The picture of ASME SB-446 Inconel 625 rod
625
Inconel 625 is a nickel-base alloy 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.
Chemistry
| 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 | ||
Alloy form
Plate, round bar, sheet, welding products
Common trade names
Inconel 625, Alloy 625, Nickel 625
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/in 3
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 | 5.7 | 7.2 | 8.2 | 9.1 | 10.1 | 11.0 | 12.0 | 13.2 |
Modulus of elasticity, dynamic psi x 10 6 | 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 |
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