ASTM A312 Grade 347H Stainless Steel Pipe
Material：Stainless Steel
Section Shape：Round
Od：1/8"-20"
Delivery Condition：Solution Annealed and Pickled
Pipe End：Plain End/Beveled End/Threaded End
Transport Package：Both Side with End Caps
Supplier of ASTM A312 Grade 347H Cold‑Rolled SS Pipes
Our ASTM A312 TP347H stainless steel pipes (UNS S34700 / DIN 1.4550) are manufactured based on Grade 304 austenitic alloy. Stabilized by the addition of niobium (Nb), they deliver enhanced resistance to intergranular corrosion and exhibit outstanding performance under high‑temperature conditions (700–900 °C) and oxidizing environments. Compared with standard Grade 304 stainless steel, ASTM A312 TP347H seamless pipes feature over 30 % higher creep strength and superior stress‑rupture properties. Capable of withstanding a working pressure up to 15 MPa, these pipes are well‑suited for extreme high‑temperature and high‑pressure service conditions.
Our ASTM A312 TP347H stainless steel pipes are produced by the cold‑drawing process, which brings work‑hardening characteristics. Cold deformation increases strength by 20 %‑30 % while maintaining an elongation of ≥40 %, satisfying stringent requirements for machining and forming. When matched with ER347 filler wire, the pipes allow all‑position welding, and welded joints can pass intergranular corrosion tests. They are particularly suitable for weld‑dense applications such as storage tanks and valves.
As an enterprise focusing on manufacturing and exporting premium ASTM A312 TP347H stainless steel pipes, GNEE's factory is equipped with advanced machinery and tools to boost production efficiency. We maintain adequate stock to supply stainless steel pipes in a broad range of sizes, standards and specifications, with custom‑dimension services also available.
ASTM A312 Grade 347H Pickled SS tube
ASTM A312 347H Cold‑Rolled SS Pipes
ASTM A312 347H SS tube
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Are you looking for seamless or welded pipe?
What is the operating temperature and pressure of your system?
ASTM A312 TP347H hot finished pipe Specification
Chemical Composition (Weight %) of ASTM A312 TP347H tube
| Element | Min. | Max. |
|---|---|---|
| C | – | 0.10 |
| Cr | 17.0 | 19.0 |
| Ni | 9.0 | 13.0 |
| Nb | 10×C% | – |
| Mn | – | 2.0 |
| Si | – | 1.0 |
| P | – | 0.045 |
| S | – | 0.030 |
SS 347h Pipe Mechanical Properties
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | |
|---|---|---|---|---|---|
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| 347H | 515 | 205 | 35 | 92 | 201 |
Stainless Steel 347H Tube Physical Properties
| Grade | Density (kg/m3) | Elastic Modulus (GPa) | Mean Coefficient of Thermal Expansion (m/m/0C) | Thermal Conductivity (W/m.K) | Specific Heat 0-1000C (J/kg.K) | Electrical Resistivity (n.m) | |||
|---|---|---|---|---|---|---|---|---|---|
| 0-1000C | 0-3150C | 0-5380C | at 1000C | at 5000C | |||||
| 347H | 8000 | 193 | 15.9 | 16.2 | 17.0 | 14.2 | 18.7 | 500 | 740 |
Available Types & Sizes
| Type | Size Range | Wall Thickness |
|---|---|---|
| Seamless Pipe | OD: 1/8"–12" (6.35–304.8 mm) Length: Single/Double Random, Cut-to-Length |
Sch 5–XXS (0.6–12.7 mm) |
Stainless Steel 347H Seamless Tubes Surface Finish
| Surface Finish | Internal Surface(ID) | Exterbal Surface(OD) | |||
|---|---|---|---|---|---|
| Roughness Average(RA) | Roughness Average(RA) | ||||
| μ inch | μm | μ inch | μm | ||
| AP | Annealed & Pickled | Not defined | Not defined | 40 or Not defined | 1.0 or Not defined |
| BA | Beight Annealed | 40,32,25,20 | 1.0,0.8,0.6,0.5 | 32 | 0.8 |
| MP | Mechanical Polish | 40,32,25,20 | 1.0,0.8,0.6,0.5 | 32 | 0.8 |
| EP | Electro Polish | 15,10,7,5 | 0.38,0.25,0.20;0.13 | 32 | 0.8 |
Stainless Steel 347H Tube Price
Price of SS 347H Seamless Tube ASTM A312 TP 347H: $ 5500 ~ $ 7000 USD/Ton
Price of SS 347H ERW/Welded Tube ASTM A312 TP 347H: $ 5000 ~ $ 6500 USD/Ton
SS 347H tube Typical Applications:
Heat exchangers, High‑temperature steam service, High‑temperature chemical processes,ect.
