In addition, 6 hulls were built at Zelenodolsk in 1954, transferred in parts by railway to Guangzhou (2) and Shanghai (4) and commissioned into the People's Liberation Army Navy, and were designated as the Type 6604 submarine chaser.
In addition, six hulls were constructed at Zelenodolsk in 1954, which were later divided and transported by rail to Guangzhou (2) and Shanghai (4), before being accepted into the People's Liberation Army Navy and designated as Type 6604 submarine chasers.