I need a high power transformer with 240VAC primary at 10-16A and secondary of 6VAC 350-400A. I calculated that I would need a transformer core with cross sectional area of about 45cm2 to able to use about 1:1 windings per voltage.
My question is, how well will 0.5mm thick 1020 steel with 10-50micron zinc plating compete as tranformer core? I have two choices: take apart a bunch of microwave transformers or make one myself, and getting silicon steel sheets is impossible at any sensible price for me.
For getting 45cm2 CSA im planning on making a transformer EI type with core size 95x50mm, as using 100 pcs stack of 0.5mm plates.