ASTM B677
UNS N08904 (904L) seamless pipe and tube
Covers UNS N08904 (904L) and related high-alloy seamless pipe and tube.
- Pipe & tube
- ASME SB-677
- 1 grade in stock range
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What to know before ordering to ASTM B677
The points that decide whether material to ASTM B677 is accepted at inspection.
- 904L pipe may also be ordered to ASTM A312, which lists the grade.
- Material is supplied solution-annealed.
- Fittings are A403 WP904L and flanges A182 F904L.
Grades and products we supply to ASTM B677
| Grade | Product | Designation on the certificate |
|---|---|---|
| SS 904L | Pipe & Tube | ASTM B677 · A312 (N08904) |
| SS 904L | Pipe & Tube | ASTM B677 · B674 |
How ASTM B677 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.
Related standards
ASTM B677 — questions buyers ask
What does ASTM B677 cover?
Covers UNS N08904 (904L) and related high-alloy seamless pipe and tube.
Which grades do you supply to ASTM B677?
SS 904L — see the table on this page for the exact product and designation.
What is the difference between ASTM B677 and ASME SB-677?
ASME SB-677 is the ASME Boiler and Pressure Vessel Code (Section II) adoption of ASTM B677. 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.
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