Flanges are commonly used parts in some large pipeline projects, but because many people are very unfamiliar with such parts as flanges, they don't know what flanges are. So what exactly is a flange? Let's take a look!

Flanges, gaskets and fasteners are collectively referred to as flange joints. Flange joints are widely used parts in engineering and are indispensable components for piping design and piping installation valves. In application, flanges are not only frequently used in pipeline construction, but also have very important applications in industry, water supply and drainage systems, ventilation systems and automatic control systems.

The flat sealing surface is suitable for low pressure and non-toxic media. The sealing surface of the tongue and groove is suitable for explosive, flammable, toxic media and high pressure. A gasket is a ring that causes plastic deformation and has a certain material strength.

This may be more standard, but it is not well known. For example, when there is a long-distance piping, it is necessary to connect a part of the piping to the entire piping, install a valve on the piping, and observe the reflector, retractor, etc. It is welded by electric welding, but it cannot be disassembled for future maintenance. Therefore, many of these pipelines choose flange connections for future maintenance and replacement. The flange end is connected to the pipeline by welding or other methods. The two opposite flanges are fixed by fasteners (bolts) to form a complete pipeline. The valve is basically connected in this way.

Flange heat treatment process: after heating the metal, insulating and cooling, the properties of the metal are different. The performance of the same flange pipe is different after heating. For example, stainless steel obtained by heating and cooling flange pipes. The flange pipe has excellent performance, and the heating process of the stainless steel flange pipe is one of the important parameters in the heat treatment process.

In flange heat treatment, annealing cooling rate is usually slow, normalizing cooling rate is faster, and quenching cooling rate is faster. However, due to different types of steel, there are also different requirements. After the metal is heated, when the workpiece is exposed to the air, the flange metal parts are often oxidized. Decarburization has a great adverse effect on the surface properties of the heat-treated steel parts. The flange pipe metal must usually be in a controlled or protective atmosphere. The neutralization and vacuum heating of molten salt can also be protected by coating or packaging.

In addition, the heating temperature of the flange is one of the important process parameters in the heat treatment process. The selection and control of heating temperature is the main issue to ensure the quality of heat treatment. The heating temperature varies according to the metal material and the purpose of the heat treatment. The metal heat treatment of high-temperature flange pipes is usually heated to above the phase transition temperature. There are various heating methods. The earliest used carbon as the heat source and then used liquid and gas fuels. Now many manufacturers use electrical applications, which are easy to control and no environment. Pollution.