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Why is heat treatment required for machining?

This is a very good question, which is a relatively confusing problem for many newcomers to the industry, but also many people with considerable experience in the industry did not think deeply about the problem, today here is a unified science. Mechanical processing heat treatment requirements is actually a technical requirement of the design process, if you are a mechanical structure design engineer, you need to have the cognitive ability in this regard, if you do not have such awareness, then you are not a qualified design engineer, at least not a very comprehensive design engineer. The cognition of heat […]

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Cause analysis of black belt defect of 316L forged flange

In the article, the problem of “black band” with strong magnetism and easy rusting on the surface of 316L forged flange was found by using macroscopic inspection, chemical analysis, metallographic analysis and scanning electron microscope analysis, etc. to find the cause of strong local magnetism and easy rusting of 316L forged flange. The black belt part and the parent material boundary is clear, and the metallographic organization of the black belt part is ferrite, Fe element is more than 90%, judged to be the involvement of foreign metal. Through the analysis of the actual production conditions, 316L forged flange “strip-like […]

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How to make high pressure pipe fittings

What are high-pressure pipe fittings? High-pressure pipe fittings are a type of plumbing fitting that joins multiple pipes together. Unlike standard plumbing fittings, high-pressure pipe fittings can withstand the pressure of compressed gases or liquids. To manufacture high-pressure pipe fittings, an alloy called stainless steel is used. Stainless steel is commonly used for these types of fittings because of its strength and durability, as well as its antimicrobial properties. To make high-pressure pipe fittings, a metal rod called stock is first heated in a furnace to ensure that it melts. Each fitting needs to be formed individually, so each metal rod […]

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Design principle of strength of gas transmission pipeline trunk line

The selection of wall thickness of large-diameter and high-pressure natural gas pipelines not only affects the safe operation of pipelines, but also is directly related to the investment in pipeline construction. The design concept, scope of application and technical advantages of each standard are analyzed by comparing the relevant contents of domestic and foreign standards for the strength design of straight sections of gas pipeline trunk lines such as GB 50251-2015, ASME B31.8-2007, ГОСТР 55989-2014, ISO 13623-2009 and CSAZ 662-11-2011, In particular, the differences in the design results of pipeline wall thickness between the standards are compared and analyzed with […]

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Forming technology of metal bend

Bends are widely used in metal pipelines. There are many forming methods for bends, including groove wheel rolling method, induction heating simmering method, mold pressing method, step-by-step forming method and numerical control bending method. Bends are also made of many materials, including ferrous metals and non-ferrous metals, including carbon steel, alloy steel, stainless steel, copper, aluminum, titanium, zirconium, nickel and their alloys. Different forming methods can be adopted for bends of different materials, specifications and batches according to their processability, price and processing cost. This paper introduces various forming methods and forming principles of metal bends, and compares their advantages […]

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Analysis of horizontal directional drilling construction technology for oil pi……

With the development of science and technology, horizontal directional drilling technology also has rapid development, in terms of the actual situation, this paper takes horizontal directional drilling construction technology as the background of the study, and also makes a scientific analysis of its principle, and then summarizes the characteristics of horizontal directional drilling construction technology for oil pipelines, to provide some reference for the application of horizontal directional drilling construction technology in oil pipelines. 1. The working principle and introduction of horizontal directional drilling The principle of horizontal directional drilling is to guide and detect the measured area with the […]

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Pipe Flanges And How Do They Work?

What is a flange? A flange is a method of connecting pipes, valves, pumps and other equipment to form a piping system. It also provides easy access for cleaning, inspection or modification. Flanges are usually welded or screwed. Flanged joints are made by bolting together two flanges with a gasket between them to provide a seal. flanges are the second most used joining method after welding. Using flanges adds flexibility when maintaining piping systems by allowing for easier disassembly and improved access to system components. In most cases, there are specific gasket and bolting materials made from the same, or approved materials as the piping components you […]

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What are the Chinese design standards for heat exchanger tubesheet?

The tube plate is one of the main parts of the shell and tube heat exchanger. The reasonable design of the tube plate is important for the correct selection and saving of materials, reducing the difficulties of processing and manufacturing processes, reducing costs and ensuring safety in use. Therefore, the strength of the tube plate must be properly analyzed to reasonably determine the thickness of the tube plate. GB151 “heat exchanger” for the design and manufacture of shell and tube heat exchangers, inspection and acceptance of a set of technical requirements must be followed. As a whole, the heat exchanger […]

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What is quenching bending?

1. Why does quenching bending occur? Quenching bending occurs during heating and quenching cooling. Sagging bending occurs during heating, and the reason for bending during cooling is uneven cooling. The faster the cooling speed is, the easier it is to make the cooling uneven. Therefore, the water cooling is most prone to quenching bending, and then gradually reduce according to the order of oil, hot bath and air (cooling). If the cooling is uneven, the side of the rapid cooling initially becomes concave, and when the whole part is cooled, it reverses to become convex. In addition, the use of […]

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Cause analysis of surface defects of 316L stainless steel cold rolled plate

Aiming at the linear defects on the surface of 316L stainless steel cold rolled plate, the chemical composition analysis, metallographic analysis, scanning electron microscope and energy spectrum detection of continuous casting billet, hot rolled black coil and cold rolled plate were analyzed. The results show that the surface of 316L stainless steel continuous casting billet with defects has deep vibration marks, pits and microcracks; There are linear defects on the surface of hot rolled plate, and there is a large area of oxidation area near the defects; No inclusions with large size were found at the defects of cold rolled […]

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