steel too hard to drill

4

440-c

Joined
Apr 21, 2012
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19
I just made a billet of 1084 and 15n20 304 count layers 2x2x9". I normalized it twice then band sawed the blades out, seemed fine at this point. Drill milled them to even thickness then surface ground to finish. Did the first grind of cutting edges and ground all scratches on flats out to 120 grit. Went to drill holes for handles and couldn't (too hard). My question is why and how do I remedy the problem. Can you get the steel too hot when grinding and make it hard again. Should I normalize or anneal? best thoughts. After the hole drilling is complete what's the proper steps to get to heat treating stage? Thanks
 
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