ALLOY 718 | 2.4668 - Data sheet
UNS N07718 | AMS 5662 | AMS 5663 | ASTM B637 | AMS 5596 | ASTM B670 | DMD 424-22 | API 6A | NACE MR0175
Alloy 718 is a precipitation hardened nickel-chromium alloy with additions of niobium, molybdenum, aluminium and titanium for improved corrosion resistance combined with extremely high strength and excellent weldability, including resistance to cracking after welding. For aerospace applications (AMS 5662/5663) Alloy 718 has excellent creep rupture strength at temperatures up to 700 °C. Alloy 718 achieves its strength through a precipitation hardening heat treatment and can be supplied in the annealed condition (AMS 5662) for ease of fabrication, requiring later heat treatment to develop full strength, or in the fully precipitation strengthened condition (AMS 5663).
Though originally developed for aerospace applications the unique combination of strength and corrosion resistance of alloy 718 made it candidate for applications in the oil and gas sector. As well environments became more severe stress corrosion and hydrogen embrittlement became a challenge the chemistry and microstructure of alloy 718 was optimised to offer the greatest resistance and distinguishes today’s oil field grade (API 6A) from aerospace grades. For oil and gas applications alloy 718 is produced to meet API 6A and NACE MR0175 requirements. The specification API6A has tighter controls on chemistry and is heat treated following a different solution annealing and precipitation hardening procedure as compared to the AMS specifications.
With different specification and heat treatment procedures resulting in optimised properties for the industry sector it is important to understand which specification is required.
Product forms for ALLOY 718 | 2.4668
- 12,70 mm Ø
- 16,00 mm Ø
- 20,00 mm Ø
- 25,00 mm Ø
- 25,40 mm Ø
- 32,00 mm Ø
- 35,00 mm Ø
- 40,00 mm Ø
- 45,00 mm Ø
- 50,80 mm Ø
- 65,00 mm Ø
- 76,20 mm Ø
- 82,50 mm Ø
- 85,00 mm Ø
- 95,00 mm Ø
- 101,60 mm Ø
- 114,30 mm Ø
- 127,00 mm Ø
- 152,40 mm Ø
- 165,10 mm Ø
- 177,80 mm Ø
- 187,32 mm Ø
- 12,70 mm Ø
- 20,00 mm Ø
- 25,40 mm Ø
- 35,00 mm Ø
- 50,80 mm Ø
- 60,00 mm Ø
- 76,20 mm Ø
- 88,90 mm Ø
- 101,60 mm Ø
- 12,70 mm Ø
- 15,88 mm Ø
- 19,05 mm Ø
- 25,40 mm Ø
- 34,925 mm Ø
- 41,20 mm Ø
- 50,80 mm Ø
- 63,50 mm Ø
- 76,20 mm Ø
- 88,90 mm Ø
- 101,60 mm Ø
- 114,30 mm Ø
- 127,00 mm Ø
- 152,40 mm Ø
- 1,00 x 914 mm
- 1,50 x 914 mm
- 2,00 x 914 mm
Plates ≤ 25,4 mm according to AMS 5596
- 12,70 mm
- 16,00 mm
- 25,40 mm
- 32,00 mm
- 44,45 mm
- 50,80 mm
Areas of application for ALLOY 718 | 2.4668
Gas turbine compressor blades, disks and shafts; high strength springs; high strength fasteners; pumps and valves.
Characteristics ALLOY 718 | 2.4668
Chemical composition - limits in %
| Chemical elements | AMS5662/5663 | API 6A |
| Ni | 50,00 - 55,00 | 50,00 - 55,00 |
| Cr | 17,00 - 21,00 | 17,00 - 21,00 |
| Nb | 4,75 - 5,50 | 4,87 - 5,20 |
| Mo | 2,80 - 3,30 | 2,80 - 3,30 |
| Co | max. 1,00 | max. 1,00 |
| Ti | 0,65 - 1,15 | 0,80 - 1,15 |
| Al | 0,20 - 0,80 | 0,40 - 0,60 |
| Mn | max. 0,35 | max. 0,35 |
| Cu | max. 0,30 | max. 0,23 |
| C | max. 0,08 | max. 0,045 |
| P | max. 0,015 | max. 0,010 |
| S | max. 0,015 | max. 0,010 |
| Pb | max. 0,0005 | max. 0,001 |
| Se | max. 0,0003 | max. 0,0005 |
| Bi | max. 0,00003 | max. 0,00005 |
| Fe | Rest | Rest |
Physical constants and thermal properties
| Density | 8,19 g/cm³ |
| Melting point | 1260 - 1336 °C |
| Thermal conductivity at 20°C | 9,5 W/m · °C |
| Coefficient of expansion at 21 - 93°C |
13,1 μm/m · °C |
Typical mechanical properties (room temperature)
| Specification | AMS 5663 | AMS 5596 | API 6A |
|---|---|---|---|
| Yield strength | min. 1034 MPa | min. 1034 MPa | min. 827 MPa |
| Tensile strength | min. 1275 MPa | min. 1240 MPa | min. 1034 MPa |
| Elongation | min. 12% | min. 12% | min. 20% |
| Hardness | 32-40 HRC* |
*NACE MR0175 requires hardness 40 HRC max. only
All information is subject to change without notice. The properties correspond to the material in the heading. They may vary for other specifications. Please contact us for more details.
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+49 4174 66 94-118
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