INCONEL 718
General
Alloy 718 for the oil industry is heat treated such that the hardness does not exceed 40HRC which is the maximum allowed by NACE MR-01-75 to prevent stress corrosion cracking. The major applications in this field are gate valves, choke stems, fasteners, tubing hangers and fire safe valves. Alloy 718 for aerospace and power generation is heat treated to give maximum strength and high creep resistance with typical hardness values exceeding 42HRC. The major applications are components for gas turbines, aircraft engines, fasteners and other high strength applications.
Chemical Composition
|
Cr |
C |
Si |
Mo |
Mn |
Fe |
Ti |
Al |
Ni |
P |
S |
Min % |
17.00 |
– |
– |
2.80 |
– |
Bal. |
0.65 |
0.20 |
50.00 |
– |
– |
Max % |
21.00 |
0.08 |
0.35 |
3.30 |
0.35 |
– |
1.15 |
0.80 |
55.00 |
0.015 |
0.015 |
Other Elements |
Nb + Ta 4.75 / 5.50 – Co 1.00 max. – B 0.006 max. – Cu 0.30 max. |
Mechanical Properties (Solution Annealed & Aged)
|
MPA |
% |
Tensile Strength. |
1034 min. |
|
Yield Strength (0.2% offset) |
827 to 965 |
|
Elongation in 2” (50mm) or 4D |
|
20 min. |
Reduction of Area, |
|
25 min. |
|
|
|
Hardness |
30 – 40 HRC |
|
Alternative Designations
Inconel 718, Alloy 718, UNS N07718, AMS 5662, AMS 5663, W.Nr. 2.4668 |
The data contained in this publication is for informational purposes only and may be revised at any time without prior notice. The data is believed to be accurate and reliable, but Hague Fasteners Limited makes no representation or warranty of any kind (express or implied) and assumes no liability with respect to the accuracy or completeness of the information contained herein. Although the data is believed to be representative of the product, the actual characteristics or performance of the product may vary from what is shown in this publication. Nothing contained in this publication should be construed as guaranteeing the product for a particular use or application.