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 to other vessels, six hulls were built at Zelenodolsk in 1954. They were then transported by rail to Guangzhou and Shanghai, where they were commissioned into the People's Liberation Army Navy and classified as the Type 6604 submarine chaser.