ASTM A333
Seamless and welded steel pipe for low-temperature service
Covers seamless and welded carbon and alloy steel pipe for low-temperature service, with mandatory Charpy impact testing. Grade 6 is the common carbon steel grade, tested at −45 °C.
- Pipe & tube
- ASME SA-333
- 1 grade in stock range
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What to know before ordering to ASTM A333
The points that decide whether material to ASTM A333 is accepted at inspection.
- The impact test temperature is part of the grade; check it against your minimum design temperature.
- Matching fittings are ASTM A420 WPL6 and matching flanges ASTM A350 LF2.
- Sizes follow ASME B36.10.
Grades and products we supply to ASTM A333
| Grade | Product | Designation on the certificate |
|---|---|---|
| ASTM A333 Gr 6 | Pipe & Tube | ASTM A333 Gr 6 |
How ASTM A333 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 A333 — questions buyers ask
What does ASTM A333 cover?
Covers seamless and welded carbon and alloy steel pipe for low-temperature service, with mandatory Charpy impact testing. Grade 6 is the common carbon steel grade, tested at −45 °C.
Which grades do you supply to ASTM A333?
ASTM A333 Gr 6 — see the table on this page for the exact product and designation.
What is the difference between ASTM A333 and ASME SA-333?
ASME SA-333 is the ASME Boiler and Pressure Vessel Code (Section II) adoption of ASTM A333. 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