How much is the galvanized steel pipe? Generally, galvanized steel pipes go to 5 yuan (DN25-DN40) every 3 meters. Galvanized steel pipes include cold galvanized steel pipes and hot galvanized steel pipes. At present, the use of cold galvanized steel pipes has been banned, and the use of cold galvanized steel pipes is currently prohibited by the state. In 1960s and 1970s, advanced foreign countries developed new pipelines and gradually banned the use of galvanized steel pipes. The Ministry of Construction of China and four other departments have also issued a notice to prohibit galvanized steel pipes from being used as water supply pipes in 2000. Hot dip galvanized steel pipe is widely used in fire protection, electric power, highway and other fields.

Precautions: 1. Before welding, polish the solder joint and wipe off the galvanized layer on the solder joint, otherwise there will be bubbles, sand holes and false welding. At the same time, it will also cause the brittleness and hardness of welding to decrease.

Secondly, the introduction of welding technology: when multi-layer welding, the zinc layer should be melted, evaporated and evaporated as much as possible to make it escape, thus greatly reducing the residue of liquid zinc during welding. In fillet welding, the zinc layer should also melt, vaporize and evaporate in the first layer, and then escape from the weld.

Third, horizontal welding and vertical welding, if J427 and other short slag covered electrode are used, the tendency of undercut is small; If the front and rear belt feeding process is adopted, better weld quality can be obtained.

Legal analysis of the national standard of galvanized steel pipe thickness: when the workpiece thickness is greater than or equal to 6mm, the average thickness should be greater than 85μ m, the local thickness should be greater than 70μm, and when the workpiece thickness is less than 6mm or 3mm, the average thickness should be greater than 70μ m, the local thickness should be greater than 55μm and the local thickness should be greater than 45μ m. This standard does not include centrifugal separation coating. According to GB/T 139 12-2002, the layers and castings were galvanized.

Article 225 of the Criminal Law of People's Republic of China (PRC): Whoever, in violation of relevant state laws and regulations, engages in illegal market activities under any of the following circumstances, causing market chaos, shall be sentenced to fixed-term imprisonment of not more than five years or criminal detention, and shall also be fined not more than five times the illegal income; Under the following circumstances, it will be sentenced to death:

Operating franchise or monopoly commodities or other commodities prohibited by laws and administrative regulations without permission;

Buying and selling import and export, import and export certificates of origin and other licenses and approval documents stipulated by other laws and administrative regulations;

Securities, futures and insurance businesses illegally operate securities, futures and insurance businesses or illegally operate fund payment and settlement businesses without the approval of the relevant competent authorities;

Other illegal business practices that have a serious impact on the market.