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A copper-nickel alloy with an alpha-phase structure. Small amounts of iron and manganese are added to improve corrosion resistance in high-velocity (from 1.5 to about 4.5 m/s) waters, including polluted seawater. The alloy is almost insensitive to stress corrosion. It retains its strength well at moderately elevated temperatures, has good cold- and hot-working properties and is readily weldable. The most commonly used wrought forms are plate, sheet, rod and tube. Typical uses include: chemical & marine: tubes and tubeplates for heavy-duty condensers, feedwater heaters and evaporators and fasteners. Mechanical: Fasteners.
| Weight % | Fe | Pb | Mn | Ni | Zn | Other | Cu |
|---|---|---|---|---|---|---|---|
| Minimum | 0.40 | — | — | 29.00 | — | — | Bal. |
| Maximum | 0.70 | 0.050 | 1.00 | 33.00 | 1.00 | 0.50 |
| Characteristics | English | Metric | ||
|---|---|---|---|---|
| Nominal density | 20°C / 68°F | 0.325 lbs/in3 | 8.95 g/cm3 | |
| Melting range | 2140-2260 °F | 1170-1240 °C | ||
| Specific heat capacity | 0.0908 BTU/lb- °F | 380 J/KG- °C | ||
| Thermal
conductivity |
Typical | 20°C / 68°F | 16.8 BTU/ft-hr-°F | 29 W/m-K |
| Mill
Annealed |
100°C / 212°F | 16.9 BTU/ft-hr-°F | 29.2 W/m-K | |
| 200°C / 392°F | 19.7 BTU/ft-hr-°F | 34.1 W/m-K | ||
| 300°C / 572°F | 22.3 BTU/ft-hr-°F | 38.6 W/m-K | ||
| 400°C / 752°F | 24.9 BTU/ft-hr-°F | 43.1 W/m-K | ||
| 500°C / 932°F | 27.8 BTU/ft-hr-°F | 48.1 W/m-K | ||
| 600°C / 1112°F | 30.7 BTU/ft-hr-°F | 53.1 W/m-K | ||
| 700°C / 1292°F | 33.6 BTU/ft-hr-°F | 58.1 W/m-K | ||
| Average coefficient of
thermal expansion From 20°C to temperature |
300°C / 572°F | 9.0 micro in/in- °F | 16.2 micro m/m- °K | |
| Electrical resistivity | 20°C / 68°F | 375 nΩ×m | ||
| Temper | Related size | Tensile | Hardness | ||||||
|---|---|---|---|---|---|---|---|---|---|
| (Thickness) | Ultimate | Yield | Elongation
At break |
Shear
Strength |
Brinell | ||||
| mm (in.) | KSI | MPa | KSI | MPa | % | KSI | MPa | ||
| Annealed | 1-20
(0.04-0.787) |
51.2 | 352.8 | 21.3 | 147 | 42 | 38.4 | 264.6 | 85 |
| Hot Rolled | 10-50
(0.393-1.96) |
54 | 372.4 | 22.7 | 156.8 | 38 | 39.8 | 274.4 | 90 |
| Typical cold-worked temper | 1-5
(0.04-0.196) |
71.1 | 490 | 61.1 | 421.4 | 16 | 49.7 | 343 | 140 |
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