I've bent my rotary mower blade and have already ordered a replacement.
In the meantime if I heat up the blade I can probably straighten it out but how do I put the correct temper back into the steel after heating....
Here in the states, the blade seems to not be tempered.
They can be sharpened with a file and seem to bend, with out much effort.
I don't think I would try heating one of them, if it was brittle and broke, it would be going fast and dangerous.
Robert