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INCONEL® ALLOY 625Download

 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 available?
• 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, %
Cr Ni Mo Co + Nb Ta Al Ti C
20.00-30.00 Remainder 8.0-10.0 1.0 max 3.15-4.15 .40 max .40 max .10 max
Fe Mn Si P S
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 Smls Pipe Welded Tube Smls Tube Welded Sheet/Plate Bar Forging Fitting Wire
B444 B705 B444 B704 B443 B446 - - -
Mechanical Properties
Representative Tensile Properties, bar, 1800° F anneal
Temp° F Tensile (psi) .2% Yield (psi) Elongation in 2 “ (%)
70 144,000 84,000 44
400 134,000 66,000 45
600 132,000 63,000 42.5
800 131,500 61,000 45
1000 130,000 60,500 48
1200 119,000 60,000 34
1400 78,000 58,500 59
1600 40,000 39,000 117