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CTS-20CP is a steel made by Carpenter Steel and consists of:

Carbon Chromium Cobalt Copper Manganese Molybdenium Nickel Nitrogen Phosphorus Silicon Sulfur Tungsten Vanadium
2.20 13.00 / / 0.50 1.30 / / / 0.90 / / 9.30

Some information from the Spyderco website:

Carpenter specifically developed CTS-20CP as a blade tool steel. Its high vanadium content results in elevated corrosion-resistance and is manufactured with their proprietary Micro-Melt powdered steel technique. The Micro-Melt process enables the finished blade to be machined to an ultra-fine edge with superior surface finish.

CTS-20CP is Carpenter's version of Crucible's ever popular CPM-S90V and has been shown to offer almost identical performance in user testing.