Inco 625 (UNS N06625) is a nickel-based superalloy that exhibits excellent oxidation and corrosion resistance. It also possesses high strength and fatigue properties in a wide range of temperatures, and can be easily welded and brazed. It is widely used for chemical, nuclear, and marine applications. Aerospace uses include airframe and jet engine components as well as space shuttle main engine parts. Other potential applications include heat exchanger and pressure vessel components for chemical processing.

With a high level of chromium and molybdenum, Inconel 625 exhibits excellent corrosion-fatigue strength. Additionally, IN 625 has moderately high tensile strength, creep resistance, and excellent resistance to chloride-ion stress corrosion cracking.

Inconel 625 Forgings

Our forgings inventory include Inconel 625 round bar, flat bar and rectangular bar, as well as forged rings, rolled rings, and discs.

We recommend forging with a maximum starting temperature of 2,150F and a minimum finishing temperature of 1,850F. Forging at temperatures below 1850F may cause hammer splits in the material. The alloy should be reduced in such a manner as to prevent formation of a duplex grain structure. Final maximum reductions of 15 to 20 percent are recommended for open die forging.

• Cr 20 – 23
• Mo 8 – 10
• Co 1 max
• Cb+Ta 3.15 – 4.15
• Al .4 max
• Ti .4 max
• C .1 max
• Fe 5 max
• Mn .5 max
• Si .5 max
• P .015 max
• S .015 max
• Ni Balance

• AMS 5599
• AMS 5666
• MS 5837
• ASME SB 443 Gr 1
• ASME SB 446 Gr 1
• ASTM B 443 Gr 1
• ASTM B 446 Gr 1
• EN 2.4856
• ISO 15156-3
• NACE MR0175-3
• UNS N06625
• Werkstoff 2.4856

• 625 Round Bar
• 625 Flat Bar
• 625 Rectangular Bar
• 625 Rolled Rings
• 625 Forged Rings
• 625 Disc

• 625 Sheet
• 625 Plate
• 625 Extrusion
• 625 Extrusion angles
• 625 Billet
• 625 Ingot
• 625 Machined Parts

Inconel 625 Additional Information:

Physical Properties

Hardness: Per AMS 5666 hardness is 287HB max in the anneal heat treated condition.
Density: 0.305 lbs per cubic inch.
Modulus of Elasticity: 29.8 MSI in annealed condition, 30.2 MSI in the solution heat treated condition.
Coefficient of Expansion: 7.6 x10-6 in/in/F RT-800F. 8.2 x10-6 in/in/F RT-1200F.

Machining

With the proper selection of tools and materials, Inconel 625 can be machined in either the annealed or solution heat-treated condition. Similar to other nickel-base superalloys, such as Inconel 718, the machining ability of Inconel 625 is inferior to that of most steels including stainless steels.

Welding

Inco 625 has excellent welding ability, particularly in conjunction with gas-tungsten-arc (GTA), plasma-arc, and electron-beam welding. Parent metal weld filler is typically used. Welding is generally carried out on annealed or solution heat treated material, and in many instances, appropriate post-weld heat treatment is employed to reduce residual weld shrinkage stresses. Strength and ductility are good in the as-welded condition, but a full post-weld solution anneal heat treatment (1800F) is often applied to obtain optimum properties (dimensional stability, fatigue life) in weldments.

Forming

Forming for IN 625 is good in the annealed or solution heat-treated condition.

Corrosion Resistance

Inco 625 possesses excellent corrosion and oxidation resistance. It also has good corrosion resistance to seawater and is therefore attractive for marine applications.

Heat Treatment