ASTM A333 pipe

ASTM pipe covers seamless and welded carbon that is intended for cold temperature service tolerating temperatures as low as -150°F.

Required Information for Ordering

Characteristic What to Specify
Quantity Feet or number of lengths
Size NPS (Outside Diameter) and Schedule Number (Average Wall Thickness)
Construction Seamless or Welded
Grade Grade 1,3, or 6
Coating Bare, Black, FBE, etc
Manufacturer Approved Manufacturer List (AML), or Country of Origin restrictions


Grade C
(max %)
Mn P
(max %)
(max %)
Si Ni
Grade 1 0.3 0.40 – 1.06 0.025 0.025
Grade 3 0.19 0.31 – 0.64 0.025 0.025 0.18 – 0.37 3.18 – 3.82
Grade 6 0.3 0.29 – 1.06 0.025 0.025 0.10 min

For each reduction of 0.01% carbon below 0.30%, an increase of 0.05% manganese above 1.06% would be permitted to a maximum of 1.35% manganese.


  Grade 1 Grade 3 Grade 6
Tensile Strength
(min PSI)
55,000 65,000 60,000
Yield Strength
(min PSI)
30,000 35,000 35,000


is always provided in the normalized condition at a minimum and Charpy Impact tested to a specific temperature range to assure compliance with the required service temperature.

Minimum Impact Test Temperature

Grade F C
1 -50 -45
3 -150 -100
6 -50 -45


Transverse or Longitudinal Tension Test and Flattening Test, Hardness Test, or Bend Test For material heat treated in a batch-type furnace, tests shall be made on 5% of the pipe from each treated lot. For small lots, at least one pipe shall be tested. For material heat treated by the continuous process, tests shall be made on a sufficient number of pipe to constitute 5% of the lot, but in no case less than 2 pipe. Hydrostatic Test Impact Test One notched bar impact test, consisting of breaking three specimens shall be made from each heat represented in a heat-treatment load on specimens taken from the finished pipe.

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