 Entering service from 1955 through 1960, these vessels were completely removed from naval service by the mid-1990s, and were transferred to civilian law enforcement agencies.However, just like the "Beihai", "Huangpu", and "Yulin" class gunboats which had been transferred to law enforcement agencies, these obsolete and aging boats were not satisfactory in their new civilian roles, due largely to their low maximum speed (10 knots), which was not sufficient to catch the smugglers' high-speed motorboats.As a result, these boats were subsequently transferred again, this time to the reserves; or subordinated to naval militias in various Military Maritime Districts in China as training boats, or harbor patrol boats.