Nimocast PE10 is the investment-casting grade in Henry Wiggin & Co's "PE" Nimocast series, cross-referenced to BS HC202 and AFNOR NC20N13. Unlike the titanium/aluminum-hardened Nimocast 80, 90, and 713 grades, this record's confirmed composition - 20% chromium, 6% molybdenum, 2.5% tungsten, and very low carbon in a nickel matrix, with no titanium or aluminum present - points to a solid-solution and carbide-strengthened alloy rather than a gamma-prime, precipitation-hardened one. That places PE10 closer in strengthening mechanism to the corrosion- and oxidation-resistant Ni-Cr-Mo casting alloys used where hot corrosion resistance and toughness matter more than the very highest creep strength, rather than to turbine-blade-grade alloys like Nimocast 713.

The high chromium content provides strong oxidation and hot-corrosion resistance, while molybdenum and tungsten contribute solid-solution strengthening and pitting/crevice corrosion resistance. This combination is typical of cast nickel alloys specified for chemical-process equipment and moderate-temperature, corrosive service where a fully gamma-prime-hardened turbine alloy would be unnecessary or, in some environments, less corrosion-resistant.

Nimocast PE10 still machines like a difficult, cast, nickel-base alloy even without gamma-prime hardening - the combination of high chromium, molybdenum, and tungsten in solid solution keeps the matrix tough and work-hardening-prone, and low thermal conductivity concentrates cutting heat at the tool edge rather than letting it escape into the chip. The as-cast structure adds coarse grains and localized carbide segregation that are more abrasive to the cutting edge than a wrought bar of similar chemistry would be, and this alloy's chemical affinity for common tool materials makes galling and built-up edge a persistent risk.

Because it lacks the gamma-prime precipitates that make grades like Nimocast 713 or 90 retain so much strength at elevated temperature, PE10 is somewhat less brutal on tooling at a given hardness than the fully precipitation-hardened Nimocast grades, but it is still well outside plain-steel or stainless-steel territory. A steady, adequate chip load to avoid dwelling and work hardening, rigid setups, sharp positive-rake coated carbide grades suited to heat- and corrosion-resistant Ni-Cr-Mo alloys, and consistent coolant delivery remain the standard approach.