A bomb disposal team were in Praa Sands this afternoon after a suspicious object was washed up during the recent storms.
The 2ft corroded cylinder was spotted at low tide amongst rocks on the beach several days ago by a passerby.
A specialist team has been unable to get to the site until today due to the tide level.
Bomb disposal experts from Plymouth spent over an hour at the site and were seen digging sand at the Hendra end of the beach.
A spokeswoman for the Ministry of Defence confirmed that the item was non-explosive.
She added: "People are finding metal on the beaches and thinking the worst, but we wouldn't discourage people from reporting things they do find."
Similar findings have been reported across Cornwall in the past few weeks.
Devon and Cornwall Police said the storms had washed up or uncovered items on beaches around the county.
Police are advising members of the public not to approach suspicious looking objects.