"500" most closely matches Udimet 500, a nickel-chromium-cobalt superalloy (UNS N07500, DIN/WNr 2.4983) developed for gas turbine hot-section hardware. It sits alongside the cast cobalt superalloys in this reference library as a specialty high-temperature grade that evidently did not carry a keyword the original cataloging process recognized - Udimet 500 is nickel-base rather than cobalt-base, but shares the same high-temperature service niche (turbine blading, bolting, and similar hot-section components) as its cobalt-base neighbors.

Udimet 500 is strengthened by gamma-prime precipitation from its aluminum and titanium content, combined with solid-solution strengthening from chromium, cobalt, and molybdenum. It offers good creep and stress-rupture strength up to roughly 760°-870°C, along with good oxidation and hot-corrosion resistance, and has a long service history in aircraft and industrial gas turbine blading, discs, and fasteners.

Udimet 500 machines like the demanding nickel superalloy it is: high strength, gumminess, and rapid work hardening are the defining challenges. Because the alloy is gamma-prime strengthened rather than carbide-strengthened, it does not carry the same abrasive hard-phase content as a cast cobalt superalloy, but its combination of strength and toughness still drives high cutting forces and heavy tool wear compared to ordinary alloy steels.

Low thermal conductivity concentrates heat at the tool-chip interface rather than carrying it away in the chip, accelerating crater wear. Work hardening under light, interrupted, or rubbing cuts is a persistent risk, so a steady, adequate chip load that keeps the edge engaged in fresh material is essential. Chatter and edge notching are common failure modes if speeds are pushed too aggressively or the setup lacks rigidity.

Rigid, heavy-duty tooling and machine setups, sharp positive-rake ground carbide inserts, and generous coolant (water-based for milling, turning, and grinding; heavier-duty lubricants for boring, drilling, broaching, and tapping) are the standard countermeasures for this alloy family.