A nickel-chromium-molybdenum alloy with an addition of niobium that acts with the molybdenum to stiffen the alloy's matrix and thereby provide high strength without a strengthening heat treatment. The alloy resists a wide range of severely corrosive environmentsand is especially resistant to pitting and crevice corrosion. Used in chemical processing,aerospace and marine engineering, pollutioncontrol equipment and nuclear reactors.

STANDARD PRODUCT FORMS

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

MAJOR SPECIFICATIONS

UNS N06625
ASTM B 366, B 443, B 444,
B 446, B 564, B 704,
B 705, B 751, B 775, B 829
ASME SB-366, SB-443, SB-444,
SB-446, SB-564, SB-704,
SB-705, SB-751, SB-775,
SB-829
ASME Code Case 1935
SAE AMS 5581, 5599, 5666,
5837, 5869, MAM 5599
BS 3072, 3074, 3076 (NA21)
DIN 17744, 17750 – 17754
Werkstoff Nr. 2.4856
NACE MR-0175/ISO 15156
VdTÜV 499, EN 10095
ISO NW6625, ISO 6207,
6208, 9723 – 9725, 4955A

LIMITING CHEMICAL COMPOSITION, %

Ni...........58.0 min.
Cr.......20.0 – 23.0
Mo....... 8.0 – 10.0
Nb^{a^{....3.15 – 4.15

^aPlus Co.

Fe........... 5.0 max.

C...........0.10 max.

Mn........0.50 max.

Si..........0.50 max.

S........ 0.015 max.

Al..........0.40 max.

Ti..........0.40 max.

P......... 0.015 max.

Co^b......... 1.0 max.

bIf determined.}}

PHYSICAL CONSTANTS AND THERMAL PROPERTIES

Density, Ib/in³.........................................................................0.305
g/cm³......................................................................... 8.44
Melting Range, °F....................................................2350 – 2460
°C....................................................1290 – 1350
Specific Heat, Btu/lb•°F.....................................................0.098
J/kg•°C............................................................ 410
Curie Temperature, °F........................................................<-320
°C........................................................<-196
Permeability at 200 Oersted (15.9 kA/m)................... 1.0006
Coefficient of Expansion, 70 – 200°F, 10^-6 in/in •°F........ 7.1
21 – 93°C, μm/m • °C............. 12.8
Thermal Conductivity, Btu • in/ft²•h•°F...............................68
W/m • °C.............................................9.8
Electrical Resistivity, ohm •circ mil/ft................................ 776
μΩ•m................................................. 1.29

TYPICAL MECHANICAL PROPERTIES

INCONEL 625LCF

INCONEL 617