Inconel 925

Inconel 925


Principal Design Features

This is an age-hardenable alloy of nickel-chromium-iron. The additions of titanium and aluminum enable it to be age-hardened while molybdenum and copper contents enhance resistance to corrosive media. Designed primarily for applications in the production of gas.


It is used in the petroleum industry for applications such as gas well components, valves and tubing, as well as finding use in high-strength piping systems.

Heat Treatment

Solution anneal at 1900 F to 1800 F and air cool. Aging is done at 1350 F for 8 hours, furnace cool at 75 F per hour down to 1175 F and hold at 1175 F for at least 12 hours then air cool.


Forging should be done in the range of 2150 F to 1700 F.

Hot Working

Hot working may be done in the range of 1800 F down to 1600 F. Avoid working at temperatures above 1800 F to retain corrosion resistance.

Cold Working

Cold forming may be done using standard tooling although plain carbon tool steels are not recommended for forming as they tend to produce galling. Soft die materials (bronze, zinc alloys, etc.) minimize galling and produce good finishes, but die life is somewhat short. For long production runs the alloy tool steels ( D-2, D-3) and high-speed steels (T-1, M-2, M-10) give good results especially if hard chromium plated to reduce galling. Tooling should be such as to allow for liberal clearances and radii. Heavy duty lubricants should be used to minimize galling in all forming operations. Bending of sheet or plate through 180 degrees is generally limited to a bend radius of 1 T for material up to 1/8″ thick and 2 T for material thicker than 1/8″.


Anneal at 1850 F for at least 2 hours at temperature, air cool.


See “Heat Treat”.


May be hardened by heat treatment – see “Heat Treat” and also hardens due to cold working.

Physical Data

Density (lb / cu. in.) 0.294
Specific Gravity 8.14
Specific Heat (Btu/lb/Deg F – [32-212 Deg F]) 0.109
Electrical Resistivity (microhm-cm (at 68 Deg F)) 701
Melting Point (Deg F) 2450
Poissons Ratio 0.281
Mean Coeff Thermal Expansion 7.32
Magnetic Permeability 1.01
Modulus of Elasticity Tension 28.7

Mechanical Data

MSO currently has no data available for this grade.

Chemistry Data

Aluminum 0.15 – 0.5
Carbon 0.03 max
Chromium 19.5 – 23.5
Copper 1.5 – 3
Iron Balance
Manganese 1 max
Molybdenum 2.5 – 3.5
Nickel 38 – 46
Niobium 0.5 max
Silicon 0.5 max
Sulphur 0.03 max
Titanium 1.5 – 2.4