Ordinary galvanized steel pipe 3~5 yuan a meter (DN25~DN40).
Galvanized steel pipe is divided into cold galvanized steel pipe, hot-dip galvanized steel pipe, cold galvanized steel pipe has been banned, the latter is also advocated by the state temporarily can be used. In the sixties and seventies, the international developed countries began to develop new types of pipe, and successively banned galvanized pipe.
China's Ministry of Construction and other four ministries and commissions have also issued a clear from two thousand years from the ban on galvanized pipes as water supply pipes, cold water pipes in new communities have rarely used galvanized pipes, some of the hot water pipes in some districts use galvanized pipes. Hot-dip galvanized steel pipe in the fire, electricity and highway has a wide range of applications.
Expanded Information:
Precautions:
Firstly, the weld at the weld before welding Must be polished The galvanized layer at the weld must be polished off, otherwise it will produce bubbles, trachoma, false welds and so on. It will also make the weld brittle and less rigid.
Second, the introduction of welding techniques: in the welding of the first layer of multi-layer welding seam, try to make the zinc layer melting and vaporization, evaporation and escape from the weld, can greatly reduce the liquid zinc in the weld. In welding fillet weld, the same in the first layer as far as possible to make the zinc layer melting and vaporization, evaporation and escape from the weld, the method is to move the end of the electrode forward about 5 ~ 7mm or so, when the zinc layer melting and then return to the original position to continue forward to continue to weld.
Third, then horizontal and vertical welding, such as the choice of short slag welding rod such as J427, biting tendency will be very small; if the use of front and rear back and forth to transport technology, more can be obtained without defects in the quality of the weld.
Baidu Encyclopedia - Galvanized Steel Pipe