After cold drawing and aging treatment, the yield point is improved, the tensile ultimate strength is also increased, and the plasticity continues to decrease. Due to the reduction of internal stress during aging, the modulus can be basically restored. According to this principle, cold drawing or cold drawing of reinforcement or low carbon steel wire rod is often carried out on site or prefabricated component factory, so as to improve yield strength and save steel.The principle is similar to that of the plate rolling machine. The bending machine can determine a circle. Adjust the height to adjust the curvature.Sao Paulo,Large fillet radius, insufficient blank holder area, easy to produce unstable wrinkles; If the fillet is too small,Sao PauloHow much is a galvanized pipe, the resistance of the material into the die will increase in the deformation process, and the material is not easy to move and transfer inward, thus increasing the large tensile stress in the force transfer area, which may lead to tensile cracking.Stage ( & mdash; )Billund Lufthavn,Hardness hardness is a pointer to measure the hardness and softness of metal materials. At present, the hardness method is commonly used to measure the hardness in production. It uses the indenter with fixed geometry to measure the hardness value of the metal material surface tested under fixed load according to the degree of hardness.Fatigue strength, plasticity and hardness discussed above are indicators of the mechanical properties of metals under static load. In fact, under which fatigue will occur.There are many ways of ignition, such as arc, electric spark, flame, strong current, high-temperature furnace, electron beam, laser, high-temperature radiation, microwave, chemical furnace, etc.

Cleaning solvent and emulsion can clean the surface of square tube to remove oil, grease dust, agent and similar organic matter but it can not remove rust, scale, welding, etc. on the surface of square tube, so it is only used as an auxiliary means in production.The purity of the square tube has a great impact on the isotropic performance of the square tube. The use of secondary refining technology (including vacuum refining, ESR and ladle powder spraying) can improve the purity of the square tube, especially reduce the content of harmful impurities in the square tube, which is beneficial to improve the performance.Square tube production most square tube processing is square tube pressure processing, resulting in plastic deformation of the processed steel (billet, etc.). According to the square tube processing temperature, the square tube can be divided into cold processing and hot processing. The main processing of square tube includes: rolling: the gap (various shapes) between the square tube metal blank and the rotating roll , because of the compression of the roll,Sao PauloWhere does galvanized square tube sell, the material section is reduced and the length is increased. This is a common production method for producing square tubes. It is mainly used to produce square tube profiles,Large diameter qb square tube production standard classification square tube is divided according to production standard: national standard square tube, Japanese standard square tube, British standard square tube, American standard square tube, European standard square tube and non-standard square tube.Main uses of square tube: square tube is mainly used in tap water engineering, petrochemical industry, chemical industry, electric power industry agricultural irrigation and urban construction. It is one of the key products developed.Square tube is a very good steel in economic construction. There are many kinds and principles of cold drawing. You may still have a lot of insufficient understanding of the cold drawing principle of each other's pipe. Next, I'll lead you to learn its cold drawing principle.

For gas transmission: gas steam and liquefied petroleum gas.Installation works,Solution treatment and nondestructive testing sand rolling treatment and sand blasting treatment many manufacturers in the market do not do solution treatment and % penetration nondestructive testing, and many of them use sand blasting instead of sand rolling. After these steps are omitted, the cost is greatly reduced.There are many forms of heating furnace, but the ring heating furnace is mainly used. The heating furnace has an annular furnace bottom,Sao PauloGalvanized square pipe 140, which can rotate slowly, the blank is loaded along the diameter direction of the furnace bottom from the inlet, and can be heated and homogenized to the specified temperature when it is used at the outlet. The production process of seamless square tube is relatively slow, and the heating operation especially needs patience. Because if the heating operation is not standardized, cracks, folding and eccentricity on the inner or outer surface of the tube blank will only produce waste products and defective products.Generally speaking, pressurization and thermal insulation.Sao Paulo,With the progress of the times and the development of science and technology, the application fields of square tubes are widely divided. The main fields are the construction industry. Affected by the environment and weather, square tubes will also rust for a long time. How to improve the rust resistance of square tubes and what are its rust resistance? Let me give you a detailed introduction below.The difference between square pipe and seamless steel pipe the main feature of seamless steel pipe is no welding joint and can withstand large pressure. The product can be very rough as cast or cold drawn parts.There are many processing technologies for square tubes. I won't introduce the specific processing technology here. We only know about the processing technology of each other's tubes. We may have insufficient understanding of its heating technology. Next, I'll give you a detailed introduction to the heating technology of the lower tubes.