LSAW Steel Pipe

　　Steel pipes without joints on the outer surface are made of a single piece of metal and are called seamless steel pipes. According to the manufacturing method, the seamless pipe is divided into a hot rolled pipe, a cold rolled pipe, a cold drawn pipe, an extruded pipe, a top pipe, and the like. According to the shape of the section, seamless steel pipes are divided into two types: circular and special shapes. 　　Shaped tubes have a variety of complex shapes such as squares, ovals, triangles, hexagons, melons, stars and wing tubes. The maximum diameter is 650mm and the minimum diameter is 0.3mm. Depending on the application, there are thick walled tubes and thin walled tubes. Seamless steel pipes are mainly used in petroleum geological drilling pipes, petrochemical cracking pipes, boiler pipes, casing pipes, automobiles, tractors, and high-precision structural steel pipes for aviation. 　　Classification: Seamless steel pipes along the perimeter of their cross section. According to d...

　　Heat treatment is a method of changing the physical properties of high pressure boiler pipe by heating and cooling. Heat treatment can improve the microstructure of high pressure boiler pipe, so as to meet the required physical requirements. Toughness, hardness and wear resistance are obtained by heat treatment. In order to obtain these characteristics, it is necessary to adopt quenching, annealing, tempering and surface hardening. 　 　a. Quenching 　　Hardening, also called quenching, is that high pressure boiler pipe is heated evenly to the appropriate temperature, then quickly immerse in water or oil for rapid cooling, and cooling in the air or in the freezing zone. So that the high pressure boiler pipe can obtain the required hardness. 　　b. Tempering 　　High pressure boiler pipe will become brittle after hardening. And the stress caused by quenching can make the high pressure boiler pipe tapped and broken. The tempering method can be used to eliminate brittleness. Although th...

　　The production characteristics of high-pressure boiler pipe 　　1. Tube. High surface quality requirements, the need for stripping, an amount of 5 mm strips, some plants take black grinding. 　　2. Tube cutting. Hard steel, the use of flame cutting or sawing. 　　3. Heating. Poor thermal conductivity, and therefore to control the furnace end temperature. The heating temperature is generally 1120 ~ 1180 ℃. 　　4. Rolling. Such steel is generally better performance perforation, deformation parameters can be selected carbon steel. 　　5. Rolling after heat treatment. Such pipe after rolling to normalizing and tempering. Air cooling after hot rolling and then take some factories in 730 ~ 740 ℃ tempering. 　　Higher steel tube geometry requirements in order to ensure a good counterpart welding, pipe length should be as long as possible, helps to reduce the number of welds. 　　 　　 Check www.tjxysteel.com for more info