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Thanks for your replies. there are no nuts. The bolts are screwed into the cast iron boiler. Would heat help? Does cast iron expand?

I have a cast iron steam boiler to heat my home. the stam has been leaking from a metal plate on the side of the boiler held on by 6 metal bolts. Two of the bolts appear to be rusted. What is the best way to remove these bolts without damaging the cast iron boiler? Should I run the boiler before...