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Alloy 718 
2.4668 – N07718

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Material description

The material 2.4668 is a precipitation-hardenable nickel-chromium alloy. In addition to iron, niobium and molybdenum, the material also contains small amounts of aluminium and titanium.

The alloy 2.4668 (Alloy 718) has good corrosion resistance and high strength. The material is also resistant to the formation of welding cracks. 2.4668 has very good creep rupture strength at temperatures of up to approx. 750 °C and high fatigue strength in the temperature range between -250 °C and 700 °C. The alloy is also oxidation-resistant up to approx. 980 °C.

AN OVERVIEW OF THE PROPERTIES OF 2.4668:

  • Good corrosion resistance
  • High strength
  • Resistant to the formation of welding cracks
  • High creep and fatigue strength
  • Good oxidation resistance

Applications

  • Gas turbines
  • Nuclear technology
  • Space travel
  • Rocket engines

Material data

Material no.: 2.4668
Name: Alloy 718
UNS no.: N07718
ASTM: B637
VdTÜV: —
Other: DIN EN 10302, API 6A718
Material type: Superalloy
Data sheet

Chemical composition in %

ASTM B637DIN EN 10302API 6A718
Cmax. 0,080,020 – 0,08max. 0,045
Mn, max.0,350,350,35
Si, max.0,350,350,35
P, max.0,0150,0150,010
S, max.0,0150,0150,010
Cr17,0 – 21,017,0 – 21,017,0 – 21,0
Co, max.1,01,001,00
Mo2,80 – 3,302,80 – 3,32,80 – 3,30
Nb + Ta4,75 – 5,504,7 – 5,54,87 – 5,20
Ti0,65 – 1,150,60 – 1,200,80 – 1,15
Al0,20 – 0,800,30 – 0,700,40 – 0,60
Bmax. 0,0060,002 – 0,006max. 0,0060
FeRestRestRest
Cu, max.0,300,300,23
Ni50,0 – 55,050,0 – 55,050,0 – 55,0
Pb, max.0,0010
Se, max.0,0005
Bi, max.0,00005
Ca, max.*0,0030
Mg, max.*0,0060
*Optional

Mechanical properties

solution annealed + precipitation hardenedBar |
forging		Bar | forging
D ≤ 160 mm		Bar | forging
D < 76 mm / 76 mm ≤ D ≤ 254 mm / D > 254 mm
Rm (MPa)≥ 1275≥ 1230≥ 1034
Rp 0,2 (MPa)≥ 1034≥ 1030827 – 1000
A (%)≥ 12≥ 12≥ 20
Z (%)≥ 15≥ 35 / ≥ 35 / ≥ 25
Av (J) bei -60 °Cl ≥ 68 (61)* / q ≥ 47 (41)* / q ≥ 41 (37)*
lateral expansion (mm)≥ 0,38
Hardness≥ 331 HB32 – 40 HRC
*Single value

The specified values are non-binding guide values.

Data sheet

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