Limiting Chemical Composition, %

Nia - 70.0 min.
Cr - 14.0-17.0
Fe - 5.0-9.0
Ti - 2.25-2.75
Al - 0.40-1.00
Nbb - 0.70-1.20
C - 0.08 max.
Mn - 1.00 max.
Si - 0.50 max.
S - 0.01 max.
Cu - 0.50 max.
Coc - 1.00 max.
aPlus Co.
bPlus Ta.
cIf determined.

Typical Mechanical Properties
(Precipitation Hardened)

Rupture Strength (1000 h)

Physical Constants and Thermal Properties

Density, Ib/in3 •••••• 0.299
g/cm3 •••••• 8.28
Melting Range, °F •••••• 2540 – 2600
°C ••••••1390 – 1430
Specific Heat, Btu/lb •°F •••••• 0.103
J/kg • °C •••••• 431
Curie Temperature, °F •••••• -193
°C •••••• -125
Permeability at 200 Oersted (15.9 kA/m) •••••• 1.0035
Coefficient of Expansion, 70 – 200°F, 10-6 in/in • °F •••••• 7.0
21 – 93°C, μm/m • °C •••••• 12.6
Thermal Conductivity, Btu • in/ft2•h•°F •••••• 83
W/m• °C •••••• 12.0
Electrical Resistivity, ohm• circ mil/ft •••••• 731
μΩ•m •••••• 1.22

Specifications and Designation

UNS N07750
BS HR505
ASTM B 637
ASME SB-637,
Boiler Code Section III
Werkstoff Nr. 2.4669
SAE AMS 5542, 5582, 5583,
5598, 5667-5671, 5698,
5699, 5747, 7246
MIL-N-7786,
MIL-N-8550,
MIL-S-23192,
MIL-N-24114
NACE MR-01-75
AFNOR NC 15 FeT

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