A nickel-iron-chromium alloy with additions of molybdenum and copper. It has excellent resistance to both reducing and oxidizing acids, stress-corrosion cracking and localized attack such as pitting and crevice corrosion. The alloy is especially resistant to sulfuric and phosphoric acids. Used for chemical processing, pollution-control equipment, oil and gas well piping, nuclear fuel reprocessing, acid production and pickling equipment.

STANDARD PRODUCT FORMS

Pipe, tube, sheet, strip, plate, round bar, flat bar, forging
stock, hexagon and wire.

MAJOR SPECIFICATIONS

UNS N08825
BS 3072 – BS 3074, 3076 (NA16)
ASTM B 163, B 366,
B 423 – B 425, B 564, B 704,
B 705, B 751, B 775, B 829
Werkstoff Nr. 2.4858
VdTÜV 432
NACE MR-0175/ISO 15156
ASME SB-163, SB-366,
SB-423 – SB-425, SB-564,
SB-704, SB-705, SB-751,
SB-775, SB-829
ASME Code Cases 1936, N-572
DIN 17744, 17750 – 17754
ISO 6207, 6208, 9723 – 9725

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............ 0.2 max.

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, 10^-6 in/in•°F (μm/m•°C)
70-200°F (21-93°C)......................... 7.8 (14.0)
Thermal Conductivity^A, Btu•in/ft²•h•°F.................................... 76.8
W/m•°C.................................................. 11.1
Electrical Resistivity^A, ohm•circ mil/ft.....................................678
μΩ•m.....................................................1.13

TYPICAL MECHANICAL PROPERTIES

INCOLOY 864

INCOLOY 803