Hitachi Hap40

Hitachi HAP40 steel is a high-speed powdered metallurgy (PM) tool steel known for its exceptional performance in kitchen knives. Its composition includes 1.27-1.37% Carbon (C), 3.70-4.70% Chromium (Cr), 4.60-5.40% Molybdenum (Mo), 5.60-6.50% Tungsten (W), 2.80-3.30% Vanadium (V), and 7.50-8.50% Cobalt (Co).

(Note: All knife steels contain carbon, which is primarily responsible for hardness and edge retention. However, higher carbon content alone can reduce toughness. A steel becomes 'stainless' when it has at least 13% chromium content.)

HAP40's high carbon content and the presence of cobalt contribute to its exceptional edge retention, surpassing even SG2 and Aogami Super. The high levels of tungsten and vanadium improve its wear resistance and toughness. Although HAP40 is slightly more challenging to sharpen compared to other steels, its outstanding edge-holding capabilities make it a popular choice for high-end kitchen knives.

Note: When selecting a knife steel for your Japanese kitchen knife, it's essential to understand that there are trade-offs involved. Improving one characteristic, such as edge retention, often means compromising on another, like toughness. There is no universally "best" steel; the choice depends entirely on your individual needs and preferences. Remember, steel is just one piece of the puzzle. Consider other aspects that matter to you such as the grind, aesthetics, and overall craftsmanship. While steel matters, it's not the only thing that makes a great knife.
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