Super Alloy Alloy 25 (L-605)

An improvement in mechanical properties, for applications where the operating temperature will be less than 1300 F, may be obtained by an aging heat treatment. This is done at 900 F after the solution annealing heat treatment has been accomplished.

In the case of significant work hardening because of severe cold working the alloy may be solution annealed at 2200 F followed by rapid air cooling.

Gas turbine high temperature components and industrial furnace (or similar) applications as muffles, liners and structural parts.

Conventional cold forming techniques may be applied.

Hot forging may be done in the temperature range 1850 to 2250 F. Reheat the billet or forging when the temperature drops to the point where additional forging may cause cracking. If cracks do appear they must be completely removed, usually by grinding, before heating and forging are resumed.

Conventional methods of forming by cold working, machining, welding, and forging may be used.

The alloy is basically hardened by cold working only. It may be given an aging heat treatment that will slightly improve hardness and strength.

This alloy is normally used in the annealed condition for optimum properties. Annealing is done at 2200 F followed by rapid cooling in air or water quenching. The alloy can also be given an aging heat treatment (after solution anneal) at 900 F to improve strength for applications below 1300 F.

The alloy is readily cold worked so that hot working is not normally required. However hot working can readily be done if required.

Can be machined by conventional methods and tooling with either high speed steel tools or carbide tools. However for milling, drilling or tapping the carbide tools are NOT recommended - high speed steel tools work best.

Form & Temp. Yield Str. Tensile Str. Elong. in 2% Condition Deg.F 0.2% offset Sheet-solution 70 65 ksi 135 ksi 60% annealed 1000 39 106 72 1400 35 84.5 28 1800 18.2 33.5 40 Bar-solution annealed 70 70 ksi 150 ksi 65% 1000 109 71 1400 70 35 1800 32.9 21 Creep 100 hour Bar-solution Stress Creep-%/hr. 100 hr.Rupture Str. annealed 1500 14 ksi .0041 22 ksi 1600 8 .0023 16.5 1700 6 .0026 12 1800 4 .0015 7.5

A cobalt based wrought alloy resistant to oxidation and carburization with good high temperature strength. The alloy is non-magnetic even in the work hardened condition.

Welded by means of shielded metal-arc, gas tungsten-arc, and gas metal-arc techniques. Submerged arc welding should be avoided. Weld area surfaces must be clean to bright metal and free from grease or hydrocarbon products. In sheet/strip product form the alloy can also be spot and/or seam-welded Filler metal electrodes should be of the same cobalt base alloy composition. Preheating and post-weld heat treatment are not normally required.