ASTM A334 Grade 9 Welded Carbon and Alloy-Steel Tubes/pipes
ASTM A334 Grade 9 specification covers several grades of minimum wall-thickness, seamless and welded, carbon and alloy-steel tubes intended for use at low temperatures. Some product sizes may not be available under this specification because heavier wall thicknesses have an adverse affect on low-temperature impact properties.
The size of ASTM A334 Grade 9 carbon and alloy welded pipe/tube
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
ASTM A334 Grade 9 material chemical composition
| Element | Carbon, max | Manganese | Phosphorus, max | Sulfur, max | Silicon | Nickel | Chromium | Copper | Aluminum |
| Grade 9 | 0.20 | 0.40–1.06 | 0.025 | 0.025 | 1.60–2.24 | 0.75–1.25 |
A334 Grade 9 Carbon and Alloy-Steel Tubes/pipes mechanical properties
| Grade 9 | ||
| ksi | MPa | |
| Tensile Strength, min | 63 | 435 |
| Yield Strength, min | 46 | 315 |
| 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 | 28 | |
| When standard round 2-in. or 50 mm gage length or proportionally smaller size specimen with the gage length equal to 4D(4 times the diameter) is used | -- | |
| For strip tests, a deduction for each 1 / 32 in. [0.8 mm] decrease in wall thickness below 5 / 16 in. [8 mm] from the basic minimum elongation of the following percentage Points | 1.50B | |
A Elongation of Grade 11 is for all walls and for small sizes tested in full section.
B The following table gives the calculated minimum values
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