3J40 is a precipitation-strengthened nickel-based alloy. It has good plasticity in the solid solution state and is easy to process. It obtains high mechanical properties and elastic properties after large strain rate cold working and aging treatment. The alloy can also be strengthened by aging after solid solution. 3J40 is a Ni-Cr-Al alloy with a chromium content of up to 40% and excellent corrosion resistance. 3J40 has the characteristics of high hardness, strength, elastic limit, energy storage ratio, fatigue strength, small elastic hysteresis and aftereffect, non-magnetic, good wear resistance, shock resistance and impact resistance, excellent corrosion resistance, etc. The alloy has excellent oxidation resistance. It has high corrosion resistance to humid heat, smoke environment, acid, alkali and other media. Mainly used for bearings and pivot points in aviation, navigation, anti-aircraft artillery and other fields.