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#802 - 09/14/06 01:08 AM Re: Case Coloring Question
James M Offline
Sidelock
**

Registered: 02/16/05
Posts: 7437
Loc: Arizona
It seems that this thread is wandering around a bit but a valid concern has been raised about re-case coloring(hardening) as a restoration process. It certain that this is routinely done by shotgun restorers such as DelGrego and Turnbull and I don't remember hearing about any negative results such as ruined frames until now.
Can someone elaborate on this?
Jim
_________________________
The 2nd Amendment IS an unalienable right.

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#803 - 09/14/06 01:49 AM Re: Case Coloring Question
Oldmodel70 Offline
Sidelock
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Registered: 01/26/04
Posts: 249
Loc: S.E. Minnesota
I would think the frames would be annealed first. Any polishing, filing, profiling, engraving, would be completed in the annealed state. Then the frames are re-casehardened. Would think most danger of brittleness from over hardening would be eliminated. Grant

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#804 - 09/14/06 07:11 AM Re: Case Coloring Question
Rocketman Offline
Sidelock
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Registered: 01/06/02
Posts: 5885
The depth of carbon penetration is controled by time at heat. If it is believed that the current part is sufficiently hard, it is only necessary to recolor at coloring temperature (say in the 500 600 F range - and this is what several of the recolorers seem to be doing). However, to re-establish hardness, one needs to heat above critical for the given steel and quench. Time above critical has no effect on hardness other than increased cabron penetration (the iron "soaks" up more carbon to form a higher carbon alloy which may be harder). If it is believed that the carbon penetration on a given piece is sufficient, a heat to critical and immediate quench will keep carbon penetration to original, re-establish the OE level of surface hardness, and offer the option of re-establishing a color layer (case color) on the surface of the part.

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