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Introduction

NI-SPAN-C Alloy 902 is a heat treatable alloy designed  primarily to obtain a constant modulus of elasticity in a useful temperature  range of -50°F to 150°F . The addition of titanium to the  nickel-chromium-iron alloy makes it hardenable by precipitation. It has  outstanding properties of elastic modulus control and high strength, combined  with unusually low drift and mechanical hysteresis.

Density: 8.10g/cm3

Curie point: 120~190°C(solution treated)

Character

Outstanding controllable thermoelastic  coefficient characteristics

Can be processed to have constant  modulus of elasticity from -45 to +65ºC (-50 to +150ºF)

Good for springs in watches and  weighing equipment

Age-hardenable

Application

Diaphragms, leaf springs, helical  springs, precision springs, mechanical resonators, precision elastic  components.

Equal grades

Ni-Span C, Elinvar Extra, Sumispan-3,  EL-3

Chemical composition  (%)

Ni(+Co)=41.0-43.5

Cr=4.90-5.75

Ti=2.20-2.75

Al=0.30-0.80

C≤0.06

Mn≤0.80

Si≤1.00

S≤0.04

P≤0.04

Fe=reminder

Standards

SAE AMS 5221 - Strip, solution annealed

SAE AMS 5223 - Strip, 10% cold rolled

SAE AMS 5225 - Strip, 50% cold rolled

Forms available  at A-one Alloy

Cold drawn wire, cold drawn bar, cold  rolled strip, hot rolled plate, cold drawn pipe, hot rolled bar, hot forged  bar.

We could supply cold drawn wire and  cold rolled strip from EU & US. Stock items: cold drawn wire diameter  0.50mm & 0.75mm, bright finish, annealed.

Delivery

Stock items: cold drawn wire diameter 0.20,  0.35, 0.50mm, 0.75mm, 1.00mm in stock. Cold rolled strip thickness 0.1mm,  0.20mm and 0.30mm in stock.