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Ni-Span-C Alloy 902*

Available in any of the 'profile options'

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
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
AMS 5225
AMS 5221
HS 261
W.Nr 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

Static applications

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