ASTM A334 / A334M
This specification2 covers several grades of minimumwall- 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.Supplementary Requirement S1 of an optional nature is provided. This shall apply only when specified by the purchaser. NOTE 1—For tubing smaller than 1⁄2 in. [12.7 mm] in outside diameter, the elongation values given for strip specimens in Table 1 shall apply. Mechanical property requirements do not apply to tubing smaller than 1⁄8 in. [3.2 mm] in outside diameter and with a wall thickness under 0.015 in. [0.4 mm].
Chemical Properties
Chemical Properties
| Grade |
Carbon, max |
Manganese, max |
Phosphorus, max |
Sulfur, max |
Silicon, max |
Nickel |
Chromium |
Copper |
Cobalt |
Molybdenum |
| Grade 1A |
0.30 |
0.40–1.06 |
0.025 |
0.025 |
... |
... |
... |
... |
... |
... |
| Grade 3 |
0.19 |
0.31–0.64 |
0.025 |
0.025 |
0.18–0.37 |
3.18–3.82 |
... |
... |
... |
... |
| Grade 6A |
0.30 |
0.29–1.06 |
0.025 |
0.025 |
0.10 min |
... |
... |
... |
... |
... |
| Grade 7 |
0.19 |
0.90 max |
0.025 |
0.025 |
0.13–0.32 |
2.03–2.57 |
... |
... |
... |
... |
| Grade 8 |
0.13 |
0.90 max |
0.025 |
0.025 |
0.13–0.32 |
8.40–9.60 |
... |
... |
... |
... |
| Grade 9 |
0.20 |
0.40–1.06 |
0.025 |
0.025 |
... |
1.60–2.24 |
... |
0.75–1.25 |
... |
... |
| Grade 11 |
0.10 |
0.60 max |
0.025 |
0.025 |
0.35 max |
35.0–37.0 |
0.50 max |
... |
0.50 max |
0.50 max |
Note: A AFor each reduction of 0.01 % carbon below 0.30 %, an increase of 0.05 % manganese above 1.06 % will be permitted to a maximum of 1.35 % manganese.
Mechanical Properties
Note A:Elongation of Grade 11 is for all walls and for small sizes tested in full section.
Products
