Allcorr is the trade name of a nickel-chromium-molybdenum-tungsten corrosion-resistant alloy, UNS N06110, originally developed by ATI Allvac. It is a single-phase, solid-solution, high-nickel alloy engineered for particularly aggressive corrosive service, and its chromium content is notably higher than the common "C-type" Hastelloy family, giving it greater resistance to oxidizing environments than those alloys typically provide.

Typical applications include equipment for deep sour gas wells, flue gas desulfurization systems, chemical and hydrocarbon processing plant, and pulp and paper production - all environments combining aggressive chemical attack with the need for high strength and toughness. The alloy offers strong resistance to general corrosion, pitting, crevice corrosion, intergranular attack, and stress corrosion cracking, along with good ductility and weldability.

Because it is a solid-solution-strengthened alloy rather than a precipitation-hardened one, Allcorr does not carry the strengthening gamma-prime phases found in age-hardenable superalloys, but its high combined chromium-molybdenum-tungsten content still produces a tough, work-hardening, low-thermal-conductivity material that behaves like other high-alloy nickel superalloys at the cutting edge.

Allcorr shares the core machining challenges common to high-alloy, solid-solution nickel superalloys. Its combined 31% chromium and 10% molybdenum content lowers thermal conductivity substantially compared with steel, so heat generated in the cut concentrates at the tool-chip interface instead of dissipating into the chip. This drives accelerated crater wear and edge deformation if speeds are pushed too high.

Like other single-phase nickel alloys, Allcorr work-hardens readily under cutting forces. Any hesitation, rubbing, or light, inconsistent feed leaves a hardened surface layer on the next pass that is considerably tougher to cut than the parent material, so maintaining a steady, adequate chip load matters more than in most steels. The alloy also retains a useful fraction of its strength at elevated temperature, so the usual softening effect that eases machining of carbon steel at higher speeds is largely absent here - tool edges stay under heavy mechanical load even as cutting temperatures rise.

Nickel-rich alloys like Allcorr are also prone to galling and built-up edge from their chemical affinity for common tool materials, which can weld chip material to the cutting edge and tear the finished surface. Rigid setups, sharp and properly honed edges, coated carbide grades suited to superalloys, and consistent, generous coolant delivery are the standard countermeasures.