A Boma

[DaveH]

I was told the flat bar as sold is in the annealed state. However because the bars have to be straightened and this is done cold so there is a little induced stress.
A lot of the stress will come from the welding and cold forming mainly by me   so the whole thing would need to be annealed and the process of heating it will cause distortion and may be some of the welds may crack in the process. 

If I don't light a fire in it, then it should be fine Or use rivets as suggested earlier in this thread.
 
DaveH