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And, as you well know, that is why we have to anneal and normalize before we heat treat. Any time we heat into the 2 to 300 degrees above critical, we get grain growth. I made a knife from a file...

Charlie posted an excellent piece on annealing some time back - pictures, and I think video. When I anneal, I cool in a bucket filled with vermiculite. My understanding is to anneal, and then...