Metal for SCA armor

[Quintus Claudius Scaevola]

A sheet of 20 or 18 cold-rolled isn't that expensive, from my local area. A 4' x 4' sheet should give you more than enough material to work with, including some leftover in case you need it. I think I paid $35 or so...sorry; $35.52. I don't have experience with the 4130 (I have no idea what grade I picked up), but honestly I don't think it matters that much...