IPN200 Evaluation of Reduced Ductility Due to Bending

I wouldn't do it that way, but if I did, I would anneal it, have it heated to a dull cherry and then allowed to cool. perhaps in repeating stages. Years ago, I would have had it blacksmithed, heated and bent while hot. Now I would use the same technique that they use for heat straightening, heat short lengths of the inside flange to dull cherry and let it cool. Repeat until the bend is where you want it. You may need this technique anyway if you have tight tolerances, rolling a bend is not very accurate, you don't know the magnitude of the spring back that occurs after rolling until it happens.

The price quoted is for cold bent, hence the problem. If it needs to be annealed or normalised then the price will be too high. For the tolerances, the bending company is well reputed and will be able to allow for the spring back in its rolling process as they have already done this tight a radius before. But it may not have been such a structural usage and so they could get away with the strain hardening that occurred without any bother from the authorities. Our current fallback solution is to do a fully welded up section but again this will be more expensive.