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ASTM A333 standard specification for seamless and welded steel pipe for low-temperature service and other applications with required notch toughness.
This specification covers wall seamless and welded carbon and alloy steel pipe intended for use at low temperatures. The pipe shall be made by the seamless or welding process with the addition of no filler metal in the welding operation.
Chemical Requirements of ASTM A333
| 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 |
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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 | ||
| 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 | |
| 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 |
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