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Model No: Ni-Span-C Alloy 902 Strip
AMS 5221 / UNS N09902 / Ni-Span-C Alloy 902
AMS 5221 / Ni-Span-C Alloy 902 is a precipitation hardenable Nickel-Iron-Chromium alloy having outstanding controllable thermoelastic coefficient characteristics and excellent oxidation resistance in high temperature atmospheres.
Delivery :
FOB
minimum order :
100 kilograms
Supply Ability :
5000Tonkilograms / Month
Stock Time :
7-10Day
Country of Origin :
CHINA
Quantity :
AMS 5221 / Ni-Span-C Alloy 902 is 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 +65°C (-50 to +150°F).
Ni-Span-C Alloy 902 offers the following key features
- Outstanding controllable thermoelastic coefficient characteristics.
- It can be processed to have a constant modulus of elasticity from -45ºC to +65ºC (-50ºF to +150ºF).
- Good for springs in watches and weighing equipment.
- Age hardenable.
Melting Process & Application
UNS N09902 is generally smelt in BEF / AOD, EAF + Electroslag remelting (ESR).
For superior quality, it should be smelt via vacuum refining technology or by agreement. It is suitable for applications such as high tensile shafts, bolts and nuts, gears, pinions spindles, and so on.
Chemical Composition
| Element | Min % | Max % |
|---|---|---|
| C | – | 0.06 |
| Mn | – | 0.80 |
| Si | – | 1.00 |
| P | – | 0.04 |
| S | – | 0.04 |
| Cr | 4.90 | 5.75 |
| Ni+Co | 41.00 | 43.50 |
| Ti | 2.20 | 2.75 |
| Al | 0.30 | 0.80 |
| Cr+(Ti-4xC) | 7.10 | 8.10 |
| Co | – | 1.00 |
| Fe | Bal | Bal |
Alloy Details
Ni-Span-C Alloy 902 density, melting point, coefficient of expansion, modulus of rigidity, and elasticity are indicated in the table below:
| Density | Melting Point | Coefficient of Expansion | Modulus of Rigidity | Modulus of Elasticity |
|---|---|---|---|---|
| 8.05 g/cm³ | 1480 °C | 7.6 μm/m °C (20 – 100 °C) | 62 – 69 kN/mm² | 165 – 200 kN/mm² |
| 0.291 lb/in³ | 2700 °F | 4.2 x 10-6 in/in °F (70 – 212 °F) | 8993 – 10008 ksi | 23932 – 29008 ksi |
Heat treatment of finished parts
The typical heat treatment of Ni-Span-C Alloy 902:
| Condition as supplied by AWI | Type | Temperature | Time | Cooling |
|---|---|---|---|---|
| Spring Temper – For good all round properties | Age Harden | 650 °C (1200 °F) | 2 Hr | Air |
| Spring Temper – For max stability | Stress Equalise Age Harden | 400 °C (750 °F) 650 °C (1200 °F) | 2 Hr 2 Hr | Air Air |
| Spring Temper – For minimum hysterisis & low thermoelastic coefficient | Stress Equalise | 400 °C (750 °F) | 2 Hr | Air |
Properties
The typical mechanical properties of Ni-Span-C Alloy 902
| Annealed | ||
|---|---|---|
| Approx. tensile strength | <800 N/mm² | <116 ksi |
| Approx. operating temperature (for constant modulus applications) | -45 to +65 °C | -50 to +150 °F |
| Spring Tempered | ||
|---|---|---|
| Approx. tensile strength | 900 – 1100 N/mm² | 131 – 159 ksi |
| Approx. operating temperature (for constant modulus applications) | -45 to +65 °C | -50 to +150 °F |
| Spring Temper + Aged | ||
|---|---|---|
| Approx. tensile strength | 1300 – 1500 N/mm² | 189 – 218 ksi |
| Approx. operating temperature (for constant modulus applications) | -45 to +65 °C | -50 to +150 °F |
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