Cannot say anything as a metal expert, but I think the life of your barbells
will depend on the content and quality of the cast iron. Being barbells,
probably made in China, they used the cheapest, easiest to get iron to make
the barbells. Since they only function to be a weight, there will be no need
for a good quality iron to be used.
That said, I used to work for a gas utility, and they still had cast iron
gas mains in use that were close to 150 years old. Ordinary steel mains
required coatings and anodes to prevent corrosion but the cast iron needed
nothing to keep it in good useable condition. I can only assume that the
iron that was used to make them was a good quality iron made to a specific
I'm thinking a four foot section or so of rail road track (iron).
Torch a hole in one end, tie it off and drop it where you like.
(I've got an anvil made from a track)
"Well, it doesn't happen all the time, but when it happens, it happens
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