Pertain to ht with cryo quenched for high alloy steels (starting out with low as-quenched RA% < 2%) *1* Aust temperature above 1050c = head toward grain coarsening (see chart below). *2* HTT (high temperature temper > 500c): Cr & Mo precip (mostly Cr) = loss of corrosion. Precipt carbide coarsening/enlarging = some level of lowering elasticity and apex keenness. *3* LTT (low temp temper < 350c): cementite precip is mostly diffusionless (thanks to alloy for blocking C movement) - therefore cementite remain at nano scale non-crack-initiator/nucleator particle. Jury/camp for edge tools LTT vs HTT is a continuing discussion - perhaps so because context of usage could tilt between pro/con. Does this tradeoff worth it - HTT to get rid of 2-% RA in trade for more/en-larged CrxC and gave up some corrosion resistance? It's sure relevant to edge stability and endurance (of course depend on intended uses). Also quite obvious from my posts on BF - my blades are mostly LTT (and occasionally untempered). YMMV http://i.imgur.com/VR4Bhzg.jpg http://i.imgur.com/XMBFzZt.png IF edge tools are for cutting & chopping - IMHO Zt S35VN knives (I presumptuously assess based on videos and other people anecdotal opinion/data) are sub par performance on intended uses. S35VN definitely a poor choice for prying tools.