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Hello everyone... I have access to these pump bearings. I tried looking into the type of bearing steel it is and whether its case hardened or not. I had bearing material that wouldn't harden before, not even in water. I came to the conclusion that particular bearing may be case hardened. I know there's better steels out there, but I like to understand what I have. The make of this current bearing is from: SKF 7315 EXPLORER. I cut the race off, the balls are about 1" in diameter. I then cut a piece off the race, hammered to about 1/8" thick. I quenched in water and it broke in half pretty easy. I am curious about the grain structure...its very coarse. To those with experience, does it have significance? If I wanted to make a blade with the race, would it be usable? Thanks for any input! I think I may have found my answer. The grain structure very much looks like the one pictured in this link: http://reidonline.org/bladesmithing/intro/normalizing.htm I'll continue to experiment and have fun! If there's additional input...feel free. Thanks