CTS BD-1 is a steel made by Carpenter that has become more common in recent years. It is used for knives in the upper mid-range by manufacturers like Cold Steel and, in part, Spyderco. It has a hardness of 58 to 60 HRC.

Origin: USA
Carbon (%): 0,9
Chrome (%): 15,5
Molybdenum (%): 0,3
Vanadium (%): 0,1
Manganese (%): 0,6
Silicon (%): 0,37