General Information
Chemical Composition
Physical Properties
Mechanical Properties
General Information
Inconel® 625 is a nickel-based superalloy with excellent resistance to oxidation and
corrosion, in conditions ranging from jet engine propulsion systems to chemical processing of oxidizing and reducing
acids. The nickel-chromium matrix of Inconel® 625 is reinforced by the addition of molybdenum and niobium, which
is alloyed through solid solution strengthening, and this allows it to maintain high strength and toughness at
temperatures ranging from cryogenic up to 2000°F (1093°C). It is non-magnetic, austenitic, and displays high tensile
strength, fabricability, and brazeability. Due to its high nickel content, this alloy is nearly immune to chloride ion
stress-corrosion cracking and pitting, which is commonly found in metals in seawater applications like heat exchangers, fasteners, and cable sheathing.
Standard Inventory Specifications
- 625 Sheet, Coil and Plate:
- UNS N06625
- UNS N06626-625LCF
- AMS 5599
- ASTM B 443 Gr 1
- ASME SB 443 Gr 1
- 625 Bar:
- UNS N06625
- UNS N06626-625LCF
- AMS 5666
- ASTM B 446
Other industry standards we comply with:
- EMS95377
- EN 2.4856
- EN 10204
- DFARS Compliant
- RR SABRe Edition 2
- S1000 / S-SPEC-1
- GE Aviation S-SPEC-35 AeDMS S-400
- PWA LCS
Common Trade Names
- Alloy 625
- Nickel 625
- Inconel 625 (® Special Metals)
- Haynes 625 (® Haynes International)
Common Applications of 625
- Aerospace components
- Propeller blades
- Submarine propulsion motors
- Utility boat exhaust ducts
- Steam-line bellows
Chemical Composition
Chemical Composition of Inconel 625
Element
Percent by Weight
C
Carbon
0.010 maximum
Mn
Manganese
0.50 maximum
P
Phosphorous
0.015 maximum
S
Sulfur
0.015 maximum
Si
Silicon
0.50 maximum
Cr
Chromium
20.00 – 23.00
Ni
Nickel
Balance
Mo
Molybdenum
8.00 – 10.00
Nb
Columbium
3.15 – 4.15
Ti
Titanium
0.40 maximum
Al
Aluminum
0.40 maximum
Ta
Tantalum
0.05 maximum
Fe
Iron
5.00 maximum
Physical Properties
Physical Properties
- Density: 0.303 lb/in3 (8.44 g/cm3
- Specific Gravity: 8.44
- Melting Range: 2350 – 2460°F (1280 – 1350°C)
- Specific Heat: 0.098 Btu/lb x °F (410 Joules/kg x °K)
- Magnetic Permeability (75°F, 200 oersted): 1.0006
Thermal Conductivity
Temperature Range | Linear Coefficients of Thermal Expansion1 · 10-6 | Thermal Conductivity2 3 | |||
°C | °F | /°C | /°F | W/m·K | Btu/(hr/ ft²/in/°F) |
-157 | -250 | – | – | 7.3 | 4.2 |
-129 | -200 | – | – | 7.4 | 4.3 |
-73 | -100 | – | – | 8.3 | 4.8 |
-18 | 0 | – | – | 9.2 | 5.3 |
21 | 70 | – | – | 9.9 | 5.7 |
38 | 100 | – | – | 10.0 | 5.8 |
93 | 200 | 12.8 | 7.1 | 10.7 | 6.3 |
204 | 400 | 13.1 | 7.3 | 12.6 | 7.3 |
316 | 600 | 13.3 | 7.4 | 14.2 | 8.2 |
427 | 800 | 13.7 | 7.6 | 15.7 | 9.1 |
538 | 1000 | 14.0 | 7.8 | 17.5 | 10.1 |
649 | 1200 | 14.8 | 8.2 | 19.0 | 11.0 |
760 | 1400 | 15.3 | 8.5 | 20.8 | 12.0 |
871 | 1600 | 15.8 | 8.8 | 22.8 | 13.2 |
927 | 1700 | 16.2 | 9.0 | – | – |
982 | 1800 | – | – | 25.3 | 14.6 |
Average coefficient from 70°F (21°C) to temperature shown
Measurements made at Battelle Memorial Institute
Material annealed 2100°F (1149°C)
Electrical Resistivity
Temperature | microhm-cm | ||
°C | °F | ||
21 | 70 | 128.9 | |
38 | 100 | 129.6 | |
93 | 200 | 131.9 | |
204 | 400 | 133.9 | |
316 | 600 | 134.9 | |
427 | 800 | 135.9 | |
538 | 1000 | 137.9 | |
649 | 1200 | 137.9 | |
760 | 1400 | 136.9 | |
871 | 1600 | 135.9 | |
982 | 1800 | 134.9 | |
1093 | 2000 | 133.9 |
Mechanical Properties
Mechanical Properties
- Mechanical Properties and Yield Strength
- Mechanical Properties and Yield Strength of Alloy 625
Temperature | 0.2% Yield Strength | Ultimate Tensile Strength | Elongation Percent | ||||
°F | °C | psi | MPa | psi | MPa | ||
1920 | 1065 | 63, 000 | 430 | 136, 000 | 940 | 51.5 |

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