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Heat Treating and Metallurgy Discussion of heat treatment and metallurgy in knife making.

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  #1  
Old 03-07-2017, 03:55 AM
Zain Zain is offline
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Smile Liquid Bath Carburizing

HELLO Everyone !

My company is performing Cyanide salt bath carburizing. As it is known that carbon potential of the salt bath decreases with the passage of time. So in order to to compensate for the decreased carbon potential additions have to be made. My question is that how can we measure the carbon potential of the salt bath?

Thanks in advance

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Zain Siddiqui
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Old 03-07-2017, 09:13 AM
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Ed Caffrey Ed Caffrey is offline
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To compensate for the decrease in the salt bath, I always have a layer of broken up carbon arc rods on the surface of my salt tank. I use a neutral salt in my tanks, and cannot fathom why your company would use cyanide salt baths..... that's nothing but a death trap..... HIGHLY TOXIC!

With the type of salts I use, it has the advantage of absorbing the carbon from the arc rods as it needs it, keeping itself in a neutral state.

What I don't understand is why your company goes to all the trouble, expense, and danger when about the best you can hope for is basically a "case hardening" effect on the steel..... and there are much cheaper and safer ways to do that.


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Old 03-07-2017, 10:04 PM
Zain Zain is offline
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Ed Caffrey, I second you for the toxicity of the process but we take full safety measures. The process has its advantages like uniform heat, short cycle time, less space, shallow cases easily available at low temperature etc.

Any specific method for checking Cyanide content of the bath???
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Old 03-08-2017, 09:34 AM
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No idea on how to check the cyanide content..... I'm not even aware of any such equipment. I suspect that's because in most places the use of cyanide is severely restricted due to the toxicity.


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carbon, case, heat, how to, made, safety, salt, steel, surface, trap


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