Hi There Got-Ya,
I do not know what grade it is, but the person I got the sheet from says that they use it for shelving.
I just uploaded a post of my magazine project with the basic info and pics of magazine and materials etc.
You will find it under firearms and shooting as a new post.
I cannot harden it is I would have liked, as the steel has a very low carbon content. (you can bent or shape without applying heat) It holds the shape very well.
PS!, I am not a gunsmith or metal smith so my knowledge of steel and composition etc, is Greek to me.
Thanks for the info.
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