ASME SA333/SA333M GR6 Seamless Steel Pipe ASTM A333 Gr6 Low Temperature Steel Pipes
A333 PIPE SPECIFICATIONS
NPS 1/4″ – 42″
Schedules 10 through 160, STD, XH and XXH
Scope
ASTM A333 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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Material & Manufacture
The pipe shall be made by the seamless or welding process with the addition of no filler metal in the welding operation.
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 4.3.1.1; section 4.3.1.2 or section 4.3.1.3 Quenched and Tempered per A 333/A 333M – 05 section 4.3.2.1 Double Normalized and Tempered per A 333/A 333M – 05 section 4.3.2.2
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.
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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 | 25 | 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 | | | | |
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.
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ASME SA333/SA333M GR6 Seamless Steel Pipe ASTM A333 Gr6 Low Temperature Images
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