INCONEL® Alloy 625 / 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.

Relevant Standards

Inconel 625 is covered by the following standards:

•         BS 3076 NA 21

•         ASTM B446

•         AMS 5666

Equivalent Materials

Inconel 625 is the tradename of Special Metals Group of Companies and equivalent to:

•         W.NR 2.4856

•         UNS N06625

•         AWS 012

   

ASTM Specifications

   

In what form is Inconel 625 available at SAGAR STEELS?

• 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

   

Applications

• Aircraft ducting systems
• Aerospace
• Jet engine exhaust systems
• Engine thrust-reverser systems
• Specialized seawater equipment
• Chemical process equipment
•  Marine
• Aerospace industries
•  Chemical processing
•  Nuclear reactors
•   Pollution control equipment

Fabrications

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.

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