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Old 12-19-2018, 05:10 PM   #1
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4340 chromoly steel -polish

Any metallurgy experts on here?

Can the "black" surface of 4340 chromoly steel be polished to a gunmetal gray shine with a dremel?
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Old 12-20-2018, 08:30 AM   #2
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Sure that's the scale from heat treat under that is shiny metal you only need elbow grease to expose it .
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Old 12-22-2018, 04:00 PM   #3
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Thanks man that is what I wanted to hear.....wasn't sure how deep the scale / discolouration went.
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