ASTM A333 Grade 7 Welded Steel Pipe/tube
A333 Standard Specification for Seamless and Welded Steel Pipe for Low-Temperature Service.
ASTM A333 Grade 7 specification covers nominal (average) wall seamless and welded carbon and alloy steel pipe intended for use at low temperature. 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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ASTM A333 grade 7 material chemical composition
| Element | Carbon, max | Manganese | Phosphorus, max | Sulfur, max | Silicon | Nickel | Chromium | Copper | Aluminum |
| Grade 7 | 0.19 | 0.90max | 0.025 | 0.025 | 0.13-0.32 | 2.03-2.57 | - | - | - |
ASTM A333 Grade 7 Welded Steel Pipe/tube mechanical properties
| Grade 7 | ||
| Psi | MPa | |
| Tensile strength, min | 65 000 | 450 |
| Yield strength, min | 35 000 | 240 |
| Longitudinal | Transverse | |
| Elongation in 2 in. or 50 mm, (or 4D), min, %: | ||
| Basic minimum elongation for walls5 ⁄16 in. [8 mm] and over in thickness, strip tests, and for all small sizes tested in full section | 30 | 22 |
| When 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 | 22 | 14 |
| For strip tests, a deduction for each1 ⁄32 in. [0.8 mm] decrease in wall thickness below5 ⁄16 in. [8 mm] from the basic minimum elongation of the following percentage | 1.50 | 1.00 |
A333 Grade 7 welded steel pipe/tube dimension
ERW; outer diameter:21.3-660mm thickness:6-25mm
LSAW; outer diameter:325-1524mm thickness:6-50mm
SSAW: outer diameter:219-3200mm thickness:5-25mm
