Primitive Heat treat/temper for old saw blade

[jaegar]

Hi,
I'm making a knife from an old circular saw blade right now, and I'm afraid I've burnt the temper. What do I need to do to get it back, and how?
All I've got is the ability to make a fire, and Possibly a BBQ pit. don't think the BBQ pit would get hot enough though.
I don't know what steel this is.
I suppose I should forget about it and call it a prototype.
Thanks guys!
~Brian
P.S. I found a tutorial for a HT stove. Anybody else here that has made their own? have a few questions...

 

[Don Robinson]

Brian, if you have a way to heat the blade red hot, heat it uniformly until a magnet doesn't grab the steel, heat a little more, then quench it immediately tip down into transmission oil. Temper at around 400 degrees for at least an hour in your kitchen oven. test with a file.

There are lots more ways to do this, but this is about the simplest way to learn.

 

[Stacy E. Apelt - Bladesmith]

The steel may be L-6 or it could be a low carbon core on a blade with carbide teeth,too.That is the problem with "mystery" steel.To heat it the simplest way,use a propane Turbo torch.It will heat a blade to non-magnetic just fine.Follow Don's advice for quench and temper.If a file skates along the edge and won't bite after the quench,it is HC.If it won't harden,if is not usable for a knife.
Stacy