this can be found in any "how to make a knife book" but here is a genral
over view.
W= water hardening
S= Shock resiisting
O= Oil hardening
A= air hardening
D= die steel high chromium (very hard)
H= hot working
T= tungsen base
M= molybdenum base
10XX- carbon steels 10 =low 99= high
Dan Scheid