INCONEL 693

A nickel-chromium-aluminum alloy offering the best resistance to metal dusting of any available conventional alloy. Alloy 693 also offers exceptional resistance to oxidation and carburization at temperatures up to 2100°F (1150°C) with excursions to even higher temperatures. The alloy’s ability to resist metal dusting is especially useful in systems used to reform hydrogen and generate synthesis gas for various industries, including gas and liquid fuel production. Alloy 693 is protected by U.S. Patent Number 4,882,125.

Plate, sheet, strip, bar, seamless tubes and pipes.

UNS N06693
ASTM B 166, B 167, B 168
ASME SB 166, SB 167, SB 168

Ni..... Remaindera
Cr...... 27.0 – 31.0
Fe..............2.5-6.0
Al...............2.5-4.0
Nb.............0.5-2.5
Mn.......... 1.0 max.
Ti............ 1.0 max.
Cu........0.50 max.
Si..........0.50 max.
C...........0.15 max.
S........ 0.015 max.
^aElement determined arithmetically by difference.

Density, Ib/in³.........................................................................0.280
g/cm³..........................................................................7.77
Melting Range, °F...................................................2403 – 2493
°C...................................................1317 – 1367
Specific Heat, Btu/lb•°F......................................................0.109
J/kg•°C............................................................ 455
Permeability at 200 Oersted.......................................... <1.005
Electrical Resistivity^A, ohm•circ mil/ft............................... 702.7
Thermal Conductivity^A, Btu•in/ft2•h•°F................................. 64.3
W/m•°C.................................................9.1
Coefficient of Expansion, 10^-6 in/in•°F (μm/m•°C)
70-200°F (21–93°C)....................7.22 (13.04)
Young’s Modulus^A, 10³ psi.................................................... 28.5
GPa........................................................... 197
Shear Modulus^A, 10³ psi........................................................ 11.0
GPa..................................................................76
Poisson’s Ratio^A....................................................................... 0.30
^ARoom temperature, as aged.