High Hardness=Good Carbon Content?

[CKE2]

I had a saw-z-all blade(lennox) piece and decided to try and heat treat it for sh@#s and giggles. The piece is 1/16 thick 4 inches long. Well, I got it to a non magnetic state(oxy/acet torch) then quenched in hydraulic oil. Tested on the Rc tester and got 64. Put the piece in a vise and tried to bend it. Almost 45 degrees before she snapped. Tempered the larger remaing piece in my kitchen oven(the wife was not too impressed) at 425 for 1 hr and it is now 59 on the Rc. Put it back in the vise and it bent 75 degrees and sprung back( not long enough to get it to a full 90 degrees) to a slight bend.
Here is the question, I have no idea of the make up of the lennox blade. Because I got such a high Rc reading I "assume there is sufficient carbon content to make a blade out of these saw-z-all blades? I just want to make a little warncliffe utility knife with oak handles. Blade 2 to 2-1/2 inches in length. I know it will rust but is it worth my time to play around with it? Before I start using my 440C stock I just want to practice with something that at least will hold an edge. Your thoughts??? Thanks and Take Care!!!

Craig

 

[B . Buxton]

I made a couple filet knives useing the longer sawzall blades years ago. I still use them (filet knives) today, I believe the steel is equivalent to L-6 if its not L-6, I used to know but its been a long time.

so yes in my opinion there well worth your time to fool with.

have fun

Bill

 

[CKE2]

Thanks Bill!
What does the Bi- Metal mean in sawzall, hacksaw blades?
Should I leave them at 59 Rc or should I try to go softer...57 ish? Edge retention/ sharpness is the main purpose so flex is not a big concern with the shortness of the blade.

 

[Crayola]

My thoughts?

Keep playing! If you got that blade to 59 after tempering, it will be a great, serviceable piece! Especially after your bending test. Keep up the fun work!

 

[mete]

Bi-metal means two metals. The blade has a steel for the spine or body of the blade which is softer but tougher and another steel ,harder and more wear resistant, for the thin strip that the teeth are made from. The problem of making a knife is that in shaping you may grind away the harder steel.

 

[CKE2]

In the test piece I ground the "teeth" strip off. All of my testing was done on the spine/body of the blade??? Still got to 59 Rc. after temper.
Sounds like I am in for some fun...maybe tomorrow. Thanks again everyone, with all the questions I have been asking lately I should have a truck load of knives made already. This will be my first. Take Care and enjoy the rest of the weekend...well whats left.

Craig