DESCRIPTION
NI-SPAN-C® Alloy 902 is a precipitation hardenable nickel-iron-chromium alloy with a thermoelastic coefficient that can be controlled by the amount of cold work and heat treatment temperature to fit a specific application’s needs. Alloy 902 also has low magnetostrictive properties appropriate for specific applications and has been successfully utilized at cryogenic temperatures.
Applicable Specifications
Wire & Bar:
AAMS 5221, AMS 5225, HS261
Applications
Precision instruments, Resonant vibrating systems, Tuning forks, Springs
Industries Supplied
Precision Equipment Manufacturing
Nominal Composition
C: 0.06 max
Mn: 0.80 max
Si: 1.00 max
P: 0.04max
S: 0.040 max
Ni+C0: 41.0 – 43.5
Cr: 4.90 – 5.75
Ti: 2.20 – 2.75
Cr+(Ti-4C): 7.10 – 8.10
Al: 0.30 – 0.80
Fe: 45 Bal
Physical Properties
Density:
0.291 lb/in3, (8.05 g/cm3)
Modulus of Elasticity (E):
At 70°F (20°C): 24-29 x 103 ksi (165-200 GPa)
Modulus of Rigidity (G):
At 70°F (20°C): 10.2 x 103 ksi (70.3 GPa)
Coefficient of Expansion:
4.2 µin/in-°F (70-212°F)
7.6 µm/m-°C (20-100°C)
Electrical Resistivity:
40 µohm-in, (101.6 µohm-cm)
Thermal Conductivity:
9.0 Btu-in/ft2-hr-°F, 12.1 W/m-K
Typical Mechanical Properties
Annealed
- Heat Treatment: Per Specifications
- Tensile Strength: 85-95 ksi (585-655 MPa)
- Suggested Operating Conditions: -50 to 150oF (-45 to 65 oC)
For constant modulus
Spring Temper
- Heat Treatment: None
- Tensile Strength: 140-160 ksi (965-1105 MPa)
- Suggested Operating Conditions: -50 to 150 oF (-45 to 65 oC)
For constant modulus
Spring Temper + Aged
- Heat Treatment: 1225-1300°F (663-704°C) 3-3.5 hrs
- Tensile Strength: 200-220 ksi (1380-1515 MPa)
- Suggested Operating Conditions: -50 to 150 oF (-45 to 65 oC)
For constant modulus
NI-SPAN-C® is a trademark of the Special Metals Corporation group of companies.
For further information Contact:
CONTACT US
Phone: 1.847.695.1900
Elgiloy Specialty Metals – Wire Products
356 N.Cross Street
Sycamore, IL 60178 USA
Limitation of Liability and Disclaimer of Warranty:
- The content in these data sheets is provided primarily by third-party melting mills and is provided for reference only. It is not intended for engineering or design.
- Applications may be discussed, however, Elgiloy Specialty Metals, a Division of Combined Metals Company LLC, does not recommend or endorse any material for any particular end use or application.
- The data included in this data sheet are typical values and may vary.
- Elgiloy Specialty Metals, a Division of Combined Metals Company LLC, makes no representations or warranties, express or implied, as to the accuracy, completeness, condition, suitability, performance, fitness for a particular purpose, or merchantability of any information contained in any data sheet.
In no event will Elgiloy Specialty Metals, a Division of Combined Metals Company LLC, be liable for any damages whatsoever arising from the use of the information included in the data sheets.
