625
Product Information
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Alloy 625 is used both for its high strength and outstanding aqueous corrosion resistance. The strength of alloy 625 is primarily a solid solution effect from molybdenum and columbium. Alloy 625 has excellent weldability and is frequently used to weld AL-6XN® alloy. Matching filler metals are also used to join dissimilar metals.
Specifications
UNS N06625, Werkstoff 2.4856, EN 2.4856
ASTM B 443 Gr 1, ASTM B 446 Gr 1
ASME SB-443 Gr 1, ASME SB-446 Gr 1, ASME SFA-5.14, ASME Sect. IX P No. 43
NACE MR0175-3, ISO 15156-3
AMS 5599, ASM 5666, ASM 5837
Inventory
Alloy 625 Plate, Alloy 625 Sheet, Alloy 625 Coil, Alloy 625 Bar, Alloy 625 Welding Products
Common Trade Names
Inconel 625, Alloy 625, Nickel 625
Chemical Composition, %
| Cr | Ni | Mo | Co | Cb+Ta | Al | Ti | C | Fe | Mn | Si | P | S | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MIN | 20.0 | - | 8.0 | - | 3.15 | - | - | - | - | - | - | - | - |
| MAX | 23.0 | Balance | 10.0 | 1.0 | 4.15 | 0.4 | 0.4 | 0.1 | 5.0 | 0.5 | 0.5 | 0.015 | 0.015 |
Features
- High creep-rupture strength
- Oxidation resistant to 1800°F
- Good fatigue resistance
- Excellent weldability
- Outstanding resistance to chloride pitting and crevice corrosion
- Immune to chloride ion stress corrosion cracking
- Resistant to seawater under both flowing and stagnant conditions and under fouling
Applications
- Aircraft ducting systems
- Jet engine exhaust systems
- Engine thrust-reverser systems
- Bellows and expansion joints
- Turbine shroud rings
- Flare stacks
- Seawater components
- Chemical process equipment handling mixed acids both oxidizing and reducing.
Physical Properties
Density: 0.305 lb/in3
Melting Point: 2350-2460°F
| Temperature, °F | 70 | 400 | 600 | 800 | 1000 | 1200 | 1400 | 1600 |
| Coefficient* of Thermal Expansion, in/in°F x 10-6 | - | 7.3 | 7.4 | 7.6 | 7.8 | 8.2 | 8.5 | 8.8 |
| Thermal Conductivity Btu • ft/ft2 • hr • °F |
5.7 | 7.2 | 8.2 | 9.1 | 10.1 | 11.0 | 12.0 | 13.2 |
| Modulus of Elasticity, Dynamic psi x 106 | 30 | 28 | 28 | 27 | 26 | 24 | 23 | - |
* 70°F to indicated temperature.
Mechanical Properties
Representative Tensile Properties, Bar
| Temperature,°F | 70 | 400 | 600 | 800 | 1000 | 1200 | 1400 | 1600 |
| Ultimate Tensile Strength, ksi | 144 | 134 | 132 | 132 | 130 | 119 | 78 | 40 |
| 0.2% Yield Strength, ksi | 84 | 66 | 63 | 61 | 61 | 60 | 59 | 39 |
| Elongation, % | 44 | 45 | 42.5 | 45 | 48 | 34 | 59 | 117 |
Typical Rupture Strength Bar, Stress to Rupture at Indicated Time
| Temperature, °F | 1200 | 1300 | 1400 |
| 100 Hours, ksi | 59 | 34 | 18 |
| 1,000 Hours, ksi | 43 | 23 | 12 |
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