Alloy Haynes 25 (L605)

Chemical Analysis
C Carbon
0.05 – 0.15
Mn Manganese
1.00 – 2.00 max
Si Silicon
0.40 max
Cr Chromium
19.00 – 21.00
W Tungsten
14.00 – 16.00
S + P Sulfur + Phosphorus
0.030 max
Fe Iron
3.00 max
Ni Nickel
9.00 – 1.00
Co Cobalt

General characteristics of Alloy Haynes 25 (L605)

Haynes 25 (L-605) alloy is a solid-solution-strengthened superalloy with outstanding high-temperature strength, good oxidation resistance to 1800ºF (980ºC) and very good resistance to gaseous sulfidation.
The high strength properties of this alloy may be obtained through cold work. It remains nonmagnetic in the work hardened condition.
This alloy is generally melted using vacuum induction melting (VIM), followed by electroslag remelting (ESR). The finished mill product is supplied in the solution- annealed or cold-worked condition, depending on section size and application.


The alloy is used in established gas turbine engines for fabricated components, for balls and races in bearings and for various industrial applications.


The alloy should be forged between approximately 2150°F (1175°C) and 1850°F (1010°C.) Below this lower temperature the alloy is difficult to hot work. The cooling rate from forging is not critical, hence air cooling is generally employed.

Heat treatment

The alloy should be annealed at 2150/2250°F (1175/1230°C for at least 15 minutes, followed by water quench or air cool depending on section size. Typical annealed hardness is 20 HRC.


The alloy may be machined using conventional techniques, but cobalt grades of high-speed steel or carbide tools combined with rigid machine setups are recommended, as are positive feeds. The alloy’s high work-hardening rate and its strength make it moderate to difficult to machine.


The welding characteristics of this alloy are similar to those of austenitic stainless steels, and providing good practice is followed it may be welded by gas-tungsten-arc, gas-metal-arc and submerged-metal-arc.

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