ASTM B625
Super-austenitic plate, sheet & strip (904L in earlier editions only)
Covers super-austenitic plate, sheet and strip such as UNS N08925, N08926, N08031 and R20033. Earlier editions also listed UNS N08904 (904L); current editions do not, and 904L flat products are ordered to ASTM A240 / ASME SA-240.
- Plate, sheet & strip
- ASME SB-625
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is ASTM B625?
ASTM B625 is the specification for super-austenitic Ni-Fe-Cr-Mo(-Cu) alloy plate, sheet and strip such as UNS N08925, N08926, N08031 and R20033. Earlier editions also listed UNS N08904 (904L); current editions do not, and 904L flat products are now ordered to ASTM A240. ASME adopts it as SB-625.
ASTM B625 at a glance
| Current alloys | N08925, N08926, N08031, N08932, N08354, R20033 and others (the list changes between editions) |
|---|---|
| Products | Plate, sheet and strip |
| 904L | Listed in earlier editions only; not in the current edition — today ordered to A240 / SA-240 |
| ASME designation | SB-625 |
904L: current vs legacy specifications
Legacy references still appear on older drawings and purchase orders.
How to write ASTM B625 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 B625 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) | B625-21 — 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 B625
The points that decide whether material to ASTM B625 is accepted at inspection.
- If an older specification or drawing names B625 for 904L, confirm the edition with your client before ordering.
- Specify which standard your design code or client specification calls for.
- 904L pipe is ASTM A312; 904L tube is A213 or A269.
How ASTM B625 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 B625
Same family
ASTM B625 — questions buyers ask
What is ASTM B625?
ASTM B625 is the specification for super-austenitic Ni-Fe-Cr-Mo(-Cu) alloy plate, sheet and strip such as UNS N08925, N08926, N08031 and R20033. Earlier editions also listed UNS N08904 (904L); current editions do not, and 904L flat products are now ordered to ASTM A240. ASME adopts it as SB-625.
Should 904L plate be ordered to B625?
Not to a current edition — it no longer lists N08904. Order to ASTM A240. If a client specification still names B625, confirm the edition with them.
Which alloys does B625 cover today?
Super-austenitic grades such as N08925, N08926 and N08031, and alloy 20 (R20033).
What is the difference between ASTM B625 and ASME SB-625?
ASME SB-625 is the ASME Boiler and Pressure Vessel Code (Section II) adoption of ASTM B625. 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 B625?
The publisher's listing checked on 7 October 2026 shows B625-21 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