154CM, ATS-34

154CM (not to be confused with powder steel CPM-154, very identical - or the same as ATS34)
1.05% Carbon (C), 14% Chromium (Cr), 4% Molybdenum (Mo), 0.4% Manganese (Mn), 0.35% Silicon (Si). Modified 440C steel, only some of the chromium is replaced by molybdenum, which produces much harder carbides. The steel has much higher abrasive resistance. The steel is of excellent quality but requires more care, such as cleaning and regular oiling.

ATS-34 (very identical - not the same as 154CM)
1.05% Carbon (C), 14% Chromium (Cr), 4% Molybdenum (Mo),0.4% Manganese (Mn), 0.35% Silicon (Si). Modified 440C steel, only some of the chromium is replaced by molybdenum, which produces much harder carbides. The steel has much higher abrasive resistance. The steel is of excellent quality but requires more care, such as cleaning and regular oiling.

14-4CrMo (ATS34; 154CM)
(1.05% Carbon (C), 14% Chromium (Cr), 4% Molybdenum (Mo),0.5% Manganese (Mn), 0.3% Silicon (Si)) A stainless steel with extremely high wear resistance, higher than that of 440C or D2 steel (at the same hardness of approx. 61 HRc). One of the rarer steels. Compositionally very similar to ATS34 and 154CM steels. Made in USA / Latrobe Specialty steel company