Micro-Melt PD1

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Micro-Melt PD#1 consists of:

Carbon Chromium Cobalt Niobium Copper Manganese Molybdenium Nickel Nitrogen Phosphorus Silicon Sulfur Tungsten Vanadium
1.10 7.75 / / / 0.25 1.60 / / / 1.20 / 1.10 2.35

From Spyderco's website:

Micro-Melt PD#1 is an air-hardening cold-work die steel. PD#1's unique alloy composition gives it wear resistance significantly superior to conventional steels like D2, while still maintaining excellent toughness. Thanks to Carpenter's advanced Micro-Melt powder metallurgy process, PD#1 possesses an extremely fine microstructure and uniform carbide distribution, as well as the enhanced compressive strength necessary for the demands of tooling applications. Collectively, these qualities give it a unique combination of wear resistance and toughness that make it ideal for use as a blade steel.[1]

References

  1. [1] Spyderco.com product page: Mule Team™ 27 Micro-Melt PD#1