Inconel Alloy 625 (UNS designation N06625) is a nickel-based superalloy that possesses high strength properties and resistance to elevated temperatures. It also demonstrates remarkable protection against corrosion and oxidation. Its ability to withstand high stress and a wide range of temperatures, both in and out of water, as well as being able to resist corrosion while being exposed to highly acidic environments makes it a fitting choice for nuclear and marine applications.
Inconel 625 was developed in the 1960s with the purpose of creating a material that could be used for steam-line piping. Some modifications were made to its original composition that have enabled it to be even more creep-resistant and weldable. Because of this, the uses of Inconel 625 have expanded into a wide range of industries such as the chemical processing industry, and for marine and nuclear applications to make pumps and valves and other high-pressure equipment.
Because of the metal's high Niobium (Nb) levels as well as its exposure to harsh environments and high temperatures, there was concern about the weldability of Inconel 625. Studies were therefore conducted to test the metal's weldability, tensile strength and creep resistance, and Inconel 625 was found to be an ideal choice for welding. Other well-known names for Inconel 625 are Haynes 625, Nickelvac 625, Nicrofer 6020, Altemp 625 and Chronic 625
Seawater components
Flare stacks
Aircraft ducting systems
Fabrication with Inconel 625
Specialized seawater equipment
Chemical process equipment
Turbine shroud rings
Engine thrust reverser systems.
Jet engine exhausts systems
Boiler furnaces
| Chemical Composition Limits | |||||||||||||
|
Weight % |
Ni |
Cr |
Mo |
Nb + Ta |
Fe |
Ti |
C |
Mn |
Si |
S |
P |
Al |
Co |
|
Alloy 625 |
58.0 min |
20 - 23 |
20-23 |
3.15 -4.15 |
5.0 max |
0.40 max |
0.10 max |
0.50 max |
0.50 max |
0.15 max |
0.15 max |
0.40 max |
1.0 max |
| Typical Mechanical Properties | |||||||||||||
|
Material |
Form and Condition |
Tensile Strength MPa |
Yield Strength (0.2% Offset) MPa |
Elongation 4D(%) |
Hardness HB |
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|
|
Ksi |
MPa |
Ksi |
MPa |
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|
Alloy 625 Bar |
Annealed |
120 |
827 |
60 |
414 |
30 |
≤ 287 HB |
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|
Alloy 625 Sheet |
Annealed |
120 |
827 |
60 |
414 |
30 |
145-240 |
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|
Alloy 625 Tube |
Annealed |
120 |
827 |
60 |
414 |
35 |
- |
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|
Seamless and Welded |
|
|
|
|
|
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|
Pipe Seamless |
ASTM B444, ASTM B829, ASME SB 444, ASME SB 829, BS3074 NA21 |
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|
Pipe Welded |
ASTM B705, ASTM B775, ASME SB 705, ASME SB 775 |
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|
Tube Seamless |
ASTM B444, ASTM B829, ASME SB 444, ASME SB 829, AMS 5581, BS3074 NA21, AMS 5581 Type 1 |
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|
Tube Welded |
ASTM B704, ASTM B751, ASME SB 704, ASME SB 704, AMS 5581, AMS 5581 Type 2 |
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|
Tube |
VdTUV 499, ISO 6207, DIN 17751, ASME Code Case 1935 |
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|
Fittings |
ASTM B 366, ASME SB 366 |
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