Bending process can be divided into many kinds, mainly stretch bending, bending, push bending and other ways, these methods can be divided into cold bending and hot bending two kinds of bending state. The processing technology used for different elbows is different, and the characteristics of different elbows are also different.

Medium frequency bend:

The intermediate frequency elbow is used to connect two pipes with the same nominal diameter to make the pipe turn 90 degrees.

In addition to carbon, medium frequency elbow generally contains a small amount of silicon, manganese, sulfur and phosphorus. According to the use, carbon steel can be divided into three types: carbon structural steel, carbon tool steel and free-cutting structural steel.

According to smelting method, it can be divided into open-hearth steel, converter steel and furnace steel; according to deoxidation method, it can be divided into fluidized steel, killed steel, semi-killed steel and special killed steel; according to carbon content, carbon steel can be divided into low-carbon steel, medium-carbon steel and high-carbon steel; according to phosphorus and sulfur content, carbon steel can be divided into ordinary carbon steel, high-quality carbon steel and high-quality steel. Steel and premium grade steel.

In general carbon steel, the higher the carbon content, the greater the hardness, the higher the strength, but the lower plasticity. Mainly refers to the mechanical properties of steel depends on the carbon content, and generally do not add a large number of alloy elements of steel, sometimes also known as plain carbon steel or carbon steel.

The forming process of intermediate frequency elbow is complex. It needs to be welded according to different materials and uses, and gradually formed under certain pressure. The forming of intermediate frequency elbow should be carried out according to a certain process, and the corresponding process should be strictly followed. Otherwise, the quality problems will occur when the intermediate frequency elbow is produced.

Medium frequency bending pipe has high viscosity and poor chip breaking performance, so it is easy to scratch the workpiece thread or break the edge of the tap in the process of tapping stainless steel medium frequency bending pipe, which affects the processing efficiency and thread quality. Medium frequency bending pipe can be divided into: carbon steel medium frequency bending pipe, stainless steel medium frequency bending pipe, alloy steel medium frequency bending pipe; according to the standard can be divided into: national standard medium frequency bending pipe, non-standard medium frequency bending pipe, international standards: German standard, Japanese standard, American standard, British standard medium frequency bending pipe. Now let's learn about the medium frequency bend of carbon steel.

Medium frequency bend is widely used in China's industry. Medium frequency bending pipe is made according to the long-term production. In the course of many failures, it is concluded that reasonable and scientific new experience should be gained and a certain amount of rare earth elements should be added to improve the alloy quality of steel. In electric power, mining, metallurgy and other industries, materials are conveyed and exported by short distance and high pressure. The pipeline bears considerable pressure and is subjected to very serious wear and tear. It is difficult for a single material pipeline to meet the requirements of this working condition.

Medium frequency bending pipe is a heating ring on the steel pipe, around 15 mm from the steel pipe gap, outside slightly + 2 mm, inside slightly - 2 mm. The heating width of phi 800 x 30 is about 55mm, and the heating width of phi 1200 x 30 is about 60mm. In the process of bending, 8 Mpa strong wind cooling is used to cool down the temperature so that the specified heating width is kept at about 850 degrees when bending, so that the roundness part of the pipe cooled at both ends is supported, so that the bending part is always carried out in a narrow width, so that the roundness of the pipe after bending is not changed or little deformation is achieved. The effect.

Medium frequency bending pipe is mainly used for heating straight seam pipe and seamless steel pipe. After heating by medium frequency, the effect can be achieved before production.

Medium frequency induction heating elbow is an advanced elbow method. However, if the bending process is not proper, the phenomenon of loose metal damage may occur. This kind of damage is a kind of fine grain boundary crack, which has a certain adverse effect on the mechanical properties and service life of the pipe. The narrow heating range, uneven temperature inside and outside the tube wall, and sudden cooling and sudden heating of the tube during the bending process are its inherent weaknesses.