ASTM A376 TP347H Seamless Stainless Steel Pipe For Petrochemical Industry
Sep 28, 2025
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ASTM A376 specification covers seamless austenitic steel pipe for high-temperature central station service. Covered grades include five H-grades and two nitrogen-graded grades. The pipe can be heat-treated or cold-finished with appropriate finishing.
We offer ASTM A376 TP 347/347H seamless stainless steel pipe in various sizes, ranging from 1/2-inch to 30-inch outside diameter. Wall thicknesses include SCH5S, 10S, 40S, and 80S, with average wall thickness available upon request. We offer ASTM A376 347/347H seamless stainless steel pipe manufactured using a cold finishing process, followed by heat treatment, pickling, and passivation. Pipe ends may be beveled or smooth-faced.
ASTM A376 TP 347/347H Seamless Stainless Steel Pipe
| Standard | ASTM A376 |
|---|---|
| Stainless Steel | 304, 316, 321, 347, 347H |
| Pipe Type | Seamless Pipe |
| Finishes | Annealed pickling, bright annealing |
| Outside Diameter | 1/8 Inch To 30 Inch, NPS |
| Thickness | Sch 5, Sch 5S, Sch 10S, Sch 40S, Sch 80S, Sch 160 |
| Application | high-temperature central-station service |
ASTM A376 SS 347 stainless steel 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 Pipe Physical Properties
| Properties | Metric | Imperial |
| Density | 7.7 – 8.03 g/cm3 | 0.278 – 0.290 lb/in³ |
ASTM A376 347H Seamless 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 |
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.
Industrial Heating: Heat treatment equipment and furnaces.
ASTM A376 pipe is delivered in the heat-treated condition unless the purchase order specifically specifies no final heat treatment. Tensile tests, water pressure tests, non-destructive electrical testing, ultrasonic testing, eddy current testing, tensile tests and flattening tests shall all comply with the specified requirements.
Packaging and Marking:
Packaged in bales or laminated wooden crates, wrapped in plastic, and appropriately protected to ensure airworthiness for transport, or as required.
Marking must comply with specifications A376/A376M and include information on whether the pipe is hot-finished or cold-finished, including but not limited to: standard, grade, size, heat number, and batch number.
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