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Five Technical Requirements for Flange Forging Process

The use conditions of flanges refer to the importance, working conditions, assembly and disassembly difficulty, complexity of them, as well as force, working temperature, corrosion degree, and other factors. From the basic principle that the forging is to serve and meet the use conditions of the parts, the technical requirements of the forging should include two aspects, one is the requirements of the shape, size and surface of the forgings, and the other is the requirements of structure and mechanical performance. The key to meeting the requirements of forgings is correctly selecting the raw materials, and strictly controlling the production […]

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What is an elbow?

What is an elbow? The steel elbow is a kind of connecting pipe commonly used in pipe installation. It connects two pipes with the same or different nominal diameters to make the pipe turn at a certain angle. According to the angle, there are three most commonly used 45° and 90°180°, and other abnormal angle elbows such as 60° are also included according to engineering needs . A bending radius of less than or equal to 1.5 times the diameter of the pipe belongs to the elbow, and 1.5 times larger than the pipe diameter belongs to theelbow . Elbows are made of cast iron, stainless steel, alloy steel, malleable […]

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Sealing form of forged valve and its sealing performance

Seals will also be a vital component in forged valves. The sealing performance of the forged valve means ability of the sealing parts of the cast valve to stop the leakage in the medium. It is an essential technical performance index in the forged valve. You can find three sealing elements of the cast valve: This is the contact between your sealing surfaces with the frequent lowering and raising member as well as the valve seat the joint with the packing together with the valve stem along with the stuffing box the text between your forged valve body and the […]

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Pressure test method and precautions for valves

In chemical production, as long as there is fluid, the valve will be used. The importance of the valve in the chemical industry is self-evident. So today, Yikong Jun will discuss with you the pressure test methods and precautions for common valves. Commonly used media for valve pressure test are water, oil, air, steam, nitrogen, etc. The pressure test methods for various industrial valves with pneumatic valves are as follows: 1 Shut-off valve and throttle valve For the strength test of the stop valve and the throttle valve, usually put the assembled valve in the pressure test frame, open the […]

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Experimental study on corrosion of ductile iron water supply pipe

The tap water corrosion of ductile cast iron for water-supply pipe (DCIWP) is studied by means of electrochemical method and mass loss method. Taking into account the effects of initial corrosion on the correctness of the experimental results, a mass loss test including a period of pre-corrosion is conducted to study the main influence factors for the corrosion process through the orthogonal test design. The result turns out that at first the corrosion rate of the iron fluctuates significantly, then declines gradually over time and becomes stable in 48 h finally. The influence of pH of the water and test […]

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Effect of post-forging heat treatment on stress corrosion behavior of nuclear ……

Effect of post solution- and stress relief-treatment on the stress corrosion cracking (SCC) resistance via U-bend specimens test in 42% boiling MgCl2 solution, as well as the microstructure, residual strain and mechanical properties of the forged 316LN stainless steel was studied. Results showed that the yield stress was reduced and the residual strain was eliminated through post solution-treatment for the forged steel. After immersion in boiling MgCl2 solution for 24, 48 and 72 h, respectively, all the U-bend specimens of either the solution-treated or the stress relief-treated steels suffered from clearly transgranular stress corrosion cracking (TGSCC). Furthermore, of which all the stress […]

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Development history of South Korea’s liquefied natural gas pipeline

Since 1962, South Korea has implemented four five-year economic development plans, so that the national economy embarked on the “take-off” road, in 1978, South Korea’s per capita GDP exceeded 1,000 U.S. dollars. However, after two oil crises, as an energy-poor country, the Korean government began to consider the diversification of energy use, so natural gas entered the Korean government’s vision, and went through three stages of development liquefied natural gas pipeline in South Korea. 1, The initial stage (1981-1990) In the extreme shortage of domestic energy, the Korean government’s economic authorities began planning LNG imports. In 1976, Korea Electric Power […]

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How to use the flange connection​ correctly

What is flange connection? Flange connection is to fix two pipes, pipe fittings or equipment on a flange, and between the two flanges, with flange pads, bolted together to complete the connection. . Some fittings and equipment have their own flanges and are also flanged. Flange connection is an important connection method for pipeline construction. The flange connection is easy to use and can withstand large pressures. In industrial pipes, in the home, the pipe diameter is small and low pressure, and the flange connection is not visible. If you are in a boiler room or production site, there are […]

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Pickling and Passivation of Steel Pipes

What Is Pickling & Passivation Pickling and passivation are two forms of chemical metal finishing that provide protective properties to metal especially against rust. Or in other terms, pickling and passivation are the name of the two processes where the metal is submerged in a bathing liquid that removes imperfections and rust from the surface of steel pipe. What Is The Difference Between Pickling & Passivation On the surface there does not seem to be a big difference between the two processes. The differences come down to the intensity of the treatments. Pickling uses acids that take off the surface […]

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Seamless Steel Pipe VS Welded Steel Pipe

As an important part of steel products, steel pipes are divided into two types: welded steel pipes and seamless steel tubes due to their different manufacturing processes and the shape of the pipes used. Seamless steel pipes are rarely used in the construction department, and most of them are steel pipes welded with steel plates, referred to as welded pipes. Scaffolding steel pipe is a straight welded pipe. (1) Welded steel pipe The blanks used for welded steel pipes are steel plates or strip steels, which are divided into furnace welded pipes, electric welding (resistance welded) pipes and automatic arc […]

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