters range from 6mm to 500mm, and custom lengths are available to meet diverse industrial engineering needs.
ASME SA376 TP347H Seamless Austenitic Steel Pipe Stamping Process
Pipe Material Selection: ASME SA376 TP347H seamless austenitic stainless steel pipes, typically with diameters of 10–500mm and wall thicknesses of 2–40mm.
Surface Cleaning: Remove oil, rust, and scale to ensure a smooth stamping process.
Cutting: Cut the pipes to the required stamping size or workpiece length using common methods such as sawing, flame cutting, or laser cutting.
Positioning: Secure the pipe in the stamping die to ensure even stress distribution and prevent bending or misalignment.
Stamping Die: Design a dedicated die based on the part shape (e.g., flange, pipe cap, disc).
Annealing or Solution Treatment: Relieve stamping stress and restore material toughness and high-temperature performance.
Surface Treatment: Pickling, passivation, or polishing to improve corrosion resistance and surface quality.
Inspection: Conduct dimensional inspection, non-destructive testing (UT/MT/PT), and performance verification to ensure the parts meet high-temperature and high-pressure operating conditions.
Grade: TP304, TP304H, TP304LN, TP316, TP316H, TP316LN, TP347, TP347H, TP348, TP348H, TP321, 321H, S31725, S31726
Size: OD: 10.3-762mm WT: 1-50mm
Length: fixed length or random
Delivery condition: annealing/pickling/ passivization
Packaging: bundle, plywood case
Manufacture：pipe may be either hot finished or cold finished, with a suitable finishing treatment, where necessary.
| ASME/ASTM | EN/DIN | JIS | GB | ISO |
|
TP347H (UNS S34709) |
X8CrNiNb19-10 (1.4912) | SUS 347H TB / TP |
07Cr18Ni11Nb (347H) |
X8CrNiNb19-10 (1.4912) |
ASME SA376 TP347H Chemical Composition (%)
| C | Mn | P | S | Si | Cr | Ni | Co |
| 0.04-0.10 | ≤2.00 | ≤0.045 | ≤0.030 | ≤0.75 | 17.0~19.0 | 9.0~13.0 | 1.10 ≥Co≥ 0.8*C |
ASME SA376 TP347H Mechanical Properties
|
Tensile Strength |
Yield Strength | Elongation |
Transverse |
| ≥ 515MPa | ≥ 205MPa | ≥ 35% | ≥ 25% |
ASTM A376 TP347H Stainless Steel Seamless Pipe Application
1.Power Generation Industry (Core Application): Superheaters and reheaters for supercritical and ultra-supercritical power plant boilers, main steam piping, high-temperature reheat piping, and other heat exchange tube bundles subject to high temperatures and high pressures.
2.Petrochemical Industry: Ethylene cracking furnace tubes, hydrogen conversion furnace tubes, and other process piping for high-temperature environments.
3.Nuclear Industry: Certain non-nuclear-grade auxiliary piping systems within nuclear power plants that require high-temperature performance.
What is the difference between ASTM A213 and ASTM A376?
ASTM A213 and ASTM A376 are both specifications for steel tubing and piping, but they differ in their intended applications and material types. ASTM A213 covers seamless ferritic and austenitic alloy-steel boiler, superheater, and heat-exchanger tubes, while ASTM A376 covers seamless austenitic steel pipe intended for high-temperature service.
GNEE is an ISO-certified exporter of ASTM A376 pipes. We are a trusted distributor and supplier of ASTM A376 seamless pipes in your country. Our ASTM A376 TP304 and 316 seamless pipes are tested according to international standards and specifications such as DIN, JIS, EN, and ASTM.
Packing and Shipping:
All pipes are securely packed in wooden boxes or bundles with plastic caps to avoid damage during transit.
Each box/bundle is strapped with metallic strips for added strength.
Boxes/bundles are clearly labeled with product details and shipping marks for easy identification.
