A precipitation hardenable Nickel-Iron-Chromium alloy having outstanding controllable thermoelastic coefficient characteristics and excellent oxidation resistance in high temperature atmospheres. The alloy can be processed to have a constant modulus of elasticity at temperatures ranging from -45 to +65oC (-50 to +150oF).
| Chemical Composition | Specifications | Designations | Key Features | Typical Applications | |||||||||||||||||||||||||||||||||||||||
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AMS 5225 AMS 5221 HS 261 |
UNS N09902 AWS 080 |
Outstanding controllable thermoelastic coefficient characteristics Can be processed to have constant modulus of elasticity from from -45 to +65ºC (-50 to +150ºF) Good for springs in watches and weighing equipment Age hardenable |
Springs in precise applications, such as watches and weighing machines | |||||||||||||||||||||||||||||||||||||||
| Density | 8.05 g/cm³ | 0.291 lb/in³ |
| Melting Point | 1480°C | 2700°F |
| Coefficient of Expansion | 7.6 μm/m °C (20 – 100°C) | 4.2 x 10-6 in/in °F (70 – 212°F) |
| Modulus of Rigidity | 62 – 69 kN/mm² | 8993 – 10008 ksi |
| Modulus of Elasticity | 165 – 200 kN/mm² | 23932 – 29008 ksi |
| Heat Treatment of Finished Parts | |||||
|---|---|---|---|---|---|
| Condition as supplied by Alloy Wire | Type | Temperature | Time (Hr) | Cooling | |
| °C | °F | ||||
| Spring Temper – For good all round properties | Age Harden | 650 | 1200 | 2 | Air |
| Spring Temper – For max stability | Stress Equalise Age Harden |
400 650 |
750 1200 |
2 2 |
Air Air |
| Spring Temper – For minimum hysterisis & low thermoelastic coefficient | Stress Equalise | 400 | 750 | 2 | Air |
| Properties | ||||
|---|---|---|---|---|
| Condition | Approx. tensile strength | Approx. operating temperature | ||
| N/mm² | ksi | °C | °F | |
| Annealed | 600 – 800 | 87 – 116 | -45 to +65 | -50 to +150 |
| (for constant modulus applications) | ||||
| Spring Tempered | 900 – 1100 | 131 – 159 | -45 to +65 | -50 to +150 |
| (for constant modulus applications) | ||||
| Spring Temper + Aged | 1300 – 1500 | 189 – 218 | -45 to +65 | -50 to +150 |
| (for constant modulus applications) | ||||
The above tensile strength ranges are typical. If you require different please ask.
*Trade name of Special Metals Group
