What is metal powder? Metal powder refers to a group of metal particles with a size of less than 1 mm. Including single metal powder, alloy powder and some refractory compound powder with metallic properties, it is the main raw material of powder metallurgy. Metal element is generally silve ...

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What is yield strength? The yield strength is the yield limit when the metal material yields, that is, the stress that resists minor plastic deformation. For metal materials that have no obvious yield phenomenon, the stress value that produces 0.2% residual deformation is specified as its yiel ...

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While browsing the website today, someone was asking: “How much strength below zero is affected by the steel structure?” Now let’s study this issue. The obvious decrease in the strength of steel structure in low temperature environment is actually the occurrence of cold brittlen ...

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Material surface treatment is a process of artificially forming a surface layer on the surface of the base material that is different from the mechanical, physical and chemical properties of the base. The purpose of surface treatment is to meet the product’s corrosion resistance, wear resista ...

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Steel is actually a combination of two terms-“steel” and “iron”. Ironmaking must be done before steelmaking. Iron is divided into pig iron and wrought iron. The carbon content of steel is between pig iron and wrought iron. Pig iron: Generally refers to an alloy of iron w ...

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Although the small bolt is not impressive, but it is used as a series of automotive key parts of the fastener, once the corrosion fracture failure, light car failure, heavy casualties. This year, there have been many accidents at Tesla, and one after another global recalls. According to the ...

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Globe valve, also known as shut-off valve, belongs to the forced sealing valve, is a kind of cut-off valve. According to the connection mode, it can be divided into three types: flange connection, screw connection and welding connection. The flow direction of the stop valve is from top to bottom, ...

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In the fluid pipeline system, the valve is the control element, its main function is to isolate the equipment and piping system, regulate the flow, prevent backflow, regulate and discharge pressure. It can be used to control the flow of air, water, steam, corrosive media, mud, oil, liquid metal a ...

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Maintenance and overhaul The pressure vessel is generally composed of six parts: cylinder, head, flange, sealing element, opening and connection pipe, and support. In addition, it is also equipped with safety devices, meters and internal parts for different production processes. Pressu ...

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Part I basic knowledge Chapter 1. measurement There are two main measurement units of length in the world today. One is the metric system. The measurement units are meter (m), centimeter (CM) and millimeter (mm). They are widely used in Europe, China, Japan and other Southeast Asia ...

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First of all, understand the bolts, and briefly introduce the following bolts: Mechanical parts, cylindrical threaded fasteners with nuts. A kind of fastener composed of head and screw (cylinder with external thread), which is used to connect two parts with through-hole by matching with nut. ...

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Bluing (blackening) principle In order to improve the anti rust ability of steel parts, the surface of steel parts is oxidized to dense and smooth ferric oxide (Fe3O4) with strong oxidant. The Fe3O4 thin layer can effectively protect the steel parts from oxidation. Fe3O4 oxidized at hig ...

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