What happened to obsolete Age of Sail cannon

What happened to surplus guns when sailing warships reached the end of their lives?

They might be stored, remelted into new cannon, scrapped, or reused as bollards.

Surplus naval cannon could remain in storage after their ships reached the end of their lives. Other guns were melted down and made into new cannon, scrapped, or reused as bollards. These different outcomes made recycling part of Britain's armaments industry alongside the production of new weapons.