30/07/2024
Heilongjiang Jianlong Corrosion-Resistant Line Pipe Family Adds a New Member
Recently, Heilongjiang Jianlong's first batch of more than 6,000 tons of X52NO corrosion-resistant line pipes was officially shipped to China Petroleum Technology Development Co., Ltd.
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When the content of alloy elements in the steel is uneven or the distribution of alloy elements is uneven, it will affect the chemical composition of the steel. If the carbon content in the steel is uneven or the distribution of other alloy elements is unbalanced, it will cause cracking at the end of the round steel.The causes of round steel cracks may include uneven heating temperature, too fast heating speed, and low rolling temperature.
Stainless steel industrial plate usually refers to the product obtained from the steel mill after hot rolling. The surface of this plate is relatively rough and not shiny, and it is often called No. 1 surface.Stainless steel 2B plate is a cold-rolled plate that has been further processed. On the basis of No. 1 plate, a series of processes such as cold rolling, annealing and pickling are used to make the surface of the plate present an appropriate glossiness, which is neither mirror nor completely matte, which is what we usually call 2B surface.The main difference between them:Surface glossiness:The surface of stainless steel industrial plate is relatively rough and matte, while stainless steel 2B plate is further processed, and the surface has a certain glossiness and is more beautiful. This is the most intuitive difference between the two.Toughness and flatness:Because 2B plate has undergone more processing and treatment, it performs better in toughness and surface flatness. This makes 2B plate more advantageous in some application scenarios with high requirements for material performance.Price:Stainless steel industrial plate has a shorter processing process and relatively lower cost, so the market price is more affordable. The 2B plate has undergone more processing and has a higher cost, so the price is relatively high.Thickness:The thickness range of stainless steel industrial plates is large and can usually be customized within a wide range. The thickness of 2B plates is relatively precise and is usually selected within a certain range.
From the production process point of view, galvanized square tubes can be divided into hot-dip galvanized square tubes and cold-dip galvanized square tubes. There are significant differences in the physical and chemical properties of these two types of galvanized square tubes, especially in terms of strength, toughness and mechanical properties.The production process of hot-dip galvanized square tubes includes welding after the steel plate or steel strip is curled and formed, and then the square tube is immersed in a hot-dip galvanizing pool and undergoes a series of chemical reactions. This production method is relatively simple, efficient, and has a variety of varieties and specifications, which makes it suitable for small galvanized square tube manufacturers. However, in terms of strength, hot-dip galvanized square tubes have lower strength than seamless square tubes.On the other hand, cold-dip galvanized square tubes use cold-dip galvanizing technology to give square tubes corrosion resistance. Unlike hot-dip galvanizing, cold-dip galvanizing coatings are mainly based on electrochemical principles for corrosion protection. Therefore, it is crucial to ensure that the zinc powder is in full contact with the steel to generate an electrode potential difference, which is the key link in the production of cold-dip galvanized square tubes.
Galvanized square tubes are divided into hot-dip galvanized square tubes and cold-dip galvanized square tubes according to the production process.
Hot-dip galvanized square tubes are square tubes that are plated with a layer of zinc on the outer surface of the square tube through the hot-dip galvanizing process. The hot-dip galvanizing process involves pickling the square tube to remove surface impurities and then immersing it in the molten zinc liquid in the galvanizing pool so that the zinc liquid fully reacts with the surface of the square tube, thereby forming a uniform galvanized layer on the square tube. Its anti-corrosion performance is significantly higher than that of cold-dip galvanized square tubes. The excellent anti-corrosion performance is due to the protection of the zinc layer, which can effectively isolate the square tube from the external environment, prevent corrosion, and ensure that the square tube can maintain a long service life and good durability in various environments.The galvanizing process of cold-dip galvanized square tubes is carried out at room temperature. This type of pipe not only has similar anti-corrosion performance to hot-dip galvanized square tubes, but also shows its unique advantages in many aspects. First of all, the production cost of cold-dip galvanized square tubes is relatively low, and the price is more competitive. Secondly, its coating is uniform and delicate, and its appearance quality is excellent, which can meet customers' requirements for beauty. The surface of cold-dip galvanized square tube is relatively smooth and bright. The electroplating layer using the white passivation process is bluish white or white, with a slightly colored luster in the sun.
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