The stainless steel tube is a hollow long strip of round steel, which is widely used in industrial transportation pipelines such as petroleum, chemical, medical, food, light industry, mechanical instrumentation, and mechanical structural components. In addition, when the bending and torsional strength are the same, the weight is light, so it is also widely used in the manufacture of mechanical parts and engineering structures stainless steel pipe supplier. Also used to produce a variety of conventional weapons, barrels, shells and so on.
Steels that are open at both ends and have a hollow section, and whose length is larger than the circumference of the section, are called steel pipes, and stainless steel pipes may also be called steel pipes. When the length is small compared to the perimeter of the section, it can be called a pipe section or a tubular fitting, which are all in the category of pipe products.
Stainless steel pipe is an economical section steel. It is an important product in the steel industry. It usually accounts for 8% to 16% of the total steel. It is widely used in the national economy. Because the steel pipe has a hollow section, it is most suitable as a conveying pipe for liquid, gas and solid. At the same time, compared with the same weight of round steel, the steel pipe has large section coefficient and high bending and torsional strength, so it also becomes various mechanical and architectural structures. Important material on it. Structures and components made of stainless steel have a larger cross-sectional modulus than solid parts at equal weight.
Therefore, the stainless steel pipe itself is a metal-saving economic section steel, which is an important part of high-efficiency steel, especially in the oil drilling, smelting and transportation industries, followed by geological drilling, chemical industry, construction industry, machinery. A large variety of steel pipes are also required for industrial, aircraft and automobile manufacturing as well as for boilers, medical devices, furniture and bicycle manufacturing. This year, with the development of new technologies such as atomic energy, rockets, missiles and aerospace industries, the role of stainless steel pipes in defense industry, science and technology and economic construction has become increasingly important.
1.Low-temperature processing — The martensite series stainless steel is quenched from the austenitizing temperature and then cooled to a very low temperature to promote the quenching method for producing martensite. Suitable for stainless steel that is easy to produce retained austenite.
2.Low temperature embrittlement — In low temperature environment, the deformation energy is small. In a low temperature environment, the phenomenon that the elongation and the reduction of the area are reduced is called low temperature embrittlement. It is mostly produced on the body-centered cubic structure of the ferrite series.
Stainless steel tubes undergo large changes in resistance, coefficient of linear expansion, thermal conductivity, mass hot melt, and magnetic properties at low temperatures. Resistance, linear expansion coefficient becomes smaller at low temperature; thermal conductivity and mass heat capacity decrease sharply at low temperature; Young’s modulus (longitudinal elastic modulus) increases simultaneously when temperature drops. Since the austenitic series stainless steel tube has a low temperature (Subzreo temperature) Ms point (martensitic transformation start temperature or martensite formation temperature), martensite can be formed while remaining below the Ms point. steel pipes manufacturer The formation of martensite at low temperatures makes SUS304 (18Cr-8Ni), a representative steel of austenitic stainless steel, non-magnetic at normal temperature and magnetic in low temperature environments.