Difference between hot-dipped galvanized steel pipe and cold galvanized steel pipe

1. Cold galvanized pipe and hot-dipped galvanized pipe has a great difference in the operation mode. The zinc in hot-dipped galvanizing is obtained at 450 degrees Celsius to 480 degrees Celsius, while the zinc in cold-galvanized steel pipe is obtained by electroplating at room temperature.

2. Cold galvanized pipe and hot-dipped galvanized pipe has a great difference in galvanized layer thickness .The thickness of zinc in hot-dipped galvanized steel pipe is much thicker than the thickness of zinc in cold galvanized steel pipe.

3. Cold galvanized pipe and hot-dipped galvanized pipe has a great difference in the surface smoothness .The surface of cold galvanized steel pipe is much rougher than the surface of hot-dipped galvanized steel pipe.

4. Cold galvanized pipe and hot-dipped galvanized pipe also has the very big difference on price.Hot-dipped galvanized steel pipes are producing in standard factory ,in order to guarantee the quality of the galvanized pipe, galvanized and the equipment is obsolete, The most of relatively small size companies using galvanized naturally. Cold galvanized steel pipe is much cheaper than hot-dipped galvanized steel pipe.

5. Cold galvanized pipe and hot-dipped galvanized pipe also has the very big difference on adhesion.adhesion cold galvanized steel pipe than in hot-dipped galvanized steel pipe on the poor adhesion of many, because of the steel tube of cold galvanization steel tube is independent between substrate and zinc layer, the zinc layer is very thin, but also simple attached on the steel substrate, so cold galvanization steel tube is very easy to fall off.

Cold galvanized steel pipe, using electroplating process, only galvanized on the outer wall of the steel pipe, the inner wall of the steel pipe is not galvanized; Hot-dipped galvanized steel pipe is hot dip galvanized process, the inner and outer walls of the steel pipe have zinc layer, the country has made the relevant provisions, cold galvanized steel pipe can not act as gas pipe and water pipe, cold galvanized corrosion resistance is too poor, zinc layer is also easy to fall off, because of the safety risks have been banned by the state.