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welcome to DIY easy crafts calm how to a meal or soften and then reharden steel for knife making on the left is a piece of regretted round this is mild steel it's very easy to work you can file it cut it grind it you can even bend it not appropriate for knives because it just won't be hard enough to hold an edge in the middle we have a piece of high carbon steel this leaf spring of a car it's very hard very durable and very appropriate for a knife you can see that it will stand up to the rigors and a lifetime of outdoor use but it would be very difficult to cut or to grind into the shape of a blade on the other end of the spectrum you have tools steel tool steel like this file is very hard it would in fact hold an edge but it is not very too hard and it becomes brittle so what we want to do is take the spring steel that we want to use for our knife and anneal it or soften it so that we can work with it and then after we're completely done we want to reharden it again but reharden it brings the steel up to the tool steel state after it's reharden we then want to temper it so that it is not a brittle and that we can use it as a knife the first step is to bring the material up to critical temperature which is usually about cherry-red when it is no longer magnetic then let it cool slowly after it cools this is now equivalent to mild steel and we can grind it we can cut it we can file it and sand it to the desired shape and design of the night that we want to create this process takes a little bit of time but once you have the blade to the desired size and shape in order to reharden it we're going to take that blade and put it back into the furnace of course you want to make sure that everything is done all the holes are drilled and it's almost completely polished once it's back in the furnace again you want to bring it up to critical temperature wood state where it is no longer magnetic see our our magnet there on our threaded rod doesn't attach to them to the steel we're then going to take that cherry red hot steel out of the fire and instead of letting it cool slowly we want to quench it in oil it's this quick quenching that's going to reharden that spring steel but remember quick quenching is also going to result in this steel being brittle so the last step in the process after you take this knife blade blank out of the oil and let it cool we want to put it back into an oven in this case I'm just going to use my kitchen oven about 375 degrees for at least three hours this is the tempering process and again we want to let it cool slowly what I do is I put it in for three hours and then let it cool in the oven overnight this annealing and then hardening and then tempering process we'll give you a knife that is not only sharp but durable enough to last a lifetime please check us out on the web at DIY easy crafts com please check out our other how-to videos and if you like this video please subscribe to this YouTube channel