Limiting Chemical Composition, %

Ni - 38.0-46.0
Fe - 22.0 min.
Cr - 19.5-23.5
Mo - 2.5-3.5
Cu - 1.5-3.0
Ti - 0.6-1.2
C - 0.05 max.
Mn - 1.0 max.
S - 0.03 max.
Si - 0.5 max.
Al - 0.20 max.

Typical Mechanical Properties (Annealed)

Physical Constants and Thermal Properties

Density, Ib/in3 •••••• 0.294
g/cm3 •••••• 8.14
Melting Range, °F •••••• 2500 – 2550
°C •••••• 1370 – 1400
Specific Heat, Btu/lb •°F •••••• 0.105
J/kg • °C •••••• 440
Curie Temperature, °F •••••• <-320
°C •••••• <-196
Permeability at 200 Oersted (15.9 kA/m) •••••• 1.005
Coefficient of Expansion, 70 – 200°F, 10-6 in/in • °F •••••• 7.8
21 – 93°C, μm/m • °C •••••• 14.0
Thermal Conductivity, Btu • in/ft2•h•°F •••••• 76.8
W/m• °C •••••• 11.1
Electrical Resistivity, ohm• circ mil/ft •••••• 678
μΩ•m •••••• 1.13

Specifications and Designation

UNS N08825
BS 3072-3074, 3076 (NA16)
ASTM B163, B423 - B425,
B704, B705, B751
ASME SB-163, SB-423-SB-425,
Boiler Code Sections I, III, VIII, IX
DIN 17744, 17750-17752, 17754
Werkstoff Nr. 2.4858
VdTÜV 432
NACE MR-01-75
AFNOR NFe 32 C20DU

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