General introduction of Ni-Span-C alloy 902 Elastic alloy wire
for wrist watch hairspring:
Heat treatable alloy designed primarily to obtain a constant
modulus of elasticity in a useful temperature range of -50 to 150°F
Addition of titanium to the nickel-chromium-iron alloy makes it
harden able by precipitation
Ni-Span-C alloy 902 elastic alloy wire has outstanding properties
of elastic modules control and high strength, combined with
unusually low drift and mechanical hysteresis
Standard product forms are round, strip, tube, pipe, and wire
Matching standard: AMS 5225, UNS N09902, Ni-Span-C alloy 902
Chemical composition of Ni-Span-C alloy 902:
Ni 42.5, Fe 49.0, Cr 5.3, Ti 2.4, Al 0.5
Applications of Elastic alloy wire for wrist watch hairspring:
Ni-Span-C alloy 902 is used for magnetostrictive sensor, level
sensor, flow sensor, precision springs, mechanical resonators, and
other precision elastic components