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 supplied to it
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is ASTM A333?
ASTM A333 is the specification for seamless and welded steel pipe for low-temperature service, with Charpy impact testing at the grade's test temperature. Grade 6 (carbon steel) is tested at −45 °C (−50 °F); Grade 3 (3½% nickel) at −100 °C and Grade 8 (9% nickel) at −195 °C. ASME adopts it as SA-333.
ASTM A333 at a glance
| Products | Seamless and welded pipe |
|---|---|
| Common grades | Gr 6 (C-Mn), Gr 3 (3½Ni), Gr 8 (9Ni) |
| Grade 6 impact test | −45 °C (−50 °F) |
| Grade 6 strength | Pending current standard text |
| ASME designation | SA-333 |
How to write ASTM A333 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 A333 edition and verification status
Which edition we have confirmed, and what is still being checked before any numerical requirement is published here.
| Current edition | Not yet confirmed against the publisher listing |
|---|---|
| Full-text verification | In progress — numerical requirements are not published on this page |
| 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 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.
Standards used with ASTM A333
Same family
ASTM A333 — questions buyers ask
What is ASTM A333?
ASTM A333 is the specification for seamless and welded steel pipe for low-temperature service, with Charpy impact testing at the grade's test temperature. Grade 6 (carbon steel) is tested at −45 °C (−50 °F); Grade 3 (3½% nickel) at −100 °C and Grade 8 (9% nickel) at −195 °C. ASME adopts it as SA-333.
What is the impact test temperature for A333 Gr 6?
−45 °C (−50 °F).
Can A333 Gr 6 replace A106 Gr B?
Often yes — it meets similar strength and adds impact testing — but check the piping class.
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