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I found this bar/block of steel 3" x 3-1/2" x 13 inches at a scrap yard yesterday and couldn't resist at 20 cents per pound.  I have not tried any spark test on it but as you can see in the photo it has some numbers written on it, a lot probably relating to some job. I can make out AMS 5643 and H1075 .  Researching on line these leads to information on heat treating 17-4 stainless (one hour at 900 degree F and air cool yields Rockwell C 44).  The steel is magnetic, but noticeably less so that the jaws of the vise to the left.  It was sold to me as generic steel rather than stainless which would have been five times more money. It would be a rare thing for this yard to miss identify some steel.  I think it looks like a vertical portable anvil once a base is fabricated Any thoughts? 

 

Mystery Steel 042718_DSC3281.jpg

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Ayup, looks just like an anvil. Try testing an out of the way spot with a center punch then small ball pein hammer it might not need heat treating at all.

Frosty The Lucky.

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