Thank you, we enjoyed learning of the salt bath purpose and that EvenHeat makes this unit atop Heat Treat furnaces. Concern remains for us about the salt vapor leaking because it would be near very technical precision machinery. Lance & Patrick.
0-1 tool steel is one of the easiest steels to heat treat because of the high carbon content and the predictable hardness vs. tempering to achieve desired hardness. The best knives that I have ever heat treated have been made out of 440C material and ran in a vacuum furnace and they come out bright and shiny because there is no oxidation.
+Evenheatkiln I need to ask something. The salts you have on your web-page for the model 818 max out at 1650F...a lot of common popular knife steels are heat treated above that, like AEB-L for instance, the sweet spot being 1975F in my experience. Can you supply or point me in the direction of salts rated for 2000F or above. This is the only thing hindering my decision to buy this unit, I do not want any steel restrictions when spending this kind of money. Cheers! Griff.
@@Madskills-hw2ox Have a look at www.substech.com/dokuwiki/doku.php?id=salt_bath_heat_treatment They list a salt going up to 1250 deg C (or 2282 deg F for you guys who don't use the same units as the rest of the world) It's toxic though, so this might be why they havent listed it.
10 minute soak in salt? The only reason we have soak times is to ensure the blade is thoroughly heated at that set temperature. 10 minutes in lead or salt seems in A lot of time. Considering a 3 sixteenths or .190 thick blade like that will reach temperature in about 40 seconds... Don't you think grain growth will occur? In lead we are having phenomenal results bringing it up to even temperature in about a minute and quenching. Each quench is a grain refinement cycle. But I see no reason for the extra time at temperature with such quick heating thoroughly...thoughts?
High alloy steels still need a soak time because the carbides can take a while to dissolve and get the alloys into solution. Grain growth is mostly caused by excessive temperatures with time being a lesser factor. The presence of carbides also help by "pinning" the grain boundaries.
+Evenheatkiln Are the safety concerns the same for low level temperatures? For example if I wanted to temper at 350 degrees. Would the liquid explode if there was something foreign on the blade at that temperature?
Thanks for this useful tutorial. It satified my curiosity about salt bath kilns after seeing them advertised in Blade Magazine.
Thank you, we enjoyed learning of the salt bath purpose and that EvenHeat makes this unit atop Heat Treat furnaces. Concern remains for us about the salt vapor leaking because it would be near very technical precision machinery. Lance & Patrick.
Great stuff - Now you got me saving up for a salt bath!
id love this for barrel making
0-1 tool steel is one of the easiest steels to heat treat because of the high carbon content and the predictable hardness vs. tempering to achieve desired hardness. The best knives that I have ever heat treated have been made out of 440C material and ran in a vacuum furnace and they come out bright and shiny because there is no oxidation.
@5:40, 1500 deg F or C. Thanks.
+Evenheatkiln I need to ask something. The salts you have on your web-page for the model 818 max out at 1650F...a lot of common popular knife steels are heat treated above that, like AEB-L for instance, the sweet spot being 1975F in my experience. Can you supply or point me in the direction of salts rated for 2000F or above. This is the only thing hindering my decision to buy this unit, I do not want any steel restrictions when spending this kind of money. Cheers! Griff.
Griffiths Handmade-Knives
One year ago and still no reply 🤔
I’d like to know too
@@Madskills-hw2ox Have a look at www.substech.com/dokuwiki/doku.php?id=salt_bath_heat_treatment
They list a salt going up to 1250 deg C (or 2282 deg F for you guys who don't use the same units as the rest of the world)
It's toxic though, so this might be why they havent listed it.
10 minute soak in salt? The only reason we have soak times is to ensure the blade is thoroughly heated at that set temperature. 10 minutes in lead or salt seems in A lot of time. Considering a 3 sixteenths or .190 thick blade like that will reach temperature in about 40 seconds... Don't you think grain growth will occur? In lead we are having phenomenal results bringing it up to even temperature in about a minute and quenching. Each quench is a grain refinement cycle. But I see no reason for the extra time at temperature with such quick heating thoroughly...thoughts?
High alloy steels still need a soak time because the carbides can take a while to dissolve and get the alloys into solution. Grain growth is mostly caused by excessive temperatures with time being a lesser factor. The presence of carbides also help by "pinning" the grain boundaries.
Doesn't the molten salt also impart nitrogen into the steel, or am I making that up?
I think that's at a lower temperature, with a different kind of salt.
Are you salt bath nitriding or carburizing? The temperature ranges you say makes me think carburizing but just wanted to be sure.
+Evenheatkiln Are the safety concerns the same for low level temperatures? For example if I wanted to temper at 350 degrees. Would the liquid explode if there was something foreign on the blade at that temperature?
350°F is too cool for a NaCl or NaNO3 bath, if you wanted a tempering bath in that range a low-melting alloy might be a better choice.
Ben Cambier ok if you used a low temperature salt bath do you need to worry about the liquid splash back issues that a high temperature has?
@@Udeus5 Yes Sir, you do. Very violent.