Circular saw for wood steel identification

N

Natlek

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Jun 9, 2015
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Just curious . I got from friend this new but little rusty saw for wood . 20 inch Dia. and 2.8 mm. thickness . In a hurry I HT two pieces / magnet , torch and tube inside my improvised oven / no soak just after magnet stop catch . Spark is almost red and small .I gave this test pieces to the same friend who gave me this saw to measure HRC , he work in a Hi tech company and they have Rockwell tester . here is the result .........I did some research but nothing concrete , did not find which steel can be ? What do you guys think ? Which steel can be this according result I get ? I already cut two blank ......... :)

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Carbon steel
 
But all joking aside, are the teath brazed on or are the teath the same material as the body. If it's the same steel as the body then your most likely looking at a simple carbon steel, have no idea which one. If it has bimetall or carbide teath then the body can be allmost anything as long as it's tough.
 
Yes, carbon steel but any chance to guess which one can be ? The teath are the same material as the body , yes .
 
It really was 68RC with a water quench? I would say 1095 by that high of a RC but your not going to get that hard with motor oil and 1095. Even 15n20 won't get that hard with a water quench.
 
Yes it s really 68.1 Hrc and that is what puzzles me . Is it normal Hardness for every carbon steel ?
 
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JTknives said:
It really was 68RC with a water quench? I would say 1095 by that high of a RC but your not going to get that hard with motor oil and 1095. Even 15n20 won't get that hard with a water quench.
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I made a few knife from 15n20 , very good and tough steel . Steel / 15n20 / that I use is from big industrial circular saws for granite .. ...
 
Probably 8670. I've made Many knives from old circle saw mill blades and they make fine knives.

I would question the high Rc hardness though. I will test a couple piece I have here tomorrow, if I remember.
 
thats what i was thinking, the RC looks a bit high. even don's super W2 hits what 67rc if everything goes right.
 
Don Hanson III said:
Probably 8670. I've made Many knives from old circle saw mill blades and they make fine knives.

I would question the high Rc hardness though. I will test a couple piece I have here tomorrow, if I remember.
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100% true . The company is very serious and everyone of them is mechanical engineers, they know what they're doing They called me on the phone when they measured hardness , they asked me if I had not mistakenly sand a piece of HSS steel :) I'll call them tomorrow, the pieces of saw are still there and I'll ask them to repeat the measurement . But when I broke a piece to see inside structure I did it with a hand-small pliers .Just a gentle impact and steel break . It's amazing how easy it break . I do that with many different steel but this was like glass ..........
 
Did you temper before breaking ?? If it is a saw it must be tougher than 'easy to break ' .
 
No way I can break piece from saw before my HT . Saw is 46 Hrc , I try .........bend to half and then break but need good hammer to do that .
No Mete , I did not temper before breaking . Right now I repeated , very easy to break .Here's another picture, perhaps is better to see a cross section ..

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We have about 5 very large circular saw blades from 48" up to 60"..Most are something like 1080 carbon steel plus nickel.Heat treat just like plain carbon steel,anneal easy and work easy.At least one I have is 8670 because it has Moly in it..It will not anneal in ashs, it has to be annealed in the kiln. It will air harden to high 50's RC..It will work harden when you try to drill it if your not very careful..Its a very old blade and makes an awesome knife but its pretty aggrevating to work with..
Remember too guys, Mr Natlek up here is from Macedonia..What is normal for our saw blades might not be normal for his.His may well be made of something with much higher carbon than ours.The germans made a lot of steel like that.
 
Natlek said:
everyone of them is mechanical engineers, they know what they're doing
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As a machinist I find this statement very funny. I have worked with a lot of engineers in the past and you would be surprised how much thy don't know. As the saying goes thoes who can't machine become engineers
 
JTknives google this Mikrosam Mk . Well when I say they make Hi tech things there I mind that and they have first class equipment . :) I know them personally and I know they a good in that they work . I just call there to ask to repeat test and they say don't be silly ........measurement is correct . Now I think that I find place were to ask about this kind of saw .....at least I hope to find out the manufacturer of this wood saw .
 
We are working up a few saw blade knives right now, so I had some to test. Old blade is about 4 foot diameter and acts like 8670.

Heated with a torch & quenched in Parks 50 oil average hardness is 64 Rc. Quenched in water average is 65 Rc.

Natlek, the blade you have must have more carbon.

 
I like that big chopper therein the forefront Don :thumbup: You have obviously used a lot of sawblades too, how thick do the ones you have generally run?
 
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