ASTM B444
Ni-Cr-Mo-Nb alloy (625) seamless pipe and tube
Covers Alloy 625 (UNS N06625) and related Ni-Cr-Mo-Nb alloy seamless pipe and tube, in Grade 1 (annealed) and Grade 2 (solution-annealed).
- Pipe & tube
- ASME SB-444
- 1 grade supplied to it
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is ASTM B444?
ASTM B444 is the specification for Ni-Cr-Mo-Nb alloy pipe and tube — principally Alloy 625 (UNS N06625). Like ASTM B443 plate, it has Grade 1 (annealed) for strength and Grade 2 (solution annealed) for high-temperature creep service. Welded 625 pipe is ordered to ASTM B705. ASME adopts it as SB-444.
ASTM B444 at a glance
| Alloy | UNS N06625 (and N06852) |
|---|---|
| Products | Seamless pipe and tube |
| Conditions | Grade 1 annealed · Grade 2 solution annealed |
| ASME designation | SB-444 |
Alloy 625 specifications by product
| Product | Specification |
|---|---|
| Seamless pipe & tube | ASTM B444 |
| Welded pipe | ASTM B705 |
| Plate & sheet | ASTM B443 |
| Fittings | ASTM B366 WPNCMC |
| Flanges | ASTM B564 |
How to write ASTM B444 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 B444 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) | B444-23 — 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 B444
The points that decide whether material to ASTM B444 is accepted at inspection.
- Grade 1 suits corrosion service; Grade 2 is for high-temperature creep strength.
- Welded 625 pipe is ASTM B705.
- Fittings are B366 WPNCMC and flanges B564.
Grades and products we supply to ASTM B444
| Grade | Product | Designation on the certificate |
|---|---|---|
| Inconel 625 | Pipe & Tube | ASTM B444 |
| Inconel 625 | Pipe & Tube | ASTM B444 · B704 |
How ASTM B444 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 B444
Same family
ASTM B444 — questions buyers ask
What is ASTM B444?
ASTM B444 is the specification for Ni-Cr-Mo-Nb alloy pipe and tube — principally Alloy 625 (UNS N06625). Like ASTM B443 plate, it has Grade 1 (annealed) for strength and Grade 2 (solution annealed) for high-temperature creep service. Welded 625 pipe is ordered to ASTM B705. ASME adopts it as SB-444.
B444 Grade 1 or Grade 2?
Grade 1 (annealed) for strength at moderate temperatures; Grade 2 (solution annealed) for creep service at high temperature.
Which grades do you supply to ASTM B444?
Inconel 625 — see the table on this page for the exact product and designation.
What is the difference between ASTM B444 and ASME SB-444?
ASME SB-444 is the ASME Boiler and Pressure Vessel Code (Section II) adoption of ASTM B444. 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 B444?
The publisher's listing checked on 7 October 2026 shows B444-23 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