The knowledge of Galvanized steel pipe

Galvanized steel pipe is to make the molten metal react with the iron matrix to produce an alloy layer, so that the matrix and the coating are combined. Hot-dip galvanizing is to pickle the steel pipe first. In order to remove the iron oxide on the surface of the steel pipe, after pickling, it is cleaned in the tank of ammonium chloride or zinc chloride aqueous solution or mixed aqueous solution of ammonium chloride and zinc chloride, and then sent to the in the hot dip bath. Hot-dip galvanizing has the advantages of uniform coating, strong adhesion and long service life. The galvanized steel pipe substrate undergoes complex physical and chemical reactions with the molten bath to form a corrosion-resistant zinc-iron alloy layer with a tight structure. The alloy layer is integrated with the pure zinc layer and the steel pipe matrix, so it has strong corrosion resistance. The following paper will take you to know about the knowledge of galvanized steel pipe and the application of galvanized steel pipe as well as the excellent galvanized steel pipe manufacturer and supplier.

Application

The following paper will take you to know about the application of galvanized steel pipe. Galvanized steel pipe is widely used in construction, machinery, coal mining, chemical industry, electric power, railway vehicles, automobile industry, highways, bridges, containers, sports facilities, agricultural machinery, Petroleum machinery, prospecting machinery, greenhouse construction and other manufacturing industries.Galvanized steel pipe is a welded steel pipe with a hot-dip galvanized or electro-galvanized layer on the surface. Galvanizing can increase the corrosion resistance of steel pipes and prolong the service life. Galvanized pipes are widely used. In addition to being used as pipeline pipes for general low-pressure fluids such as water, gas, and oil, they are also used as oil well pipes and oil pipes in the petroleum industry, especially in offshore oil fields, and oil heaters and condensers in chemical coking equipment. Pipes for coolers, coal distillation washing oil exchangers, and pipes for trestle piles and supporting frames of mine tunnels, etc.

The influence of material

(1) Carbon; the higher the carbon content, the higher the hardness of the galvanized steel pipe, but the worse its plasticity and toughness.

(2) Sulfur; it is a harmful debris in galvanized steel pipe. Galvanized steel pipe with high sulfur content is easy to be brittle and cracked when pressure is processed at high temperature, which is usually called hot brittleness.

(3) Phosphorus; it can significantly reduce the plasticity and toughness of galvanized steel pipe, especially at low temperature. This phenomenon is called cold brittleness. In high-quality steel, sulfur and phosphorus should be strictly controlled. But on the other hand, the high content of sulfur and phosphorus in low carbon steel can make it easy to cut, which is beneficial to improve the machinability of galvanized steel pipe.

(4) Manganese: It can improve the strength of galvanized steel pipe, weaken and eliminate the adverse effects of sulfur, and improve the hardenability of steel. High-alloy steel (high-manganese steel) with high manganese content has good resistance to Abrasiveness and other physical properties.

(5) Silicon; it can improve the hardness of galvanized steel pipe, but the plasticity and toughness decrease. The steel used for electrician contains a certain amount of silicon, which can improve the soft magnetic properties.

(6) Tungsten; can improve the red hardness and thermal strength of galvanized steel pipe, and can improve the wear resistance of steel.

(7) Chromium; can improve the hardenability and wear resistance of galvanized steel pipe, and can improve the corrosion resistance and oxidation resistance of steel.

(8) Zinc; in order to improve the corrosion resistance of galvanized steel pipe, general steel pipes (black pipes) are galvanized. Galvanized steel pipe is divided into two types: hot-dip galvanized and electric steel zinc. The hot-dip galvanized galvanized layer is thick and the cost of electro-galvanized is low, so there are galvanized steel pipes.