CPM S35VN is a premium grade stainless steel that was developed by Crucible Industries, a leading manufacturer of specialty steels. This steel is known for its excellent balance of edge retention, toughness, and corrosion resistance, making it a popular choice for high-end knives and other cutting tools.

The chemical composition of CPM S35VN is as follows:

Carbon (C): 1.40%
Chromium (Cr): 14.00%
Vanadium (V): 3.00%
Molybdenum (Mo): 2.00%
Niobium (Nb): 0.50%
Tungsten (W): 0.50%
Iron (Fe): balance

S35VN is an improvement over the original S30V steel, which was also developed by Crucible Industries. S35VN contains more niobium, which helps increase its strength and resistance to wear and chipping. It also has a slightly higher chromium content than S30V, which increases its corrosion resistance.

CPM S35VN hardened knife steel typically has a hardness range of 58 to 61 on the Rockwell scale.  

Overall, CPM S35VN is a high-performance steel that is valued for its excellent balance of edge retention, toughness and corrosion resistance. It is a popular choice for knives, hunting and fishing accessories and other cutting tools where performance and reliability are important.