Very useful video, thanks. I've a load of these blades (perks of being the guy who changed them) and have made bits and bobs from time to time. Frankly it never occurred to me that they'd be anywhere near hard enough, even if they hadn't annealed from heating by friction, so I've just done a rough and ready heat treat tempering them to light straw as best I can, with acceptable results. Sounds like they have the potential to be more than acceptable, though, in the hands of someone better equipped and more competent.
Could you heat treat those same samples and show us how much harder you can get them, and how you heat treated them? Thanks! I really enjoy your straight forward videos!
Hi Dwayne, If I was to heat treat the same steels Im pretty sure they would almost all achieve 63 HRC as a minimum, they would have been heat treated when they were made to give the results when I tested them. I meant to re'heat treat the blades some time ago to find out so maybe I will in the near future. Cheers
Just used bandsaw blade that I quench myself they cut steel in bandsaw every day I think they must be hard but probably quench only at blade tips I'm crying after you compare steel
The body of the blades are left in the annealed state while the edges are hardened. Try testing the cutting edges in your tester. Make a rough test blade from the largest circ blade and see how your heat treat works out. A 1095 profile would be a decent guess? 👍 😃
Wonder how much the constant heating then cooling affects the hardness. I worked in construction for over 20 years and have seen blades tossed in the trash because no one sharpens them anymore. When I was a kid I remember watching my grandpa sitting in front of his work bench sharpening his handsaw, and latter his circular saw blades
Top video matey just goes to show a proper heat treatment specific to the type of steel your using js essential...and not to rely on what is pretty much a guess 🤝👍
I’ve used 58-62 RC in the field, a lot. Really not practical to resharpen in the field, and you will need to resharpen, often. Don’t let harder RC steel get dull. For me, 52-54 RC is ideal for hard use, and you will need to resharpen often. But you can easily keep a usable edge like a butcher does, as the day goes on. Same is true for hatchets, axes, machetes…
As always great video Loz. Since you are in the subject of saw blades Rockwell hardness test, would you go two steps further: Heat and quench those blades and see what RC values they would have before tempering. And step two, temper to what you normally do for knife blades, and see if they can be tempered to 59 to 60 HRC. Thank you.
I've done some testing with tungsten teeth saw body I've achieved 64 HRC after quenching before tempering. After tempering IT had about 61, also IT was suprisingly tough
Could you harden and anele them, and se what hardness they could achieve? I am especially curious about the steel quality on the modern blade with carbide..
Tried to brake a small piece of saw disc with a hammer and it just bend.The file tels me there is some hardness in it though propably around 40hrc as you showed.Quenched the piece in canolla oil and broke like a glass.Normaly it will make a good knife am i wrong?What is the tempering temperature for about 59hrc on these disc blades?
Im afraid I cant give you an acccurate temp mate without hrc testing the steel first but somewhere in the 230C - 250 C range will get you to 59. Cheers
Very useful video, thanks. I've a load of these blades (perks of being the guy who changed them) and have made bits and bobs from time to time. Frankly it never occurred to me that they'd be anywhere near hard enough, even if they hadn't annealed from heating by friction, so I've just done a rough and ready heat treat tempering them to light straw as best I can, with acceptable results. Sounds like they have the potential to be more than acceptable, though, in the hands of someone better equipped and more competent.
Yea same here mate, always regarded them as unhardened, mot likely 7 series steel most of them so they can be made alot harder. cheers
Could you heat treat those same samples and show us how much harder you can get them, and how you heat treated them? Thanks! I really enjoy your straight forward videos!
yes I will be doing that shortly mate cheers
@@LozHarrop hi, it's only been a few months, but did you get round to doing more testing yet?
Thanks for taking the time!!!
No worries!
I’d love to see the same test repeated after heat treating. How much does the HRC increase after you quench and temper the same steel?
Best,
Dwayne
Hi Dwayne, If I was to heat treat the same steels Im pretty sure they would almost all achieve 63 HRC as a minimum, they would have been heat treated when they were made to give the results when I tested them. I meant to re'heat treat the blades some time ago to find out so maybe I will in the near future. Cheers
Good information to know, thanks for doing and sharing. How about an ice skate blade? Hedge clippers and scissors?
probably all be in the same range as the saws mate. cheers
Just used bandsaw blade that I quench myself they cut steel in bandsaw every day I think they must be hard but probably quench only at blade tips
I'm crying after you compare steel
The body of the blades are left in the annealed state while the edges are hardened. Try testing the cutting edges in your tester. Make a rough test blade from the largest circ blade and see how your heat treat works out. A 1095 profile would be a decent guess? 👍 😃
I can tell what you said is true because cutting through table saw blades becomes more difficult towards the edges.
Wonder how much the constant heating then cooling affects the hardness. I worked in construction for over 20 years and have seen blades tossed in the trash because no one sharpens them anymore. When I was a kid I remember watching my grandpa sitting in front of his work bench sharpening his handsaw, and latter his circular saw blades
yea charlie used to sharpen my hand saws as an apprentice too.
Top video matey just goes to show a proper heat treatment specific to the type of steel your using js essential...and not to rely on what is pretty much a guess 🤝👍
cheers Bud
Thanks for sharing!
Thanks for watching sam!
I’ve used 58-62 RC in the field, a lot. Really not practical to resharpen in the field, and you will need to resharpen, often. Don’t let harder RC steel get dull.
For me, 52-54 RC is ideal for hard use, and you will need to resharpen often. But you can easily keep a usable edge like a butcher does, as the day goes on.
Same is true for hatchets, axes, machetes…
As always great video Loz.
Since you are in the subject of saw blades Rockwell hardness test, would you go two steps further:
Heat and quench those blades and see what RC values they would have before tempering.
And step two, temper to what you normally do for knife blades, and see if they can be tempered to 59 to 60 HRC.
Thank you.
Yes will put some pieces in on my next heat treating session. Cheers
@@LozHarrop Thank you Loz.
I've done some testing with tungsten teeth saw body I've achieved 64 HRC after quenching before tempering. After tempering IT had about 61, also IT was suprisingly tough
Could you harden and anele them, and se what hardness they could achieve? I am especially curious about the steel quality on the modern blade with carbide..
yes ill do that cheers
@@LozHarrop perfect!! Looking forward to seeing the results 😁
so, seeing an attempt to harden then higher would be interesting.
Just what I was was looking for too!
Thank you
Glad I could help!
Tried to brake a small piece of saw disc with a hammer and it just bend.The file tels me there is some hardness in it though propably around 40hrc as you showed.Quenched the piece in canolla oil and broke like a glass.Normaly it will make a good knife am i wrong?What is the tempering temperature for about 59hrc on these disc blades?
Im afraid I cant give you an acccurate temp mate without hrc testing the steel first but somewhere in the 230C - 250 C range will get you to 59. Cheers
Did you try to heat treat the big saw blade in a forge to see if it would get any harder 🤔 thanks
JUST WHAT I WAS LOOKING FOR.
Glad it helped mate
Thanks, that was helpful
Thank you man.
Glad it helped mate 👍
Can you reharden the blades and temper to a lower temp after forging to get those steels harder?
Ys you can Frank they will harden to around 63 hrc at least and can be tempered back to around 59 or whatever you want
Cheers Loz, much appreciated. Nice topic 👍
Glad you enjoyed it
Realy interesting mate thanks for the info.
No problem 👍
Very interesting, thanks!
Glad you liked it!
Yeah i use those steels but i always heat treat to make em harder good vid my freind!
Thanks 👍
Thank you.
Welcome!
Ｐｒⓞм???