Inconel 718 Pipes

Product Details

Inconel alloy 718 is a precipitation-hardenable nickel-chromium alloy also containing significant amounts of iron, niobium and molybdenum along with lesser amounts of aluminum and titanium. It combines corrosion resistance and high strength with outstanding weldability, including resistance to post-weld cracking. The alloy has excellent creep-rupture strength at temperatures to 1300°F (700°C). Used in gas turbines, rocket motors, spacecraft, nuclear reactors, pumps and tooling. INCONEL alloy 718SPF is a special version designed for superplastic forming.

STANDARD PRODUCT FORMS
Pipe, tube, sheet, strip, plate, round bar, flat bar, forgingstock, hexagon, wire and extruded section.

MAJOR SPECIFICATIONS
UNS N07718, N07719
ASTM B 637, B 670
ASME SB-637, SB-670
DIN 17744, 17750-17754
SAE AMS 5589, 5590, 5596,
5597, 5662 – 5664, 5832,
5914, 5950, 5962
Werkstoff Nr. 2.4668
ASME Code Cases 1993, 2206,
2222, N-62, N-208, N-253
NACE MR-0175/ISO 15156
AECMA Pr EN 2404,
2405, 2407, 2408,
2952, 2961, 3219, 3666
ISO 6208, 9723 – 9725

LIMITING CHEMICAL COMPOSITION, %
Nia......50.0 – 55.0
Cr....... 17.0 – 21.0
Fe.......Remainder
Nbb.....4.75 – 5.50
Mo......2.80 – 3.30
aPlus Co. bPlus Ta.
Ti.......0.65 – 1.15
Al.......0.20 – 0.80
Coc......... 1.0 max.
C...........0.08 max.
Mn........0.35 max.
cIf determined.
Si..........0.35 max.
P......... 0.015 max.
S........ 0.015 max.
B........ 0.006 max.
Cu........0.30 max.

PHYSICAL CONSTANTS AND THERMAL PROPERTIES
Density, Ib/in3..........................................................................0.296
g/cm3......................................................................... 8.19
Melting Point, °F......................................................2300 – 2437
°C......................................................1260 – 1336
Specific Heat, Btu/lb •°F.....................................................0.104
J/kg •°C........................................................... 435
Curie Temperature, °F........................................................... -170
°C.......................................................... -112
Permeability at 200 Oersted (15.9 kA/m).................. 1.0011
Coefficient of Expansion, 70 – 200°F, 10-6 in/in •°F........ 7.2
21 – 93°C, μm/m •°C............. 13.0
Thermal Conductivity, Btu • in/ft2•h•°F...............................79
W/m•°C........................................... 11.4
Electrical Resistivity, ohm • circmil/ft.............................. 751
μΩ•m.................................................1.25
TYPICAL MECHANICAL PROPERTIES