How many inches of steel can an AK47 using 7.62x39mm rounds penetrate through?
It can't go through inches. It can go through up to 1/4 of an inch of plate steel but not much more. An M-16 can go through it as well and has less powder behind it but the 7.62X39 is a fat round and it takes a little more to get it through.
Yes it can, it also depends where the ammunition were made. Some ammunition made outside russia will not penetrate steel plates. Places like Somalia, Iran,and Iraq.
A very thin layer of steel. I've fired the AK47 at tanks, ofcourse that wouldn't penetrate but it's not going to penetrate anything crazy. It is a strong Assault Rifle don't get me wrong.