Do I need to do something to them to put the strength back into them?
they really never had any strength to begin with. no reason you can't use them for convenience hooks though, keep chains out of the way or off the ground etc... without relying on them for any pulling/liftng.
btw, nice job:thumbsup:
I agree - what is your planned use for them?
if you let them cool slowly vs quenching hot.. they are likely more ductile than when rolled.. .. a lil less 'strong' but not brittle.. etc.
probably ok for your use... I kow a blacksmith that does wrought iron work for some horse cart people. I'd bet some square and round stock got incorporated into a cart now and then..
After I heated and bent them I let them air cool. Does that count as let them cool slowly?