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This specification2 covers nickel-iron-chromiummolybdenum-copper alloy (UNS N08825 and UNS N08221)* in the form of hot-finished and cold-drawn rounds, squares, hexagons, and rectangles. The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
| Element | UNS N08825 | UNS N08221 |
|---|---|---|
| Nickel | 38.0-46.0 | 39.0-46.0 |
| Chromium | 19.5-23.5 | 20.0-22.0 |
| lronA | 22.0 min | balance |
| Manganese | 1.0 max | 1.0 max |
| Carbon | 0.05 max | 0.025 max |
| Copper | 1.5-3.0 | 1.5-3.0 |
| Silicon | 0.5 max | 0.5 max |
| Sulfur | 0.03 max | 0.03 max |
| Aluminum | 0.2 max | 0.2 max |
| Titanium | 0.6-1.2 | 0.6-1.0 |
| Molybdenum | 2.5-3.5 | 5.0-6.5 |
Note :
A. Element shall be determined arithmetically by difference.
| Alloy | Condition | Tensile Strength min, ksi (MPa) | Yield Strength 0.2 % offset, min, ksi (MPa) | Elongation in 2 in. or 50 mm or 4D, min,% |
|---|---|---|---|---|
| UNS N08825 | Annealed: Hot-finished, cold–drawn | 85 (586) | 35 (241) | 30A |
| Forging Quality: | B | B | B | |
| UNS N08221 | All sizes annealed | 79 (544) | 34 (235) | 30 |
Note :
A. Not applicable to diameters or cross sections under 3⁄32 in. (2.4 mm).
B. Forging quality is furnished to chemical requirements and surface inspection only. No tensile properties are required.