You can get 5160 and 1095 at a spring shop.Look in the phone book under "springs".It can be ordered from any knife supply(K& G,Koval,TKS,Jantz,etc.),Admiral steel,Crucible steel, and a dozen other machine shop supply places.You are going to need to anneal the springs before you can do much with them.Yes,you can use a pottery kiln to HT steel,but it is a bit of a pain.It is not all that easy to take out a blade from a kiln.A pottery shop would not be happy with you if you started quenching blades in their shop.You can use a propane torch with MAPP gas, to HT small blades, on a budget.
Stacy
PS,I tried to send you an email and you are blocked.Send me a private message,I can hook you up with some steel.