How do I thread a galvanized silo rod?

I pulled down a 50 year old cement silo and saved the steel (galvanized I think) bands. I want to make long bolts of various lengths from them to help strengthen the beams in my old barn. The bands appear to be 5/8 “. How difficult will this be to thread the bands using a 5/8 die? Any suggestions to straighten the bands and thread them are welcome.thanks, Ed

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