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Unknown line on round bar surface

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This looks to be hot finished bar. That line is from the hot rolling tooling.
Have you tried to grind or turn a sample to see if it has depth? I doubt that it is a lapp or seam.

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P.E. Metallurgy
 
Ditto. Not much to see here.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."
 
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