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Nispan / Alloy C-902 UNS: N09902

A precipitation hardenable Nickel-Iron-Chromium alloy having an outstanding controllable thermoelastic coefficient characteristics and excellent strength and oxidation resistance in high temperature atmospheres. The alloy can be processed to have a constant modulus of elasticity at temperatures -45°C to +65°C. Applications include springs in precise applications, such as watches and weighing machines.
 
Approx Chemical Composition (%)
Ni
Cr
Ti
Fe

41.43.5
4.9-5.75
2.2-2.75
48

 

 

 
Density
(g/cm3)
8.05 Melting
Point (°C)
1480
Coefficient of Expansion

7.6 µ m/m °C At 21 - 93°C

Standards
AMS 5225
Heat Treatments For good all round properties Age : 650 oC – 2 Hrs – A/C
  For maximum stability Stress equalise : 400 oC – 2 Hrs – A/C
+
Age : 650 oC – 2 Hrs – A/C
  For minimum hysterisis & low thermo-elastic coefficient Stress equalise : 400 oC – 2 Hrs – A/C
  (Very high precision applications will require each batch to be pilot tested, to determine the specific heat treatment necessary to produce the required thermo-elastic coefficient).
Approx. Tensile Annealed 450 – 650 N/mm2
  Spring Temper 900 – 1100 N/mm2
  Spring Temper + Aged 1200 – 1500 N/mm2
Rigidity Modulus 62 - 69 kN/mm2
Youngs Modulus 165 - 200 kN/mm2  
Approx.
Service Temperatures
-45 °C to +65 °C for constant modulus applications
   
     
Click here for standard available sizes and forms...
 
 
     
If any of the specifications do not fall within your requirements please enquire:
Tel: +44 (0)1384 566775 or e-mail us at:
 


 

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Tel: +44(0) 1384 566775     Fax: +44(0) 1384 410074
email:

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