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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 to about 3.5 m/s) waters, including seawater. The alloy is relatively insensitive to stress corrosion. It has good cold- and hot- working properties and is readily weldable. The most commonly used wrought forms are plate, sheet and tube. Typical applications include tubes & tubeplates for light-duty condensers, feedwater heaters and evaporators, power stations & multi-core cabled tubes for hydraulic and pneumatic lines.
| Weight % | Fe | Pb | Mn | Ni | Zn | Other | Cu |
|---|---|---|---|---|---|---|---|
| Minimum | 1.00 | — | — | 9.00 | — | — | Bal. |
| Maximum | 1.80 | 0.050 | 1.00 | 11.00 | 1.00 | 0.50 |
| Characteristics | English | Metric | ||
|---|---|---|---|---|
| Nominal density | 20°C / 68°F | 0.323 lbs/in3 | 8.94 g/cm3 | |
| Melting range | 2010-2100 °F | 1100-1150 °C | ||
| Specific heat capacity | 0.0908 BTU/lb- °F | 380 J/KG- °C | ||
| Thermal
conductivity |
Typical | 20°C / 68°F | 23.1 BTU/ft-hr-°F | 40 W/m-K |
| Mill Annealed | 100°C / 212°F | 34.4 BTU/ft-hr-°F | 59.5 W/m-K | |
| 200°C / 392°F | 40.6 BTU/ft-hr-°F | 70.2 W/m-K | ||
| 300°C / 572°F | 45.4 BTU/ft-hr-°F | 78.5 W/m-K | ||
| 400°C / 752°F | 47.9 BTU/ft-hr-°F | 82.8 W/m-K | ||
| 500°C / 932°F | 48.6 BTU/ft-hr-°F | 84.0 W/m-K | ||
| 600°C / 1112°F | 49.9 BTU/ft-hr-°F | 86.3 W/m-K | ||
| 700°C / 1292°F | 50.1 BTU/ft-hr-°F | 86.6 W/m-K | ||
| Average coefficient of
thermal expansion From 20°C to temperature |
300°C / 572°F | 9.5 micro in/in- °F | 17.1 micro m/m- °K | |
| Electrical resistivity | 20°C / 68°F | 53.9 nΩ×m | ||
| Temper | Tensile | Hardness | ||||
|---|---|---|---|---|---|---|
| 1 mm (0.04 in thick) | Ultimate | Yield | Elongation
At break |
Rockwell B | ||
| KSI | MPa | KSI | MPa | % | ||
| OS050 –
Avg’ Grain Size 0.05mm |
51 | 350 | 13 | 90 | 35 | 25 |
| OS035 –
Avg’ Grain Size 0.035mm |
52 | 358 | 14 | 98 | 35 | 27 |
| OS025 –
Avg’ Grain Size 0.025mm |
53 | 365 | 16 | 110 | 35 | 30 |
| H01 – ¼ Hard | 60 | 415 | 49 | 338 | 20 | 58 |
| H02 – ½ Hard | 68 | 468 | 63 | 435 | 8 | 75 |
| H04 – Hard | 75 | 518 | 72 | 500 | 5 | 80 |
| H06 – Extra Hard | 78 | 540 | 76 | 525 | 4 | 82 |
| H08 – Spring | 82 | 565 | 79 | 545 | 3 | 84 |
| H10 – Extra Spring | 85 | 585 | 79 | 545 | 3 | 86 |
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