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I’m eventually going to stop plugging my book Knife Engineering in every new article, but that day is not today. Go buy one for yourself, and everyone you know, as a Christmas present.
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This article has a moderate amount of background metallurgy information in it. I explain briefly the necessary background information and provide links to earlier articles with more complete explanations. However, to get a full picture of steel metallurgy and heat treating, the easiest way is to read my book Knife Engineering.
