Technical center

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


Applications

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


Ksi

MPa

Ksi

MPa

Alloy 625 Bar

Annealed

120

827

60

414

30

≤ 287 HB

Alloy 625 Sheet

Annealed

120

827

60

414

30

145-240

Alloy 625 Tube

Annealed

120

827

60

414

35

-

Seamless and Welded






Pipe Seamless

ASTM B444, ASTM B829, ASME SB 444, ASME SB 829, BS3074 NA21

Pipe Welded

ASTM B705, ASTM B775, ASME SB 705, ASME SB 775

Tube Seamless

ASTM B444, ASTM B829, ASME SB 444, ASME SB 829, AMS 5581, BS3074 NA21, AMS 5581 Type 1

Tube Welded

ASTM B704, ASTM B751, ASME SB 704, ASME SB 704, AMS 5581, AMS 5581 Type 2

Tube

VdTUV 499, ISO 6207, DIN 17751, ASME Code Case 1935

Fittings

ASTM B 366, ASME SB 366

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