Bending high-strength steel

Since the early 1980s, sheet metal fabricators have, for the most part, been following a pretty basic set of rules when it comes to air bending mild steel. To determine the appropriate die opening for bending materials of 0.500 in. (12.7 mm) thick and less, they simply multiplied the material thickness by 8. To calculate the resulting inside radius, they multiplied the width of the die opening...

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