Knife Making Tools Part 20: Heat Treating Ovens 

It depends on the steel but most steels it's above its curie temperature so around 1500 degrees Fahrenheit. I wouldn't know if the kilns will get that hot but a good test is to put a magnet close to it. If it pulls the steel its not hot enough.

typically fire brick like substance or ceramic.

Yeah, it only happens on my older videos and it only effects iPhones 6's (I think). Something to do with the way RU-vid processes audio codecs during file compression. Or something. The sound works fine on most devices. No clue why it happens, but there's nothing I can do about it now.

No I have an iPhone 5 and I have the same problem

+Walter Sorrells iT Also affects iPhone 5

Yeah I phone 5 as well. Oh well the important info audio worked so it's all good. Thanks for all your videos. I'm hoping to make my first knife sometime soon. I just need to buy a little bit of steel and other materials.

Does it on Galaxy s7

You can temper iT in a toaster oven on 240 degrees cel for an hour you can het threat iT by air quincing iT

You should check The Hardnes bij going over iT with a file If iT Scratches you should redo your het threat

thank you sir

+Arshia Hematpoor Please dont call me sir im just a interested kid

:) thanks man

+Tim Kinsey "Hot rolled" is just an industry term for the way that it's squashed into shape. It doesn't refer to the alloy composition. Without knowing that type of alloy you're dealing with, there's no way to know.

Ok Thanks! That helps a lot.

Mine 1 hour and 50 mins. But it's only 2.5 KWatt.

Dempends on what steel you use If you use stainless what i Gues for a filet knife jou should harden The edge not The spine That means you have a hard edge and a flexibel spine

flexibility is a function of geometry, not the steel. The quality of the steel and the heat treat will determine how much a blade will flex before it stays bent or breaks. for fillet knives, AEB-L stainless is a great steel. Begin with .070 inch thickness for a 6inch to 9inch blade (not counting the handle length, just the blade). You'll want to heat treat the blade first and grind it hard. Steel that thin probably won't stay straight if you don't harden it first. I like AEB-L at 61 - 62 HRC hardness. For a decent amount of flex, give the blade a distal taper so that it is about .040 at the heel of the blade and taper it down to about .020 at the tip.

+Kurtis Coleman Probably not -- unless you have really specific knowledge about what kind of steel it is.