Construcción naval
Especificación estándar ASTM A333 para tubería sin costura y tubería soldada para servicio a baja temperatura y otras aplicaciones con dureza de muesca requerida.
Material: Gr.6
Esta especificación cubre las tuberías de acero al carbono y de aleación soldadas y sin soldadura de pared destinadas a su uso a bajas temperaturas. La tubería se fabricará mediante el proceso de soldadura o sin costura sin adición de metal de aporte en la operación de soldadura.
Requisitos químicos de 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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Requisitos de tracción de ASTM A333
El material se ajustará a los requisitos que se prescriben:
| 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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