List of Alloys & profiles

List of Alloys & profiles

Alloy Wire International

Datasheet: Ni-Span-C Alloy 902®

Ni-Span-C Alloy 902®

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).

Available in all profile options

alloy featured image inconel Ni-Span-C Alloy 902®

Key Features

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.

Typical Applications

Springs in precise applications, such as watches and weighing machines


Designations

UNS N09902
AWS 080

Specifications

AMS 5225
AMS 5221
HS 261

Chemical Composition

ElementMin %Max %
C0.06
Mn0.80
Si1.00
P0.04
S0.04
Cr4.905.75
Ni+Co41.0043.50
Ti2.202.75
Al0.300.80
Cr+(Ti-4xC)7.108.10
Co1.00
FeBal Bal

Alloy Details

DensityMelting PointCoefficient of ExpansionModulus of RigidityModulus of Elasticity
8.05 g/cm³1480 °C7.6 μm/m °C (20 – 100 °C)62 – 69 kN/mm²165 – 200 kN/mm²
0.291 lb/in³2700 °F4.2 x 10-6 in/in °F (70 – 212 °F)8993 – 10008 ksi23932 – 29008 ksi

Heat treatment of finished parts

Condition as supplied by AWITypeTemperatureTimeCooling
Spring Temper – For good all round propertiesAge Harden650 °C (1200 °F)2 HrAir
Spring Temper – For max stabilityStress Equalise
Age Harden
400 °C (750 °F)
650 °C (1200 °F)
2 Hr
2 Hr
Air
Air
Spring Temper – For minimum hysterisis & low thermoelastic coefficientStress Equalise400 °C (750 °F)2 HrAir

Properties

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 strength900 – 1100 N/mm²131 – 159 ksi
Approx. operating temperature (for constant modulus applications)-45 to +65 °C-50 to +150 °F
Spring Temper + Aged
Approx. tensile strength1300 – 1500 N/mm²189 – 218 ksi
Approx. operating temperature (for constant modulus applications)-45 to +65 °C-50 to +150 °F

The above tensile strength ranges are typical. If you require different please ask.

*Trade name of Special Metals Group