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To achieve a nice tight fold you would need about 17 tons, but i doubt you achieved such a tight radius, with a much bigger rad you may have used as little as 5/6 tons. (these tonnages are using a press mind, a hand folder might be a bit different.)
Theres lots of factors that decide how much pressure you will need, thicknes, size of fold, inside radius, tooling...
Theres lots of factors that decide how much pressure you will need, thicknes, size of fold, inside radius, tooling...