Has anyone ever seen this before?

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I just bought a welding/work table. (came out of an old manufacturing company.)It has a 1" plate top.  I applied paint stripper and removed a couple layers of paint, and then found this...It appears to be a very thin layer of steel on top of the 1" plate... I say steel because the chips will stick to a magnet...Is this a coating or do (did) some types of plate have a very thin layer ?  The plate underneath is great.  but that thin layer on top is chipped from years of use..It is a major pain in the azz to get it off... I'm afraid I may have to put the angle grinder to the whole table... any ideas? Attached ImagesMiller 211Hypertherm PM 451961 Lincoln Idealarc 250HTP 221  True Wisdom only comes from Pain.
Reply:Congratulations, you've discovered (er... uncovered) mill scale.Visit Tensaiteki.com
Reply:If you mount a belt sander in a “Shoe” to control the depth of cut, you can sand the top level without gouging the surface.
Reply:Originally Posted by transitbelt sander in a “Shoe”
Reply:Got any shots of the whole enchilada? Looks nice.Just another clown trying to be cool
Reply:Originally Posted by TensaitekiCongratulations, you've discovered (er... uncovered) mill scale.
Reply:Originally Posted by slagmaticGot a link?
Reply:Boiler plate.....David Real world weldin.  When I grow up I want to be a tig weldor.
Reply:So , the plate was made this way?or did this develop over time?Miller 211Hypertherm PM 451961 Lincoln Idealarc 250HTP 221  True Wisdom only comes from Pain.
Reply:Originally Posted by John TSo , the plate was made this way?or did this develop over time?
Reply:Originally Posted by jinkzdGot any shots of the whole enchilada? Looks nice.