ASTM A335 P5, P9, P11 and P12 seamless pipe
Our A335 alloy-pipe catalog covers P5, P9, P11 and P12, with outside diameters of 21.3–610 mm and Sch 20–XXS walls. Full lengths and cut pieces serve plant fabrication and planned replacements; each grade keeps its own delivery condition and material requirements.
Plant orders retain the specified P-grade and heat-treated delivery condition. New construction and replacement pieces are reviewed against the same material requirements.
Full pipe lengths and cut pieces retain the specified P-grade. The project design and fabrication requirements set the matching fittings, weld procedure and inspection scope.
A replacement section must match the original material specification, not merely its measured diameter. The old drawing and material record are more useful for grade selection than the appearance of the removed pipe.
| Item | Supply Range |
|---|---|
| Product | Seamless ferritic alloy steel pipe for specified high-temperature service |
| Manufacturing type | Seamless; delivered condition follows the selected grade and order |
| Standards & grades | ASTM A335 P5, P9, P11 and P12 |
| Outside diameter | 21.3–610 mm catalog range |
| Wall designation | Sch 20–XXS catalog range; selected Sch 40, 80 and 160 dimensions compared below |
| Length formats | 5.8–12 m, SRL, DRL or custom lengths |
| Base surface | Mill finish with the ordered cleaning and preservation |
| Protection options | Temporary protection compatible with later fabrication |
| Connection options | Plain, beveled or threaded ends; identify any additional end work on the drawing |
| Additional processing | Cutting, facing and identified cut pieces |
| Inspection & records | Grade chemistry, delivery condition and applicable mechanical, hardness and pipe-test records |
| Packing & delivery | Grade-separated packing and retained heat identification |
Material grade, delivery condition and required testing stay with the selected pipe item through preparation and shipment.
Compare nominal walls at the same NPS. The selected dimensions below are a standard reference, not a stock list.
Swipe left to see all columns.
| NPS | OD (mm) | Sch 40 wall (mm) | Sch 80 wall (mm) | Sch 160 wall (mm) |
|---|---|---|---|---|
| 1/2 | 21.3 | 2.77 | 3.73 | 4.78 |
| 1 | 33.4 | 3.38 | 4.55 | 6.35 |
| 1 1/2 | 48.3 | 3.68 | 5.08 | 7.14 |
| 2 | 60.3 | 3.91 | 5.54 | 8.74 |
| 2 1/2 | 73.0 | 5.16 | 7.01 | 9.53 |
| 3 | 88.9 | 5.49 | 7.62 | 11.13 |
Nominal size and wall do not establish a working pressure or temperature. The design basis and ordered material specification govern service selection.
We cut alloy pipe to the requested lengths and retain part and heat references through end preparation and packing.
Plain ends, bevels and machining blanks follow the drawing. Blanks retain the facing or machining allowance requested for the finished connection.
The pipe is quoted with the delivery condition required for its grade. Subsequent fabrication and post-weld heat treatment belong to the later fabrication scope.
Release checks bring the material certificate, finished-piece dimensions and required pipe-test results into one shipment record.
The seamless route produces the hollow section without a longitudinal production weld. Grade-controlled handling keeps chrome-moly pipe distinct from ordinary carbon pipe through finishing and cutting.
Chemistry, mechanical properties and applicable hardness results are reviewed with the delivered condition. Pipe-body tests and dimensions remain separate acceptance items.
The material certificate identifies the P-grade and the delivered material lot.
The record reference connects the treatment lot with the heat number on the material certificate.
Wall, length and prepared ends are checked after the specified processing.
Cut-piece and package references link the delivered quantity to its material documentation.
Package identification keeps the A335 P-grade and heat references visible through storage and dispatch. Similar-looking pipe is separated by its material identity.
Ends are protected against knocks and contamination. Supports separate the pipe from loading surfaces without covering the identification needed at receipt.
Short blanks and finished-length pieces retain their part references. The packing list allows the fabrication shop to match pieces with the relevant material records.
Grade, delivery condition, quantity and additional inspection can change the production route and timing. Our offer separates those requirements from freight and identifies the exact supply selection before order release.
The table is a nominal dimensional reference. Our catalog covers P5, P9, P11 and P12 within the listed OD and wall ranges; the quotation confirms each complete grade, size, wall, condition and quantity combination.
Use the grade specified by the project. Different P-grades have different material and fabrication requirements; a replacement needs engineering approval for the service, joining and heat treatment involved.
Yes. Part and heat references stay connected through cutting, end work and packing. The delivered piece count can then be matched to the relevant material records.
A335 P-grades describe pipe; A213 T-grades cover boiler, superheater and heat-exchanger tubing. Even when alloy families are related, dimensions, wall basis and the product specification must match the ordered item.
A sample can help establish geometry, but its appearance does not identify alloy grade or original delivery condition. Add the old drawing, marking or material certificate when available so the replacement can be matched correctly.
It records the delivery condition of the supplied pipe. Post-weld heat treatment is a later fabrication stage; it needs the records for the actual welded assembly.
Send the grade and pipe list with quantity and destination. For a replacement, attach the original drawing or material record so we can match the specified material and delivery condition.