Inconel 625
1. Resistant to a wide range of corrosive media.
2. Virtually immune to chlorine ion stress corrosion cracking
3. Non-magnetic
4. Excellent mechanical properties
5. High strength and good weldability under a wide range of temperatures
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Description

INCONEL ALLOY 625

UNS Number N06625

Other common names: Alloy 625

Inconel 625 is a corrosion and oxidation resistant nickel alloy that is used both for its high strength and outstanding aqueous corrosion resistance. Its outstanding strength and toughness is due to the addition of niobium which acts with the molybdenum to stiffen the alloy’s matrix. Alloy 625 has excellent fatigue strength and stress-corrosion cracking resistance to chloride ions. This nickel alloy has excellent weldability and is frequently used to weld AL-6XN. This alloy resists a wide range of severely corrosive environments and is especially resistant to pitting and crevice corrosion. Some typical applications Inconel 625 is used in are chemical processing, aerospace and marine engineering, pollution-control equipment, and nuclear reactors.

 

In what form is Inconel 625?

· Sheet

· Plate

· Bar

· Pipe & Tube (welded & seamless)

· Wire

 

What are the characteristics of Inconel 625?

· High creep-rupture strength

· Oxidation resistant to 1800° F

· Seawater pitting and crevice corrosion resistant

· Immune to chloride ion stress corrosion cracking

· Non-magnetic

 

Chemical Composition(%)

CrNiMoCo + NbTaAlTiC
20.00-30.00Remainder8.0-10.01.0 max3.15-4.15.40 max.40 max.10 max

 

FeMnSiPS


5.0 max.50 max.50 max.015 max.015 max


 

In what applications is Inconel 625 used?

· Aircraft ducting systems

· Aerospace

· Jet engine exhaust systems

· Engine thrust-reverser systems

· Specialized seawater equipment

· Chemical process equipment

Fabrication with Inconel 625

Alloy 625 has excellent forming and welding characteristics. It may be forged or hot worked providing temperature is maintained in the range of about 1800-2150° F. Ideally, to control grain size, finish hot working operations should be performed at the lower end of the temperature range. Because of its good ductility, alloy 625 is also readily formed by cold working. However, the alloy does work-harden rapidly so intermediate annealing treatments may be needed for complex component forming operations. In order to restore the best balance of properties, all hot or cold worked parts should be annealed and rapidly cooled. This nickel alloy can be welded by both manual and automatic welding methods, including gas tungsten arc, gas metal arc, electron beam and resistance welding. It exhibits good restraint welding characteristics.

ASTM Specifications

Pipe SmlsPipe WeldedTube SmlsTube WeldedSheet/PlateBarForgingFittingWire
B444B705B444B704B443B446---


Mechanical Properties 
Representative Tensile Properties, bar, 1800° F anneal

Temp° FTensile (psi).2% Yield (psi)Elongation in 2 “ (%)
70144,00084,00044
400134,00066,00045
600132,00063,00042.5
800131,50061,00045
1000130,00060,50048
1200119,00060,00034
140078,00058,50059
160040,00039,000117