sawblade knives do you need to heat treat?

hey how's it going had a really good comment off john johnson on one of the videos he was asking about the hrc on a saw blade uh secondhand saw blade these are things i used to use and i still do occasionally like this great big one is which was off one of those big logging benches that's a big old saw blade i've used that for several blades made for a lot for those weed choppers and weed whackers you know they're easy they're easy to make a blade out of you can just grind the bevel on and stick a handle on them um but i've also used these for damascus there's a piece of bandsaw blade which will be kind of a 15 and 20 equivalent and that's a big industrial bandsaw bladed up [Music] and there is a there is an old circular saw blade that's really old there's no tungsten carbide teeth on that it's just literally steel teeth and there's a more modern version of a circular saw blade which is one of mine off my chop saw so that's probably probably about 10 years old that way so what i'm going to do because this is something i genuinely want to know and as far as i know i have not never hrc tested a blade as it stands now i think these are my thoughts on this i think that a saw blade i don't think these will be tempered to a high hardness i'm thinking they're going to be in the 40s to very low 50s hrc so maybe up to say 52 down to 40. i think somewhere around there because that's kind of sort of a springish temper on a steel and i don't think they would ever want these blades really hard i don't know this is genuinely the first time i've tested these obviously this test is really useful for you guys who just make knives out of saw blades and don't do any heat treating and just rely on these steel's properties to form a blade i've kind of always done a heat treat on these steels after i've made the knives but if you're not doing then this is going to give you a good idea of what the hardness of these steels are we've got three blades there we'll see what the numbers are cut a piece off the big one there because i don't want to hold that in the hrc tester we'll start off with that big old saw blade you're over on a little bit of an angle there but um i'll tell you exactly what the reading is from dead in front of it and to save you waiting for the preload to come down etc i'll bring it back with the reading here we go so we have 47 47.25 hrc on that one here's the old just carbon steel saw blade i've cleaned all these blades down by the way there's no scale or rust on them or anything that to me seems maybe a little bit harder that one yeah that one is at 52.5 here's the more modern type blade probably made in china although you never know yeah that is i think softer than the other than both the other two that one is at 41 42 43 44 hrc finally let's do this bandsaw blade and the is we are 40 just shy of 46 on the bandsaw blade so guys there isn't a massive amount of difference in these steels really some are a little bit softer than others and but to my mind that they're just not hard enough for a knife edge they need to be round here in the 59 range you're way down on hardness here in the 40s it's just not good enough for a knife steel it is in the spring steel range that in in the 40s to 50s so you want to be through the 50s and you want to be towards 60 to have an a a good edge for a knife cutting edge so that's it guys hope help somebody out and thanks to my patrons and catch you in the next one you

Channel: Loz Harrop

Views: 10,577

Keywords: sawblade knife

Id: OpXSCtuqrOM

Length: 5min 2sec (302 seconds)

Published: Wed Feb 09 2022