A333 GR. 3/ GR. 6 Carbon Steel Pipes | IBR A333 Certified Carbon Steel Pipes

A333 GR. 3/ GR. 6 Seamless Carbon Steel Pipes & Tubes | A333 GR. 3/ GR. 6 Carbon Steel ERW Pipes & Tubes | A333 GR. 3/ GR. 6EFW Carbon Steel Pipes

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ASTM A333 CARBON STEEL SEAMLESS PIPES FOR LOW TEMPERATURE SERVICE

Carbon steel pipes manufacturer & supplierThis specification covers nominal (average) wall seamless and welded carbon and alloy steel pipe intended for use at low temperatures. Several grades of  steel are included as listed in Table 1. Some product sizes may not be available under this specification because heavier wall thicknesses have an adverse affect in low-temperature impact properties.
Supplementary Requirement S1 of an optional nature is provided. This shall apply only when specified by the purchaser.

The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification. The inch-pound units shall apply unless the “M” designation of this specification is specified in the order.

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.

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A333 GR. 3/ GR. 6 Carbon Steel Pipes Chemical Requirements

  Composition, %  
Element Grade 1 Grade 3 Grade 6
Carbon, max 0.30 0.19 0.30
Manganese 0.40 – 1.06 0.31 – 0.64 0.29 – 1.06
Phosphorous, max 0.025 0.025 0.025
Sulfur, max 0.025 0.025 0.025
Silicon 0.18 -0.37 0.10 min
Nickel 3.18 – 3.82

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.

A333 GR. 3/ GR. 6 Carbon Steel Pipes Tensile Requirements

The material shall conform to the requirements as proscribed:

Grade 1 Grade 3 Grade 6
psi MPa psi MPa psi MPa
Tensile Strength, min 55,000 380 65,000 450 60,000 415
Yield Strength, min 30,000 205 35,000 240 35,000 240
Longitudinal  Transverse Longitudinal  Transverse Longitudinal  Transverse
Elongation in 2 in. or 50 mm, (or 4D), min, %:
Basic minimum elongation for walls 5/16 in. [8 mm] and over in thickness, strip tests, and for all small sizes tested in full section 35 35 30 20 30 16.5
When the standard round 2-in. or 50-mm gage length or proportionally smaller size test specimen with the gage length equal to 4D (4 times the diameter) is used 28 20 22 14 22 12
For strip tests, a deduction for each 1/32in. [0.8 mm] decrease in wall thickness below 5/16 in. [8 mm] from the basic minimum elongation of the following percentage 1.75 1.25 1.50 1.00 1.50 1.00
  Elongation in 2 in. or 50 mm, min, %:
Wall Thickness Grade 1 Grade 3 Grade 6
in. mm Longitudinal  Transverse Longitudinal  Transverse Longitudinal  Transverse
5/16 (0.312) 8 35 25 30 20 30 16
9/32 (.281) 7.2 33 24 28 19 28 15
1/4 (.250) 6.4 32 23 27 18 27 15
7/32 (.219) 5.6 30 26 26
3/16 (.188) 4.8 28 24 24
5/32 (.156) 4 26 22 22
1/8 (.125) 3.2 25 21 21
3/32 (.094) 2.4 23 20 20
1/16 (.063) 1.6 21   18   18  

Impact Requirements
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:

Size of Specimen, min Minimum Average Notched Bar Impact Value of Each Set of Three Specimens Minimum Notched Bar Impact Value of One Specimen Only of a Set Impact Temperature
  ft-lbf J ft-lbf J Grade Min Impact 
Test Temp
10 by 10 13 18 10 14   F C
10 by 7.5 10 14 8 11 1 -50 -45
10 by 6.67 9 12 7 9 3 -150 -100
10 by 5 7 9 5 7 6 -50 -45
10 by 3.33 5 7 3 4  
10 by 2.5 4 5 3 4  

A333 GR. 3/ GR. 6 Carbon Steel Pipes 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 pipes to constitute 5% of the lot, but in no case less than 2 pipe.

A333 GR. 3/ GR. 6 Carbon Steel Pipes 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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