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Svet

10¢ forge, made of Ytong

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Your original design will work. No need to get fancy and reinvent the wheel.

 

Your issue is not enough volume inside your forge.

 

All you need is 1500 degrees.

 

I once made a heat treat forge out of "I" beams stacked on a steel table (my burner was a weed killer torch) to treat a short sword and it worked fine.

 

I bet if you just made a square retangular box forge using that material and the I.D. is the size of one of those blocks, it would work fine.

 

You will have a hot spot and you just have to work the blade back and forth.

 

Anyhow think volume, flame development, etc.

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So, I just need a larger diameter tunnel?

What if I just use a smaller flame with this diameter?

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Svet, i think it's a great idea using those blocks as parts for a forge! Even thought they're not supposed to, they do a great job of keeping the heat in.

I made something roughly similar to HT a knife once. I barely got the edge up to critical, but managed to melt the concrete where the hot gases were coming out of the forge. I've still got 2 little vitrified blobs of glass from it. I don't know how hot i got that tunnel, but i needed my welding hood to look inside the main body of it.

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