ASTM A213 TP347 Cold Finished Seamless Pipe 168.3 x 4.2 x 8000 mm
This is a cold finished TP347 seamless pipe supplied to ASME B36.19 dimensions and ASTM A213 material requirements, in a fixed size of 168.3 mm outside diameter, 4.2 mm wall and 8000 mm length. TP347 is a niobium…
What This Product Is For
This is a cold finished TP347 seamless pipe supplied to ASME B36.19 dimensions and ASTM A213 material requirements, in a fixed size of 168.3 mm outside diameter, 4.2 mm wall and 8000 mm length. TP347 is a niobium stabilised austenitic grade, which keeps chromium carbide out of the grain boundaries after welding and after service between 425 and 815 C. Buyers use it where a 304 or 316 line would sensitise and fail at the weld.
Key Benefits
- Niobium stabilised chemistry resists intergranular attack in the heat affected zone after welding
- Cold finished surface gives a tighter bore and a cleaner inside wall than a hot finished pipe of the same schedule
- Fixed 8000 mm mill length reduces the number of field joints on a long run
- Six finish options from pickled through mirror let one grade cover both structural and sanitary duty
- Shipped in 7 to 20 days so a stalled maintenance window can still be closed
Who It Is For
- EPC contractors buying line pipe against an ASME B36.19 schedule
- Refinery and chemical plant maintenance teams replacing a sensitised 304 line
- Pressure vessel and boiler fabricators who weld and cannot re-anneal
- Pipe stockists carrying stabilised grades in DN150
Problems It Solves
- Weld decay in unstabilised austenitic pipe after welding or after high temperature service
- Short random lengths that force extra site welds and extra NDT
- Mixed finish requirements that would otherwise mean two separate purchase orders
- Long mill lead times when a shutdown date is already fixed
Application Scenarios
- High temperature steam and flue gas lines that cycle through the carbide precipitation range
- Refinery and petrochemical piping welded on site without post weld solution annealing
- Construction and structural runs in DN150 where a stabilised grade is specified
- Oil and gas gathering lines that see chloride bearing condensate
Specifications
Every value below is taken from the published product data. Where a figure is not published it is left out rather than estimated.
| Standard | ASME B36.19 dimensions, ASTM A213 material |
|---|---|
| Grade | TP347 |
| Outside Diameter | 168.3 mm, 6 inch, DN150 |
| Wall Thickness | 4.2 mm |
| Length | 8000 mm |
| Section Shape | Round |
| Type | TP347 seamless pipe |
| Surface Treatment | Pickled, 2B, No.4, BA, hairline, mirror |
| Chromium | 17.0 to 20.0 percent |
| Nickel | 9.0 to 13.0 percent |
| Carbon | 0.08 percent maximum |
| Manganese | 2.0 percent maximum |
| Silicon | 0.75 percent maximum |
| Phosphorus | 0.04 percent maximum |
| Sulphur | 0.30 percent maximum |
| Application | Construction, oil, gas |
| Place of Origin | Xi'an, Shaanxi, China |
| Packing | Standard export packing or to buyer specification |
| Delivery | 7 to 20 days |
Technical Features
- Seamless construction with no longitudinal weld seam
- Dimensions to ASME B36.19, material to ASTM A213 TP347
- Chromium 17.0 to 20.0 percent and nickel 9.0 to 13.0 percent
- Carbon 0.08 percent maximum with niobium and tantalum at ten times carbon minimum
- Surface treatment selectable as pickled, 2B, No.4, BA, hairline or mirror
Materials
- TP347 austenitic stainless steel
Manufacturing Process
- Seamless piercing and elongating
- Cold finishing
- Heat treatment
- Pickling and surface finishing
Quality Control
- Chemical composition verified against the ASTM A213 TP347 ranges before release
- Outside diameter, wall thickness and length checked against the ordered 168.3 x 4.2 x 8000 mm
- Surface inspected after pickling or polishing for the ordered finish
- Mill test certificate issued with each heat
Customisation Options
- Surface finish selected from pickled, 2B, No.4, BA, hairline or mirror
- Cut length to buyer drawing instead of the standard 8000 mm
- Export packing to buyer packing specification
Use Guide
- Confirm the schedule against ASME B36.19 before ordering, as 4.2 mm wall on 168.3 mm OD is a fixed combination here
- Use a matching 347 or 347H filler metal so the stabilisation carries through the weld
- Pickle and passivate any field weld that will see chloride service
- Store on timber dunnage, not directly on carbon steel racks, to avoid iron contamination of the surface
How It Compares With the Alternatives
| TP304 seamless pipe | TP347 carries niobium stabilisation, so it keeps corrosion resistance at the weld where plain 304 sensitises |
|---|---|
| TP321 seamless pipe | Both are stabilised, but TP347 uses niobium instead of titanium, which survives cross country welding and repeated heat cycles with less stabiliser loss |
| Welded TP347 pipe | A seamless body has no longitudinal weld to inspect or to fail, which matters on cyclic high temperature service |
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View specifications →ASTM A213 TP347 Cold Finished Seamless Pipe 168. Questions
What is the lead time for this size
Can you supply lengths other than 8000 mm
Which surface finishes are available
Do you issue a mill test certificate
Why choose TP347 over TP304
How is the pipe packed for export
Quote ASTM A213 TP347 Cold Finished Seamless Pipe 16
Send the size, wall or thickness, quantity and destination port. Certificates, packing and lead time are confirmed on the quotation.