If you need specific technical data, let me know if you are looking for:
Mechanical property limits (tensile or yield strength)
Available size ranges and schedules
Packaging of TP347H SS Pipes
Our packaging adopts a multi‑layer anti‑rust design. Pipe ends are first sealed with protective caps to block water ingress; each pipe is wrapped with anti‑rust paper and waterproof film both inside and out. Cushion pads are placed between pipes to prevent scratches, and the products are finally packed in fumigated wooden cases. Even after one or two months of ocean shipping, the pipes are unlikely to rust or deform. Material grades and specifications are marked on every case to simplify inventory checking upon receipt.
Quality Management of TP347H SS Pipes
Our stainless steel pipes undergo full-process multi-dimensional quality inspection: raw materials are first verified for chemical composition via PMI spectral analysis, while finished products are subjected sequentially to hydrostatic tests and eddy current flaw detection to identify cracks and pores. After production, outer diameter tolerance, wall thickness tolerance and surface roughness are sampled and inspected. EN10204 3.1/3.2 material certificates and third-party test reports are available for each batch, enabling full traceability of quality.
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Export Cases
GNEE exports ASTM A312 TP347H stainless steel pipes to multiple countries for applications in chemical engineering, power plants and other industries.
| No. | Export Country/Region | Order Date | Product Specifications & Applicable Standards | Application Scenarios |
|---|---|---|---|---|
| 1 | Malaysia | April 2026 | ASTM A312 TP347H seamless pipes, Φ89×8 mm, solution‑annealed, pickled and precision cold‑drawn | High‑temperature process piping for petrochemical hydrogenation units (long‑term service in sulfur‑bearing media at 550–620℃) |
| 2 | Turkey | January 2026 | ASTM A312 TP347H thick‑wall welded pipes in Sch40s schedule, manufactured by TIG welding plus integral solution annealing | Boiler superheater and reheater tube bundles in thermal power plants |
| 3 | Singapore | August 2025 | ASTM A312 TP347H cold‑rolled precision small‑diameter thin‑wall pipes | Flue gas heat exchange systems of waste‑to‑energy power stations |
FAQ
1.What are the key differences between 347h and 316h stainless steel?
316 offers superior corrosion resistance in chloride and marine environments, while 347 excels in high-temperature resistance and is immune to intergranular corrosion
2.What is the difference between 347H stainless steel pipe and Type 316 stainless steel pipe?
Grade 347 and grade 316 stainless steel differ primarily in their alloying elements, making 316 better for marine and chloride corrosion resistance, while 347 excels in high-temperature stability and heavy-duty welding
3.Is 347 stainless steel magnetic?
Grade 347 stainless steel is non-magnetic in its standard annealed condition, but it can become slightly magnetic after cold working
4.What is 347 stainless used for?
CarTech 347 stainless should be considered for applications requiring intermittent heating between 800ºF (427ºC) and 1650ºF (899ºC). CarTech 347 stainless should be considered for use in aircraft collector rings and exhaust manifolds, expansion joints and high
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