CPM-154/S90V

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CPM-154 is Crucible's powder-manufactured version of their standard 154CM. It consists of:

Carbon Chromium Cobalt Copper Manganese Molybdenium Nickel Nitrogen Phosphorus Silicon Sulfur Tungsten Vanadium
1.05 14.00 / / / 4.00 / / / / / / /

CPM-S90V consists of:

Carbon Chromium Cobalt Copper Manganese Molybdenium Nickel Nitrogen Phosphorus Silicon Sulfur Tungsten Vanadium
2.3 14.00 / / / 1.00 / / / / / / 9.00

From the steel description:

Spyderco is the first production company to use this unique and very exotic, composite blade steel from Crucible Industries of New York. The manufacturing process is in itself unique. It begins with a 1-inch thick plate of CPM S90V. The plate is placed in a specially engineered and built steel can and the voided areas on either side of the plate are filled with CPM 154 powder. The can is positioned on a vibratory table to ensure consistent density in the packing of the powder and then it is welded shut and subjected to a vacuum to evacuate any oxygen. The can then enters an autoclave under extreme heat and pressure where the powder forge-welds with the plate. Afterwards, the can is machined off; the remaining slab is cogged-down in a roller into flattened sheets suitable for making knife blades. Where many layered steels are produced by heating plates and then sandwiching the steels together, this process uses specialized equipment and welding techniques commonly featured in the manufacture of aircraft parts where steels are held to rigorous specifications to avoid structural failure.