Kiln temperatures for heat blackening

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Sean Powell
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Kiln temperatures for heat blackening

Post by Sean Powell »

Hello,
I know people successfully heat blacken (without oil) in a kiln (or even some ovens). Does anyone know what temperatures and times produce what colors? I can only find data for what temperatures gets steel to glow at certain colors.
Thanks,
Sean
Thomas Powers
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Post by Thomas Powers »

Look under tempering colours, a dark blue is usually in the 500-600 degF range depending on alloy.

Thomas
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Kenwrec Wulfe
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Post by Kenwrec Wulfe »

Excellence is an art won by training and habituation. We do not act rightly because we have virtue or excellence, but we rather have those because we have acted rightly. We are what we repeatedly do. Excellence, then, is not an act but a habit. -Aristotle
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Kenwrec Wulfe
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Post by Kenwrec Wulfe »

Excellence is an art won by training and habituation. We do not act rightly because we have virtue or excellence, but we rather have those because we have acted rightly. We are what we repeatedly do. Excellence, then, is not an act but a habit. -Aristotle
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Cet
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Post by Cet »

As tom said peacock blue/purple from 500-600 followed by sort of grayish blue within 100 degrees. the cour change isn't very rapid in a kin so you can just keep peaking.

It will vary slightly with steel type and even ambient conditions.
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