1. The definition is different: seamless steel pipe is a steel pipe made of a single piece of metal with no seams on the surface. Galvanized steel pipe is a welded steel pipe with a hot-dip or electro-galvanized layer on the surface.
2. The prohibition is different: cold galvanized steel pipes in galvanized steel pipes have been banned. Four ministries and commissions, including the Ministry of Construction of China, have also issued a document stating that galvanized pipes should not be used as water supply pipes since 2000. Galvanized pipes are rarely used for cold water pipes in newly built communities, and galvanized pipes are used for hot water pipes in some communities. Seamless steel pipes have not been banned.
3. Different uses: seamless steel pipes are mainly used as petroleum geological drilling pipes, cracking pipes for petrochemical industry, boiler pipes, bearing pipes, and high-precision structural steel pipes for automobiles, tractors, and aviation. Hot-dip galvanized steel pipes are widely used in construction, machinery, coal mines, chemicals, electric power, railway vehicles, automobile industry, highways, bridges, containers, sports facilities, agricultural machinery, petroleum machinery, prospecting machinery and other manufacturing industries.