Galvanized steel pipes are divided into cold-galvanized steel pipes and hot-dip galvanized steel pipes. Cold-galvanized steel pipes have been banned, and the latter is also recommended by the state to be temporarily used. In the 1960s and 1970s, developed countries in the world began to develop new

The hot-dip galvanizing technology of seamless steel pipes can usually be divided into two types: dip plating and blow platingDip plating: direct water cooling after immersion plating, average thickness of zinc layer is more than 70 microns, galvanizing cost is high, zinc usage is large, used in nor