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How To Dealing with heat treat decarburization and scale

M

machinist60

Joined
Jan 3, 2008
Messages
2
I have been searching for an anti-decarburizing/scale coating to use when heat treating O1. I came across the recipe in https://www.bladeforums.com/threads/diy-anti-scale-compound.670773/ post#7. There is a picture of the back side of a plane makers float. If anyone can provide advice about why the residual scale and how to remove it without abrasion it would be much appreciated thanks. Abrasive removal is not really an option because the teeth should remain sharp after cleanup.

https://drive.google.com/file/d/1JXV2eFm-yWphX_yIzdSg-VTK1ZlD8gwV4A/view?usp=drivesdk

https://drive.google.com/file/d/1iZW4WfoFkYN4Uy0u0cuyAV7fMVjOAT1ZgA/view?usp=drivesdk
 
When Turco II was easily available I used that. Any refractory clay that can be applied as a thin coat will work fine. Staanite ATP-641,etc.

Personally, I don't worry about it much on carbons steel.
1) You should have the forge atmosphere adjusted to reduce decarb/scale
2) You have to take a certain amount of steel off the blade in finishing, and the decarb/scale all gets removed anyway.
3) An overnight soak in sodium bisulfate solution ( PH down or pickle) removes the scale just fine.
 
Stacy E. Apelt - Bladesmith said:
When Turco II was easily available I used that. Any refractory clay that can be applied as a thin coat will work fine. Staanite ATP-641,etc.

Personally, I don't worry about it much on carbons steel.
1) You should have the forge atmosphere adjusted to reduce decarb/scale
2) You have to take a certain amount of steel off the blade in finishing, and the decarb/scale all gets removed anyway.
3) An overnight soak in sodium bisulfate solution ( PH down or pickle) removes the scale just fine.
Click to expand...

1: 6" of visable flame from the mouth seems to work well on my forge

3: HCL removes scale quickly and won't overetch steel in any shortish period of time. Vinegar/salt pickle will do the same but take longer, you could probably leave the steel for a week or more without issue. I almost always pickle prior to grinding to save belt life.
 
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