Views: 0 Author: Site Editor Publish Time: 2022-04-12 Origin: Site
Application of hot-dip galvanized steel pipe: mainly used for conveying gas and heating.
In gas, greenhouse and heating, the kind of iron pipe is also galvanized pipe. As a water pipe, galvanized pipe produces a lot of rust and scale in the pipe. The yellow water not only pollutes the sanitary ware, but also mixed with bacteria breeding on the unsmooth inner wall. Corrosion causes the content of heavy metals in the water to be too high, which seriously endangers human health. In the 1960s and 1970s, developed countries in the world began to develop new types of pipes and successively banned galvanized pipes. China's Ministry of construction and other four ministries and commissions have also made it clear that galvanized pipes have been banned since 2000. At present, galvanized pipes are rarely used in cold water pipes in new residential areas, and galvanized pipes are used in hot water pipes in some residential areas.
Hot dip galvanized pipe: in order to improve the corrosion resistance of steel pipes, general steel pipes are galvanized. Galvanized steel pipes are divided into hot-dip galvanizing and electro galvanizing. The hot-dip galvanizing layer is thick, the cost of electro galvanizing is low, and the surface is not very smooth.
Hot dip galvanized pipe is to make molten metal react with iron matrix to produce alloy layer, so as to combine the matrix and coating. Hot dip galvanizing is to pickle the steel pipe first. In order to remove iron oxide on the surface of the steel pipe, after pickling, it is cleaned in ammonium chloride or zinc chloride aqueous solution or ammonium chloride and zinc chloride mixed aqueous solution tank, and then sent to the hot dip galvanizing tank. Hot dip galvanizing has the advantages of uniform coating, strong adhesion and long service life. Complex physical and chemical reactions take place between the steel pipe matrix and the molten plating solution to form a corrosion-resistant zinc ferroalloy layer with compact structure. The alloy layer is integrated with the pure zinc layer and the steel pipe matrix. Therefore, it has strong corrosion resistance.
1. Uniformity of zinc coating: the steel pipe sample shall be immersed in copper sulfate solution for 5 times without turning red (copper plating color)
2. Surface quality: the surface of galvanized steel pipe shall have a complete galvanized layer, without black spots and bubbles, and small rough surfaces and local zinc nodules are allowed.
3. Weight of galvanized layer: according to the requirements of the demander, the weight of galvanized steel pipe can be measured, and its average value shall not be less than 500g / m2, and any sample shall not be less than 480g / m2.
Pre-Galvanizing Pipe is widely used in petroleum ,chemical industry, construction, shipbuilding, communications, electricity and underground gas pipelines and many other fields.
Pre-Galvanizing Pipe is galvanizing, Zinc layer is an electroplating layer, and zinc layer is separately stratified with the steel tube matrix.
Pre-galvanized steel pipe is the treatment of steel pipe before galvanizing: degreasing treatment, derusting treatment, phosphating treatment, drying treatment.
Hot dipped galvanized steel pipe is in manufacturing process using steel pipes of removed rust dipped into zinc liquid of 500℃ temperatures, and making steel surface attached zinc layer so as to achieve the purpose of anti-corrosion.
Hot galvanizing process specially suitable for kinds of strong-acid, alkali fog and other strong corrosive conditions. This kinds of fastener used a lot in outside of steel tower contribution.
Black steel pipes have a variety of use. Thanks to their strength and needs for little maintenance. They tend to be used for transporting gas and water to rural areas and urban areas or for conduits that protect electrical wiring and deliver high pressure steam and air. In addition, black steel pipes are also used in oil and petroleum industries for piping large quantities of oil through remote areas.
Other uses of black steel pipes include gas distribution inside and outside homes, water wells and sewage systems. However, black steel pipes are never used for transporting potable water due to the fact that they tend to corrode in water and mineral of the pipe will dissolve into the water and clog the line as well.
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Seamless pipes are manufactured by extruding the metal to the desired length. Thus, they do not have any joint in its cross-section throughout its length. seamless pipes are marketed on an outdated myth that it does not have flaws but that welded has an inherent flaw throughout the length of each tube, as stated above. Intuitively this concept is easily accepted by purchasers and designers with limited experience with the various products.
Steel porp refers to the use of steel pipe, H-shaped steel, angle steel, etc. to enhance the stability of the engineering structure. Generally, it is an inclined connecting member, and the most common are herringbone and cross shapes. Steel supports are widely used in subways and foundation pits. Because the steel support can be recycled and reused, it is economical and environmentally friendly.
Steel coil is sheet metal supplied in coil form. Depending on the production method, such coil is classified as hot-rolled, cold-rolled, galvanised or polymer-coated . Steel coil is used across industry, the main consumers being the construction and machine-building sectors.
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