A2 and D2 are not "numbers and letters"

A2 and D2 are "letters and numbers"

Dan has already corrected this.


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Since Dan has indicate "numbers and letters", I can only come up with:

420 series
440A, 440B, 440C
154CM
12C27
50100-B
440V (aka S60V)
420V (aka S90V)
10V
3V


All are stainless except for 3V and 50100-B

50100-B is a tough steel with a toughness level similar to 1095, O1 or 52100.

Chromium content of 50100-B is only about .54% and as such 50100-B will be fairly prone to rust along with 1095 or O1.

50100-B (aka 0170-6) is also fairly similar to 52100 (like SR101), but with less chromium than 52100 and the B in 50100-B indicates that the steel
contains vanadium.
Many people believe Carbon V is 50100-B

3V is fairly different.


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