Grinding & Sharpening ApexUltra
Between worlds: fresh ceramics make it slightly-stubborn 52100, worn ones make it punishment. Hog annealed; at 64-67 HRC run feather passes with metronome dunks - a blued edge costs temper, re-treat and boutique bar price. Bench: good waterstones work, diamonds make it routine; grind the thin 10-14 dps geometry the steel was designed to hold.
ApexUltra sits deliberately between worlds, and the shop experience matches: harder work than the classic carbon steels it forges like, far friendlier than the powder stainless class it cuts like. The tungsten that buys its wear resistance collects a modest tax at every abrasive step — pay it with sharp consumables and cool habits.
On the 2×72
Fresh ceramic belts make annealed ApexUltra feel like slightly stubborn 52100; worn belts make it feel like punishment — the carbides decide which shop you run. Hog annealed as always. Post-heat-treat is the real discipline: at 64-67 HRC, edges are thin, hard and expensive — sharp 120-220 ceramics, feather pressure, dunk cadence like a metronome. A blued ApexUltra edge hurts three ways: the temper, the re-treat, and the bar price. Finishing: it hand-sands well for a carbide steel and takes a handsome satin; hamon is not its game (that is W2 and 26C3 territory) but a clean etch shows a quiet quench line on differentially treated blades.
At the Bench
Good stones work; diamonds work better. The tungsten/vanadium carbide load is low enough that quality waterstones cut it honestly — slower than 26C3, faster than any PM stainless — and a diamond progression simply makes the 65-HRC edge routine. Finish on a strop with fine compound: at this hardness the apex stabilizes beautifully and push-cut keenness holds. Angles: the whole point of the steel is running 10-14 dps kitchen edges at hardness that keeps them stable — grind the thin geometry it was engineered for, per the kitchen angle guide.
The Quote
Budget roughly 1.5x classic-carbon shop time and premium belt consumption — then remember the finished blade’s spec sheet writes the listing. ApexUltra work is flagship work; the shop tax is part of the story the customer is buying.
Common Mistakes
Worn belts on a tungsten steel. Standard-carbon heat habits on 66 HRC sections. Building thick conservative edges that waste the entire hardness-toughness achievement. Forgetting the shop tax when quoting.
Safety
Ultra-hard thin edges chip under aggressive catches during grinding – eye protection and light entries at the plunge. Cool discipline absolute: this is the most expensive temper in the carbon rack to burn.