Inconel® 625 Nickel Alloy – AMS 5666 – UNS N06625
Nickel Alloy 625, frequently called Inconel® 625, is a corrosion and heat-resistant Nickel-based alloy.
It is alloyed with Chromium and Iron, along with Niobium-Tantalum and Molybdenum for increased toughness and strength. It is nonmagnetic, and corrosion and oxidation-resistant, with service temperatures ranging from cryogenic to 1800°F. Because of its alloy matrix, precipitation hardening treatments are not required. This alloy is generally double-melted, with either EF-AOD melt (Electric Furnace followed by Argon Oxygen Decarburization) or VIM (Vacuum Induction Melt); and with a second melt by either VAR (Vacuum Arc Remelt), or ESR (Electroslag Reduction).
This alloy exhibits excellent corrosion resistance to salt and fresh water, alkaline environments, and air. It is resistant to both oxidizing and non-oxidizing environments, and chloride stress corrosion cracking. Chloride stress corrosion cracking resistance is excellent. The alloy resists scaling and oxidation at high temperatures.
<<Inconel® 625 Nickel Alloy – AMS 5666 – UNS N06625 DATA SHEET>>
Chemical Composition:
| Symbol | Element | Min % | Max % |
| C | Carbon | – | 0.10% |
| Mn | Manganese | – | 0.50% |
| Si | Silicon | – | 0.50% |
| P | Phosphorus | – | 0.015% |
| S | Sulfur | – | 0.015% |
| Cr | Chromium | 20.00% | 23.00% |
| Mo | Molybdenum | 8.00% | 10.00% |
| Cb (Nb) | Columbium (Niobium) | 3.15% | 4.15% |
| Co | Cobalt | – | 1.00% |
| Ti | Titanium | – | 0.40% |
| Al | Aluminum | – | 0.40% |
| Fe | Iron | – | 5.00% |
| Ni | Nickel | remainder | – |
Annealed Longitudinal Tensile Properties per AMS 5666
| Property | Up to 4″, incl. | Over 4″ to 10″, incl. |
| Tensile Strength | 120 ksi | 110 ksi |
| Yield Strength 0.2% offset | 60 ksi | 50 ksi |
| Elongation in 4D | 30% | 25% |
| Hardness | 287 Bhn max | 287 Bhn max |
Inconel®625 Nickel Applications:
Nickel Alloy 625 aerospace applications include jet engine exhaust systems, propeller blades, heat exchangers, and aircraft applications. It’s also used for heat shields, furnace hardware, chemical plant equipment, and seawater applications.
Common Trade Names:
Nickel 625
625 Alloy
CarTech Pyromet® Alloy 625
W-No 2.4856
ISO NW6625
Inconel 625
Haynes 625
Nickelvac 625
Nicrofer 6020
Altemp 625
Chronic 625
Common Specifications:
AMS 5666 Bars, Forgings, Extrusions
AMS 5599 Sheet, Strip, Plate
AMS 5837 Welding Wire
AMS 5869 Sheet, Strip, Plate
ASTM B446
ASME SB446
ASTM B564
MS 5837
ASME SB443 Gr 1, SB446 Gr 1
ASTM B443 Gr 1, B446 Gr 1
EN 2.4856
ISO 15156-3
NACE MR0175-3
UNS N06625
Werkstoff 2.4856
DIN 17752
Rod, Bar, Wire and Forging Stock
