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

Carbon Chromium Cobalt Copper Manganese Molybdenium Nickel Nitrogen Phosphorus Silicon Sulfur Tungsten Vanadium
1.60 16.00 / / 0.50 0.80 0.35 / / 0.40 / / 0.45

Some information from Sal posted on the Spyderco forum:

We are proud to have been able to be the first to introduce Carpenter's CTS-XHP in a production knife. A stainless D2 alloy that has shown to be exceptional in knife blade qualities. you will surely see more Spyderco models using the excellent steel.