Carpenter A-421 Knife Steel

I am supposed to be getting some of this steel soon but I wanted to write up an analysis of the composition first. There was an article from BladeHQ about the steel and also a video from TKell Knives so I have gotten some questions about it. Background I was able to talk to Robert Buck, the developer of these steels, so when I got an answer to questions I had I will provide it, otherwise the following is my own analysis and speculation and shouldn’t be construed as anything official. Thank you Dr. Buck for speaking to me about the steel! Carpenter’s A-421 knife steel actually started out as A-21 steel, which is the only version of the product that currently has a page on Carpenter’s website: https://www.carpentertechnology.com/alloy-finder/a-21 Here is the composition of A-21 according to the data sheet: There are a bunch of ranges and maximums so here is the simplified composition using averages of each range. I also included A-421 which is the same apart from the carbon content. I…

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