ASTM A333 carbon and alloy steel pipe
ASTM A333 (ASME S/A-333) pipe grades permit low temperature service. This specification covers nominal walled pipe almost exclusively in seamless. Several grades of ferritic steel are included. Some product sizes may not be available under this specification because heavier wall thicknesses have an adverse effect on low-temperature impact properties. A333 pipe is furnished to nine different grades designated by numbers 1, 3, 4, 6, 7, 8, 9, 10, & 11. Discussed herein are Grades 1, 3 and 6.
| 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 | |
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.
| ASTM A333 | 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 | |||
| 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 | |||
If you are interested in other boiler steel tube, please click SA210, SA213, SA106, SA333, SA335, SA192, A53, A252, A106, EN10216, DIN17175, JIS G 3461, GB3087, GB5310.
