ASTM B423
Ni-Fe-Cr-Mo-Cu alloy (825) seamless pipe and tube
Covers Alloy 825 (UNS N08825) and related Ni-Fe-Cr-Mo-Cu alloys as seamless pipe and tube, cold-worked or hot-finished and annealed.
- Pipe & tube
- ASME SB-423
- 1 grade supplied to it
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is ASTM B423?
ASTM B423 at a glance
| Alloys | N08825 (Alloy 825) and N08221 |
|---|---|
| Products | Seamless pipe and tube |
| Condition | Annealed |
| Annealed 825, min | Pending current standard text |
| ASME designation | SB-423 |
Alloy 825 — one alloy, six specifications
| Product | Specification |
|---|---|
| Seamless pipe & tube | ASTM B423 |
| Welded pipe | ASTM B705 |
| Plate, sheet, strip | ASTM B424 |
| Fittings | ASTM B366 WPNICMC |
| Flanges | ASTM B564 |
| Bar | ASTM B425 |
How to write ASTM B423 on a purchase order
Name the product, size, material specification and grade, the dimensional standard and the certificate. An example line:
Illustrative only — sizes, tests, inspection level and any project values come from your purchase specification.
ASTM B423 edition and verification status
Which edition we have confirmed, and what is still being checked before any numerical requirement is published here.
| Current edition (publisher listing) | B423-22 — checked 7 October 2026 |
|---|---|
| Full-text verification | In progress — numerical requirements are published here only after the current text has been reviewed |
| Edition on your order | The edition named in your purchase order or design code governs — confirm it with your enquiry |
What to know before ordering to ASTM B423
The points that decide whether material to ASTM B423 is accepted at inspection.
- Welded Alloy 825 pipe is ordered to ASTM B705 instead.
- Pipe dimensions usually follow ASME B36.19 schedules.
- Fittings in the same alloy are B366 WPNICMC; flanges are B564.
Grades and products we supply to ASTM B423
| Grade | Product | Designation on the certificate |
|---|---|---|
| Inconel 825 | Pipe & Tube | ASTM B423 |
| Inconel 825 | Pipe & Tube | ASTM B163 · B423 |
How ASTM B423 fits into an order
A purchase order line is only complete when it names the material standard, the dimensional standard and the inspection document. Miss one and the mill, the inspector and the buyer can each read the order differently.
Standards used with ASTM B423
Same family
ASTM B423 — questions buyers ask
What is ASTM B423?
ASTM B423 is the specification for seamless pipe and tube in Ni-Fe-Cr-Mo-Cu alloys — principally Alloy 825 (UNS N08825). Pipe is supplied cold-worked and annealed or hot-finished and annealed. Welded 825 pipe is ordered to ASTM B705, and plate to ASTM B424. ASME adopts it as SB-423.
Which standard covers Inconel 825 seamless pipe?
ASTM B423 (ASME SB-423), UNS N08825.
Is welded 825 pipe B423?
No — welded 825 pipe is ASTM B705.
Which grades do you supply to ASTM B423?
Inconel 825 — see the table on this page for the exact product and designation.
What is the difference between ASTM B423 and ASME SB-423?
ASME SB-423 is the ASME Boiler and Pressure Vessel Code (Section II) adoption of ASTM B423. The technical requirements are usually identical to a specific ASTM edition; pressure-equipment codes call for the ASME designation, and most mill certificates show both.
What is the current edition of ASTM B423?
The publisher's listing checked on 7 October 2026 shows B423-22 as the current edition. The edition that governs an order is the one named in the purchase order or design code. Full-text review of the current edition is in progress, so numerical requirements are not published on this page yet.
Do you supply certificates to this standard?
Yes. Material is supplied with mill test certificates to EN 10204 3.1 showing the standard, grade and heat number; 3.2 with third-party inspection on request.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026