What Corrosion Phenomena Will Occur in Thick-walled Steel Pipes in the Construction Industry?
What corrosion phenomena can occur in thick-walled steel pipes?
(1) Concentration cell corrosion: Corrosion cells composed of different electrode potentials due to the difference in the concentration of the corrosive near the electrode surface are called concentration corrosion cells. Underground large-diameter seamless steel pipes are common in corrosion batteries formed by different oxygen content in one place and another in the solution (or soil) resulting in different electrode potentials. The area with low oxygen concentration will become the anode area, and corrosion will accelerate. In fact, the corrosion mechanism of seam courtyard corrosion and the corrosion of concentration cell are the same, but the corrosion of concentration cell has more obvious anode and cathode areas.
(2) Pitting corrosion: occurs in a relatively local area of the metal surface, causing caves or pits and expanding to the inside, or even perforation. If the diameter of the hole is smaller than the depth of the hole, it is called pitting. If the diameter of the hole is larger than the depth of the hole, it is called pitting. In fact, there is no strict boundary between pitting and pitting. Pitting corrosion is one of the destructive and hidden forms of corrosion. It often makes the pressure large-caliber seamless steel pipe perforate and leak when the quality loss is still small.
(3) All corrosion: All corrosion is also called uniform corrosion, which is basically the same degree of corrosion that large-diameter seamless steel pipes produce on a larger area. For example, the inner wall surface of large-diameter seamless steel pipes suffers all the corrosion of the medium, and the outer wall is exposed. (Or paint but all have failed) atmospheric corrosion, etc. The pressure large-caliber seamless steel pipe that suffered all the corrosion gradually became thinner in wall thickness and then was destroyed. However, the correspondingly uniform rot does not exist, and the thickness of the rupture is not the same. From an engineering point of view, total corrosion is not a threatening form of corrosion, because sufficient window size has been considered in the design, but uniform corrosion will cause the load-bearing capacity of large-diameter seamless steel pipes to decrease, which will lead to serious operating accidents.
(4) Crevice corrosion: Crevice corrosion occurs at or near the crevice. These gaps are formed due to the contact of the same or dissimilar metals, or the contact of metals and non-metallic materials. The extent of corrosion at the crevice is much greater than other areas on the metal surface. This corrosion is usually caused by the lack of oxygen in the crevice, the change of acidity in the crevice, and the accumulation of certain ions in the crevice. Crevice corrosion is a very common corrosion phenomenon. Crevice corrosion may occur in almost all metal materials. The silt, scale and impurities deposited on the flange connection surface, nut pressing surface, lap surface, weld pores, rust layer, and deposited on the metal surface will form crevices and cause crevice corrosion.
In industry, thick-walled steel pipes are mainly used to make some conveying pipes. Of course, it is widely used in the construction industry, such as stair handrails, window guards, railings, road partitions, etc. At present, many products are used Here comes the stainless steel pipes, such as bicycles, medical equipment, automobiles and so on. Thick-wall welded pipe products are not only rich in types, but also in terms of their processing technology and forming methods. In most cases, after forming, the next process is to expand the full-length diameter of the welded tube again to improve the quality of the welded tube. In other words, the diameter expansion process has become an important process in the quality of finished pipes in the production of thick-walled steel pipes.
Tips: ASTM A53 Grade B is more popular than other grades. API 5L Gr.B is an American standard material, A53 GR.B ERW refers to the electric resistance welded steel pipe of A53 GR.B; API 5L GR.B Welded refers to the material Welded steel pipe of API 5L GR.B.
These pipes can be bare pipes without any coating, or it may be Hot-Dipped or Zinc-Coated and manufactured by Welding or by a Seamless manufacturing process. In Oil and Gas, A53 grade pipes are used in the structural and non-critical applications.
Permanent Steel Manufacturing Co.,Ltd: https://www.permanentsteel.com
Address: #668,Lugu Avenue,Hi-Tech Industrial Development Zone,Changsha,China
Seamless steel pipe: https://www.permanentsteel.com/product/carbon-steel-pipe.html
ERW steel pipe: https://www.permanentsteel.com/productshow/erw-steel-pipe.html
ASTM A53 ERW pipe: https://www.permanentsteel.com/newsshow/astm-a53-grb-erw-steel-pipe-erw-steel-pipe-supplier.html
Permanent Steel Manufacturing Co.,Ltd have years of experience in manufacturing of carbon steel pipe, stainless steel tube, hollow section, pipe fittings.(Fluid Pipe/Boiler Tube/Fire Pipe/Line Pipe/Structure Tube)
As a factory,which specializing in the production, processing and sales of various steel pipes and pipe fittings size enterprises, headquartered in Hunan, the production base is located in Shandong and Tianjin. So far, the facility occupies more than 228,000 square feet under roof and includes two working mills and quality assurance chemical- and strength-testing laboratories on site and located on a 2,000-acre site with more than 60 acres under roof, is home to one of the world’s largest cupolas; and the Contiarc, the first-of-its-kind continuous arc furnace.
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