im looking for some flat spring steel 2mm in thickness and roughly 20 mm in width and about 300 mm long so not a big piece,its for the back springs of a small folding knife im making
Buy some 2mm O1 tool steel from Cromwell it's not expensive and you can spring temper it quite easily following instructions you can find anywhere on the internet. The method I use is simple, heat it to non mag and quench in oil then take it out and blow lamp it till the oil flares off. I repeat the flare off a couple more times and haven't had a fail yet.