A nickel-chromium-iron alloy with additions of molybdenum and copper. It has good weldability and resistance to intergranular corrosion in the welded condition. The low carbon content helps prevent sensitization and consequent intergranular corrosion of weld heat-affected zones. Used for flue-gas scrubbers and for handling phosphoric and sulfuric acids.

STANDARD PRODUCT FORMS

Pipe and tube.

MAJOR SPECIFICATIONS

UNS N06985
ASTM B 366, B 581, B 582,
B 619, B 622, B 626,
B 751, B 775, B 829
NACE MR-0175/ISO 15156
ASME SB-366, SB-581, SB-582,
SB-619, SB-622, SB-626,
SB-751, SB-775, SB-829
DIN 17744, 17750 – 17752
Werkstoff Nr. 2.4619
ISO 6207, 6208, 9724

LIMITING CHEMICAL COMPOSITION, %

Ni........Remainder
Cr......21.0 – 23.5
Fe......18.0 – 21.0
Mo..........6.0 – 8.0
Cu..........1.5 – 2.5
Nb^a........0.50 max.
C........ 0.015 max.
W............ 1.5 max.
Si............ 1.0 max.
^aPlus Co.
Mn.......... 1.0 max.
P...........0.04 max.
S...........0.03 max.
Co........... 5.0 max.

PHYSICAL CONSTANTS AND THERMAL PROPERTIES

Density, Ib/in³..........................................................................0.294
g/cm³......................................................................... 8.14
Melting Point, °F......................................................2300 – 2450
°C......................................................1260 – 1340
Specific Heat, Btu/lb •°F.....................................................0.108
J/kg •°C........................................................... 452
Coefficient of Expansion, 70 – 200°F, 10^-6 in/in •°F........8.1
24 – 100°C, μm/m •°C.......... 14.6
Thermal Conductivity, Btu • in/ft²• h•°F...............................69
W/m•°C........................................... 10.0

TYPICAL MECHANICAL PROPERTIES

INCONEL HX

INCONEL C-276