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Super Alloy Inconel 625

Related Metals: Nicrofer 6020 hMo(tm)VLX625(tm)Udimet 625(tm)Nickelvac 625(tm)HAYNES(r) 625 alloyChronin 625(tm)Altemp 625(tm)Pyromet Alloy 625(tm)Custom Age 625 +(tm)HAYNES(r) 625 alloy(tm)Nicrofer 6020(tm)Pyromet 625(tm)

Specifications: AMS 5581AMS 5599AMS 5666AMS 5837AMS 5879ASTM B366ASTM B443ASTM B444ASTM B446ASTM B704ASTM B705DIN 2.4856GE B50TF133MIL E-21562 (RN625)UNS N06625

Chemistry Data

Aluminum 0.4 max

Carbon 0.1 max

Chromium 20 - 23

Cobalt 1 max

Iron 5 max

Manganese 0.5 max

Molybdenum 8 - 10

Nickel Balance

Niobium 3.15 - 4.15

Phosphorus 0.015 max

Silicon 0.5 max

Sulphur 0.015 max

Titanium 0.4 max

General Information

Principal Design Features

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This nickel-chromium-molybdenum wrought alloy is an excellent general purpose material forelevated temperature use in high strength, oxidation problem applications. It also hasexcellent corrosion resistance to many acids and resists intergranular attack and stress-corrosion cracking.

Applications

The alloy finds use in high temperature applications such as heat exchangers and gas turbinecomponents. Because of its good corrosion resistance it is also used in wet scrubbers andsome acid process equipment.

Machinability

May be machined by conventional means. However the alloy tends to work harden ahead ofcutting and rigid tooling is essential to avoid chatter and work hardening in front of the tooledge.

Forming

This alloy can be cold formed by conventional means and tooling. The alloy does work hardenduring cold working with an attendant increase in strength. This increase in strength may beof value for moderate temperature applications and, in these instances, the formed parts canbe left in the cold work hardened condition.

Welding

Welding is readily accomplished using matching alloy filler metal for the conventional weldingtechniques.

Heat Treatment

The alloy is furnished in the solution annealed condition. This is done at 2150 F for sufficienttime dependent upon section thickness. Following the anneal the alloy may be air cooled.

ForgingHot forging can be done by heating the billet to 2100 - 2150 F, but not over 2150. Heavyforging may then be done down to a billet temperature of 1850 F and light forging down to1700 F. Final reductions of 15 to 20% minimum are recommended to maintain proper grainstructure.

Hot Working

Hot forming may be done by heating the alloy to 2150 F. Because this alloy is engineered forgood strength at high temperatures it will resist hot deformation and therefore requirespowerful equipment to perform hot forming.

Cold Working

The alloy can be cold formed by conventional methods and tooling. See also the commentsunder "Forming" regarding work hardening.

Annealing

Because the alloy work hardens during hot or cold forming it may be necessary to anneal suchparts in order to complete forming operations. Annealing is done at 1800 to 2000 F and aircooled. Stress relief of cold worked parts may be accomplished at 1100 to 1400 F.

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Aging

The alloy derives its strength from its basic chemical composition. Thus aging or precipitationhardening is not applicable as a heat treatment.

Tempering

Not applicable.

Hardening

Cold working does harden the alloy and improve strength, dependent upon the amount ofcold working. The alloy can be used in this higher strength cold worked condition or may beannealed at 2150 F to restore original mechanical properties.

Physical Data

Density (lb / cu. in.) 0.305

Specific Heat(Btu/lb/Deg F - [32-212Deg F])

0.107

Melting Point (Deg F) 2425

Poissons Ratio 0.312

Thermal Conductivity 74

Mean Coeff ThermalExpansion

7.3

Modulus of ElasticityTension

29.2

Reduction of Area 70

Mechanical Data

MSO currently has no data available for this grade.