This specification covers nickel-copper-aluminum alloy (UNS N05500) in the form of rounds, squares, hexagons, or rectangles, and forgings and forging stock, manufactured either by hot working or cold working, and cold-worked wire. 1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
| Element | Composition Limits, % | Product (check) analysis variations, under min or over max, of the specified limit of element, % |
|---|---|---|
| NickelA | 63.0 min | 0.45 |
| Aluminum | 2.30–3.15 | 0.20 |
| Carbon | 0.18 max | 0.01 |
| Iron | 2.0 max | 0.05 |
| Manganese | 1.5 max | 0.04 |
| Silicon | 0.50 max | 0.03 |
| Titanium | 0.35–0.85 | 0.03 min 0.04 max |
| Sulfur | 0.010 max | 0.003 |
| Copper | 27.0–33.0 | 0.15 min 0.20 max |
A. The nickel content shall be determined arithmetically by difference.
| Form | Condition | Hardness | |
|---|---|---|---|
| Brinell 3000 kg, max | Rockwell, max | ||
| Rounds,B hexagons, squares, rectangles, and forgings | Hot-worked | 245 | C23 |
| Hexagons | Cold-worked | 260 | C26 |
| Rounds: | |||
| ⁄4 (6.4 mm) to 1 in. (25.4 mm), incl | Cold-worked | 280 | C29 |
| Over 1 (25.4 mm) to 3 in. (76.2 mm), incl | Cold-worked | 260 | C26 |
| Over 3 (76.2 mm) to 4 in. (101.6 mm), incl | Cold-worked | 240 | C22 |
| Rounds, hexagons, squares, rectangles, and forgings | Hot-worked or coldworked and annealed | 185 | B90 |
A. No tensile tests are required except as provided for in 9.2.3.
B. Rounds over 41⁄4 in. (108.0 mm) in diameter shall have hardness of 260 BHN,
max.
| Form | Condition | Maximum Section Thickness, in. (mm) | Tensile Strength, min, ksi (MPa) | Yield StrengthB, 0.2 % offset, min, ksi (MPa) | ElongationB in 2 in. or 4D, min,% | HardnessC | |
|---|---|---|---|---|---|---|---|
| Brinell 3000 kg, min | Rockwell C, min | ||||||
| Rounds,D hexagons, squares, rectangles, and forgingsE | Hot-worked and agehardened | All sizes | 140 (965) | 100 (690) | 20.0 | 265 | 27 |
| Rounds | Cold-worked and age-hardened | 1⁄4 (6.4) to 1 (25.4), incl | 145 (1000) | 110 (760) | 15.0 | 300 | 32 |
| over 1 (25.4) to 3 (76.2), incl | 140 (965) | 100 (690) | 17.0 | 280 | 29 | ||
| over 3 (76.2) to 4 (101.6), incl | 135 (930) | 95 (655) | 20.0 | 255 | 25 | ||
| Hexagons | Cold-worked and agehardened | 1⁄4 (6.4) to 2 (50.8), incl | 140 (965) | 100 (690) | 15.0 | 265 | 27 |
| Rounds, hexagons, squares, rectangles, and forgings | Annealed and age-hardenedF | Up to 1 (25.4) | 130 (895) | 90 (620) | 20.0 | 250 | 24 |
| 1 (25.4) and over | 130 (895) | 85 (585) | 20.0 | 250 | 24 | ||
A. Age hardening heat treatment:
Age hardening shall be accomplished by holding at an aim temperature of 1100°F (595°C) for 8 to 16 h followed by furnace cooling to 900°F (480°C) at a rate of 15
to 25°F (10 to 15°C) per hour and then air cooling. An alternate procedure consists of holding at 1100°F (595°C) for up to 16 h, furnace cooling to 1000°F (540°C), holding
for approximately 6 h, furnace cooling to 900°F (480°C), holding for approximately 8 h, and air cooling to room temperature.
(Mill age-hardened products have been precipitation heat treated by the manufacturer and further thermal treatment normally is not required. Hot-worked, cold-worked,
or annealed material is normally age hardened by the purchaser after forming or machining.)
B. Not applicable to subsize tensile specimens less than 0.250 in. (6.4 mm) in diameter.
C. Hardness values are given for information only and are not the basis for acceptance or rejection.
D. Rounds over 41⁄4 in. (108.0 mm) in diameter shall have an elongation in 2 in. (50.8 mm) or 4D of 17 %, min.
E. When specified, for forged rings and discs, hardness measurements may be utilized in lieu of tensile test.
F. Applicable to both hot-worked and cold-worked material.