Inconel 725
Description:
Alloy 725 / Inconel 725 is a nickel chromium-molybdenum-niobium alloy that is highly resistant to corrosion and is age hardenable for extremely high strength. It has essentially the same corrosion resistance as INCONEL alloy 625, which is widely used in a broad range of severely corrosive environments. The strength of age-hardened Alloy 725 is of the order of twice that of annealed alloy 625. Alloy 725 strength is developed by heat treatment rather than by cold work this also enables strength to be imparted to large non-uniform sections that cannot be strengthened by cold works.
Chemical Compositions:
|
Elements |
Content (%) |
|
Nickel, Ni |
55 - 59 |
|
Chromium, Cr |
19 - 22.5 |
|
Iron, Fe |
9 |
|
Molybdenum, Mo |
7 - 9.50 |
|
Niobium, Nb (Columbium, Cb) |
2.75 - 4 |
|
Titanium, Ti |
1 - 1.70 |
|
Aluminum, Al |
0.35 |
|
Manganese, Mn |
0.35 |
|
Silicon, Si |
0.20 |
|
Carbon, C |
0.030 |
|
Phosphorous, P |
0.015 |
|
Sulfur, S |
0.010 |
Mechanical Properties:
|
|
Condition |
Yield Strength (0.2% Offset) |
Tensile Strength |
Elongation % |
Hardness, Rc |
||
|
ksi |
MPa |
ksi |
MPa |
||||
|
Alloy 725 round |
Annealed |
62.0 |
427 |
124.0 |
855 |
57 |
5 |
|
Alloy 725 round |
Age Hardened |
133.0 |
917 |
180.0 |
1241 |
30 |
36 |
Specifications:
Bar and Wire ASTM B 805, ASME Code Case 2217
Bar and Forging Stock SMC Specification HA91, ASME Code Case 2217
UNS N07725
FMC Spec M40504
NACE MR-0175/ ISO 15156
Inconel 725
Applications:
Hangers, landing nipples and high strength fasteners in marine applications.