a word for oven tempering
Posted 18 January 2010 - 06:37 PM
I'm sure you pro guys might have a word to stick in too, so if this is in eror, or another step would increase function, post corrections.
I know though, when I was starting out, I was afraid to work with carbon just because I had no idea how to do all of the steps right. However, like I said, these tools that I am making now only take a couple hours and last quite well. I wish I had known how to do this when I was first starting, because it would have made a lot more stuff possible and it would have made a lot of stuff easier!
Posted 19 January 2010 - 09:32 AM
Posted 20 January 2010 - 12:54 AM
Posted 20 January 2010 - 12:15 PM
eg: I want to make a knifeblade (intended use, crossectional shape) from leaf spring (material); the personal preference can be worked out when you try a method and then decide how to alter it to suit yourself.
Posted 22 January 2010 - 09:02 AM
Posted 22 January 2010 - 11:02 AM
If you quench in vegetable oil and then want to draw temper in the kitchen oven you can generally get away with it!
(married 25 years so far...)
Posted 22 January 2010 - 12:19 PM
Posted 26 January 2010 - 12:29 AM
Normalizing, i.e., heatng to critical and holding for a few minute, then letting air cool, helps refine the grain (make the grain smaller) in the steel. The finer the grain the better potential for good results with hardening.
I've also heard/read in several forums and other articles, as well as from several bladesmiths that 400 degree is the best temperature for tempering leaf spring steel (5160).
In addition to knife blades, I've made a couple of tools. Here is a photo of a couple of woodworking chisels I made from leaf springs. I used one of the chisels to shape the handles (hickory). After an hour or so the chisel showed no signs of wear and was still as sharp as when I started - and that hickory is HARD.
Posted 26 January 2010 - 11:31 AM
Posted 26 January 2010 - 06:02 PM
I would have said 400 degrees was too high but I can also cut leaf spring with a band saw! LOL Maybe I have some softer spring material! I was told no higher than 350 myself and that was for file material!
When I do the motor oil quench I take the excess oil off with a rag and then a wire wheel. I was told not to use vegitable oil! (Then again I was told not to mess with carbon steel much too! LOL) I like the idea of mixing in crisco (that would be about the only thing that junk could be good for.) I don't cart my oil around but it would be nice to be able to! I'll have to try that! Thanks for the advice!
Once again this thread is simply to encourage younger/newer blacksmiths not to be afraid of working carbon steel and playing with tempering. I was afraid, and it cost me for four years in lack of proper tools! I simply don't want the next smith to be afraid to work carbon steel. In my opinion, by encouraging a newer smith to work the steel and create hardened tools, you help the smith gain confidence. If I go out to the forge with confidence that I can produce something nice; I enjoy my time more, and usually can turn out something nice! If I go out with more of an attitude of dispair or the standard "I'll never be THAT good," then usually I do a pretty poor job and am iritated the whole time. Helping a newer smith produce a functional (start with functional then go to professional) tool out of the "mystical" carbon steel, will produce a high level of confidence and help sustain interest in the craft.
Posted 26 January 2010 - 06:44 PM
I agree, "best" for what? 350 might be great for a knife depending on it's use. I draw most low-alloy hot work tools at 700. Even higher for a spring. bout 900 for rigging gear, shackles and such. Hardness is not everything either, carbide forming like you get with carbon steel over about .80 C adds to wear resistance to an incredible degree.
But, in the end, 1600, oil quench, 400 draw is a good starting point for most "mystery metals". And, yes, springs are mystery metal no matter how many people "know" it's 5160.
but then there are others who, with the help of their art and their intelligence,
transform a yellow spot into the sun.” ~ Pablo Picasso ~
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