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Inspection and maintenance of pressure pipeline

When you step into the industrial zone, you will find pressure pipes everywhere. Some of them even smoke. You always feel that they are about to explode at any time. But that’s the truth. Maybe it will explode. If you look at some pictures, you’ll understand. These are the tragedies caused by improper operation or routine inspection. Therefore, it is very important to master the daily inspection items and preventive measures of pressure pipeline accidents. Characteristics of pressure pipeline The so-called pressure pipeline refers to the use of pressure to transport gas, liquid, etc. But not all pipes can be […]

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Cause analysis and improvement measures of cracks in extra large bearing sleev……

Cracks were found in the non-destructive testing process of a super large bearing sleeve after grinding, which led to the failure of normal production. The bearing sleeve is made of GCr15SiMn steel with outer diameter of 800mm and height of 80mm. The processing procedure is: raw material inspection → sawing → forging → spheroidizing annealing → turning → heat treatment → grinding → magnetic particle testing → assembly. In this paper, through the use of macro examination, metallographic examination and other analysis methods, from the bearing sleeve material quality and heat treatment quality of bearing sleeve crack comprehensive detection and […]

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How to choose the right sulfuric acid resistant material

Because of the strong corrosiveness of sulfuric acid, the equipment for producing and using sulfuric acid has caused serious corrosion. In order to prevent or reduce this corrosion and ensure the smooth production, the materials of various sulfuric acid equipment must be selected and used reasonably according to the corrosion characteristics of sulfuric acid and the corrosion resistance of various materials. Corrosion characteristics of sulfuric acid Sulfuric acid is mainly produced by contact method and lead chamber method. Sulfur or sulfide, such as copper sulfide, is burned to form sulfur dioxide. Under the action of oxygen and catalyst, sulfur dioxide […]

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Influence of pipeline resistance on lift and calculation of pipeline loss

As we all know, the pipeline system is a kind of solid matter, and water is easy to flow. If the water in the pipeline is flowing, there must be a part of energy converted into heat energy and “eliminated”, that is, a part of water pressure (or head) is lost. This is the reflection of objective things and the inevitable law of water flow movement. Usually, we call this phenomenon of energy conversion energy loss (or hydraulic loss, head loss). It is measured in meters. What is the effect of pipe resistance on lift? Some users have measured that […]

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How to pickling and passivation stainless steel

Principle of pickling and passivation The corrosion resistance of stainless steel is mainly due to the addition of high content of Cr element (such as 316L w (CR) = 16.00 ~ 18.00) in the steel. Cr element is easy to oxidize and can rapidly form a dense Cr2O3 oxide film on the surface of the steel, which makes the electrode potential and corrosion resistance of the steel increase abruptly in the oxidation medium, The corrosion resistance of stainless steel mainly depends on the very thin (about 1nm) dense passivation film covered on the surface, which is isolated from the corrosive […]

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Processing technology of aluminum products

What is aluminum? Aluminum is the most widely used non-ferrous metal material, and its application scope is expanding. There are more than 700000 kinds of aluminum products produced by using aluminum materials. There are different demands in all walks of life, from the construction and decoration industry to the transportation industry and aerospace industry. Today, I’d like to introduce the processing technology of aluminum products and how to avoid deformation. The advantages and characteristics of aluminum are as follows: 1. Low density. The density of aluminum is about 2.7g/cm3. Its density is only one third of that of iron or […]

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What is valve cavitation

What is valve cavitation? Just as there can be negative effects of sound on the human body, certain frequencies can play a serious damage to industrial equipment. When the control valve is properly selected, there is an increased risk of cavitation, which will lead to high noise and vibration levels, resulting in very rapid damage to the valve’s internal and downstream piping. In addition, high noise levels usually cause vibration and may damage pipes, instruments and other equipment. With the passage of time, the parts of the valve are degraded, and the cavitation caused by the valve is easy to […]

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The annealing process is so simple

Today we will talk about the annealing process, the classification of annealing methods, and the selection of methods. Annealing process The heat treatment process of heating metal or alloy to appropriate temperature, holding for a certain period of time, and then slowly cooling (generally with furnace cooling) is called annealing. The essence of annealing is to heat the steel to austenite and then carry out pearlite transformation. The structure after annealing is close to the equilibrium structure. The purpose of annealing: (1) The hardness of the steel is reduced and the plasticity is improved, which is convenient for machining and […]

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Global stainless steel and raw material market outlook in 2021 and the future

Current situation of world stainless steel industry In 2020, the global crude stainless steel output will be 53.13 million tons, and the steel output will be 45.25 million tons. According to the shape of products, it can be divided into plate and long material. Among them, stainless steel plate products are about 38 million tons (accounting for 84%), and long material products are about 7 million tons (accounting for 16%). According to the characteristics of products, it can be divided into three categories: conventional products, value-added products and high value-added products. Among them, customers choose suppliers according to the price […]

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Determination and elimination of white spots in forging steel

The “white spot” in forging is a common product of metallurgy and forging. This defect is found in the forging produced in the smelting of materials. The white spot is distributed in the center of forging in group form, which is very harmful to forging. How to accurately determine “white point” in forging and take appropriate post forging heat treatment process to eliminate this defect is the forging enterprise’s production in forging Important quality assurance measures in production. White spot is a common dense defect in forgings. How to correctly determine the “white spot” of forgings by ultrasonic flaw detection […]

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