Super Alloy NI SPAN C™ (UNS N09902)

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations


Super alloys or high performance alloys contain many elements in a variety of combinations to achieve a desired result. These alloys are good for use at high temperatures and severe mechanical stress, and also in cases where high surface stability is needed. Super alloys provide good creep and oxidation resistance.

Strengthening of super alloys is performed by work hardening, solid-solution hardening, and precipitation hardening methods. NI SPAN C™ is a nickel-iron-chromium alloy that can be precipitation hardened by adding aluminium and titanium.

The following datasheet will provide more details about NI SPAN C™.

Chemical Composition

The following table shows the chemical composition of NI SPAN C™.

Element Content (%)
Iron, Fe 47
Nickel, Ni 41.0-43.5
Chromium, Cr 4.90-5.75
Titanium, Ti 2.20-2.75
Silicon, Si  1
Manganese, Mn  0.80
Aluminum, Al 0.30-0.80
Carbon, C  0.060
Phosphorous, P  0.040
Sulfur, S  0.040

Physical Properties

The physical properties of NI SPAN C™ are outlined in the following table.

Properties Metric Imperial
Density 8.05 g/cm³ 0.291 lb/in³
Melting point 1450-1480°C 2640-2700°F

Mechanical Properties

The mechanical properties of NI SPAN C™ are provided below.

Properties Metric Imperial
Tensile strength (precipitation hardened) 1210 MPa 175000 psi
Yield strength (@strain 0.200%, precipitation hardened) 760 MPa 110000 psi
Elastic modulus 165-200 GPa 23900-29000 ksi
Shear modulus 62-69 GPa 8990-10000 ksi
Elongation at break (precipitation hardened) 25% 25%

Thermal Properties

The thermal properties of NI SPAN C™ are given below.

Properties Metric Imperial
Thermal expansion co-efficient (@20-100°C/68-212°F) 7.60 µm/m°C 4.22 µin/in°F
Thermal conductivity 12.1 W/mK 84 BTU in/hr.ft².°F

Other Designations

Equivalent materials to NI SPAN C™ are:

  • AMS 5221
  • AMS 5223
  • AMS 5225

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