718

Inconel 718

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Product Description

Inconel 718

Inconel 718

Inconel 718 Alloy is a precipitation-hardenable Ni-Cr-Fe alloy containing significant amounts of Nb & Mo as well as lesser amounts of Al+Ti. The alloy has good ductility in the annealed condition and high strength up to 700 ℃.
•good fabrication characteristics in the annealed condition
•good tensile, fatigue and creep-rupture strengths
•high-temperature strength up to 700℃
•good oxidation resistance up to 1000 ℃
•excellent mechanical properties in cryogenic environments
•excellent corrosion resistance at high and low temperatures and good resistance to stress-corrosion cracking and pitting corrosion
•good weldability by arc and resistance welding processes without susceptibility to post-weld cracking

Density: 8.19
Corrosion resistance

The high chromium and molybdenum contents of Inconel 718 Alloy impart excellent resistance to uniform and localized corrosion, such as pitting in many media at both high and low temperatures. The chromium also enables it to withstand chloride-ion stress-corrosion cracking which makes it an excellent alloy for service in oil and sour gas (H2S containing) environments as well as seawater.
Inconel 718 Alloy is generally only used for applications not exceeding 700 ℃. However, oxidation resistance up to 1000 ℃ is particularly high and comparable to that of other gamma-prime strengthened superalloys

Applications of Inconel 718:

Due to its high-temperature strength up to 700℃, excellent corrosion resistance and ease of fabrication Inconel 718 Alloy finds applications in many fields. Initially it was used as a turbine disk material in aircraft jet engines. Here resistance to creep and stress rupture was most important.
Because of its properties, fabricability and cost effectiveness it has since gained wider acceptance. To-day applications vary from highly stressed rotating and static components in gas turbines and rocket engines to high-strength bolting, springs and fasteners, components in nuclear reactors and space vehicles as well as high-temperature tooling for extrusion, of for example copper, and shearing. Another more recent important application involves pump shafts and other highly stressed well head and downhole components in offshore
and marine engineering. Particularly useful is the alloy for drilling equipment in sour (containing H2S, CO2 and chlorides) oil and gas wells.

Chemical composition

 Ni  Cr  Fe  C  Mn  Si  Cu  Mo  Co  Nb  Al  Ti  B  P  S
 min(%)  50.0 17.0  bal.  2.80 4.75  0.20  0.65
 max(%)  55.0  21.0  0.08  0.35  0.35  0.30  3.30  5.50  0.80  1.15  0.006  0.015  0.015

Mechanical properties

 Condition  Yield Strength(Mpa)  Tensile Strength(Mpa)  Elongation(%)  Reduction of Area(%)  Hardness(HB)
 ASTM Min Value  Solution Annealed + Aged  1034  1275  12  15  331
 Typical Values at RT  Solution Annealed + Aged  1176  1343  17 382

International Specification Comparison chart

 Material  Round Bar  Plate  Pipe
 Seamless  Welded
 ASTM  UNS
N07718
 B673  B670
 ASME  SB673  SB670
 JIS  NCF718  H4553  G4901  H4552
 DIN  2.4668  17752  17750  17751

Product: Sheet, Coil, Pipe, Bar, Wire and Forgings