Thread: What are the marks, post heat treat?
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Old 01-01-2016, 06:14 AM
WBE WBE is offline
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Join Date: Feb 2009
Posts: 484
Look like decarb and scale scars. Possibly from over heat, or lack of protection during upper heat level. All you can do with that is to sand it out best you can, and live with it.
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