I found these stainless steel wires (in diameters 0.3mm to 3mm) being sold in affordable prices.

rolls of ss wire

My question is whether it’s a good idea to wound a thin wire (0.3mm diam.) like the top-right donut shape in this picture : donut Then laminate it with epoxy or something else and use it as a transformer core ?

(It’ll be a 220v to 24v transformer)