It is a Cr, Mo, V alloy, secondary hardenable cold work steel.
It has high toughness, dimensional stability and better weldability. It is rich in carbide.
It can harden better towards the core than 2379 cold work steel.
Nitriding and CVD is an excellent base material for PVD coatings. It is usually delivered in a hardened condition.
CP4M Next Generation Tool Steel