Inconel 718(UNS N07718 W.Nr. 2.4668)

1.Inconel 718 INTRODUCTION

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.

2.Inconel 718 STANDARD  PRODUCT FORMS

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

3.Inconel 718 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

4.Inconel 718 LIMITING CHEMICAL  COMPOSITION, %

Ni .....50.0 – 55.0 

Cr...... 17.0 – 21.0 

Fe......Remainder 

Nb....4.75 – 5.50 

Mo.....2.80 – 3.30  

Plus Co.  

Plus Ta. 

Ti ......0.65 – 1.15 

Al ......0.20 – 0.80 

Co ........ 1.0 max.  

C..........0.08 max. 

Mn.......0.35 max. 

If determined. 

Si.........0.35 max. 

P........ 0.015 max. 

S....... 0.015 max. 

B....... 0.006 max. 

Cu........0.30 max.

5.Inconel 718 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 • circ mil/ft............................. 751 

μΩ•m................................................ 1.25

6.Inconel 718 TYPICAL MECHANICAL  PROPERTIES