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A333 Pipe

Omega Steel Company carries a wide range of low temp charpy tested API material, which we offer as an alternate to A333 products. This specification covers nominal (average) wall seamless and welded carbon and alloy steel pipe intended for use at low temperatures. Several grades of ferritic steel are included. Some product sizes may not be available under this specification because heavier wall thicknesses have an adverse affect on low-temperature impact properties.


Contact us for your next A333 pipe project:

Email Skip Palazzolo   |   314.595.5020

Product Spec Guide:

        Composition %    
  C(max) Mn P(max) S(max) Si Ni
Grade 1 0.03 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. When Grade 6 is ordered under this specification, supplying an alloy grade that specifically requires the addition of any element other than those listed for the ordered grade is not permitted. However, the addition of elements required for the deoxidation of the steel is permitted.

Impact Testing

Minimum Size of Specimen   Minimum Average Impact Value of Each Set of Three Specimens   Minimum Impact Value of One Specimen   Impact Temperature
  Foot Pounds Joules Foot Pounds Joules F C
10 x 10 13 18 10 14 -50 -45
10 x 7.5 10 14 8 11 -150 -100
10 x 6.67 9 12 7 9 -50 -45
10 x 5 7 9 5 7
10 x 3.33 5 7 3 4
10 x 2.5 4 5 3 4

For Grades 1, 3 and 6, the notched-bar impact properties of each set of three impact specimens, including specimens for the welded joint in welded pipe with wall thicknesses of 0.120 in. [3 mm] and larger, shall not be less than the values prescribed:

Heat Treatment Requirements:

All seamless and welded pipe shall be treated to control their microstructure by the following methods: Normalizing per A 333/A 333M-05 section; section or section Quenched and Tempered per A 333/A 333M - 05 section Double Normalized and Tempered per A 333/A 333M - 05 section

Mechanical Testing

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. Contact us for your next A333 pipe project.


Minimum Yield/Tensile

Grade 1  
Minimum Yield 30,000 PSI
Minimum Tensile 55,000 PSI
Grade 3
Minimum Yield 35,000 PSI
Minimum Tensile 65,000 PSI
Grade 6
Minimum Yield 35,000 PSI
Minimum Tensile 60,000 PSI