Baoding special square tube wholesale manufacturer
The billet of square tube is a necessary raw material for square tube consumption. When the bending degree exceeds the specification requirements, the billet of square tube is easy to cause the piercer to roll and jam, which is easy to form uneven wall thickness of perforated blank. It is necessary to strictly implement the billet acceptance system of square tube and the billet sawing system of square tube. It is necessary to timely inspect the necessary raw materials of the consumption square tube with the incoming materials and deal with the problems found in a timely manner, which will not only affect the normal perforation structure adjustment of the piercer, but also affect the dimensional accuracy of the entire square tube.
Baoding special square tube wholesale manufacturer
1. After hot rolling, non-metallic inclusions (mainly sulfides and oxides, as well as silicates) inside the steel are pressed into thin sheets, showing delamination (interlayering). Delamination greatly deteriorates the tensile properties of steel along the thickness direction, and may present interlaminar tearing when the weld shrinks. The partial strain induced by weld shrinkage often reaches several times of the strain at the yielding point, which is much larger than the strain caused by load; 2. Residual stress caused by uneven cooling. The residual stress is the internal self balanced stress without external force. Hot rolled section steel of various sections has this kind of residual stress. The larger the section size of ordinary section steel is, the greater the residual stress is. Although the residual stress is self equilibrated, it still affects the performance of steel members under external forces. For example, it may have adverse effects on deformation, stability, fatigue resistance, etc.
Baoding special square tube wholesale manufacturer
In order to understand the process law of direct squaring, it is necessary to understand the forming principle of bending. Both rectangular tube and round tube are formed by rolling, but there are great differences in the forming object, forming request and forming force between them. In order to understand the principle of direct squaring, the tube forming method is called bending; The forming method of rectangular tube is called bending. (Broadly speaking, bending is also bending. Bending and bending are distinguished here in order to understand that bending changes the curvature during tube forming and bending changes the angle during direct square forming.) Bending and bending are different. (1) Forming object The bending object of different round tubes is a line segment, and the bending object of square tubes is a point (in practice, the bending point of square tubes is a small area where the inner corner R is unfolded); (2) Different requirements for forming - the curvature of the line segment is changed when the circular tube is bent, and the included angle of the adjacent side is changed when the square tube is bent (3) The forming force is different - the forming force for bending is centripetal force, and the forming force for bending is bending moment.
Baoding special square tube wholesale manufacturer
1. Pay attention when customers choose square tubes! Choose the right square tube for your request. 2. Some anti-corrosion measures shall be taken for pipes during operation. 3. Do not overload when using. For example, only by weighing can you be overweight. 4. Do not weld or pull bridge wires on the pipe at will, which may cause damage and defects to the pipe. 5. It is important to pay attention to whether the pipes are intact and whether the quality meets the national standards when choosing to purchase. Can we disagree with your request.
Baoding special square tube wholesale manufacturer
The square tube detour is caused by improper adjustment of the rolling mill, residual stress during rolling and improper cooling along the tube section and length. Therefore, it is impossible to get very straight pipes directly from the rolling mill. Only after cold straightening the roundness of pipes can you satisfy the rules of technical conditions. The basic principle of straightening is to stop the elastic-plastic detour of the square tube from a large one to a small one, so it is necessary for the steel tube to be repeatedly detoured in the straightening machine. The level of steel pipe's repeated detour is mainly determined by the adjustment of the straightening machine. There are many factors that affect the straightening quality, such as the roundness of the original pipe, steel pipe size and data straightening model, adjustment parameters, etc.
Baoding special square tube wholesale manufacturer
1. Seamless square tube electrochemical coloring method: refers to the color of the film formed by electrochemical oxidation in a specific solution. 2. High temperature oxidation coloring method: immerse the workpiece in a specific molten salt and adhere to the corresponding process parameters, so that the profiled tube can form a certain thickness of oxide film and show various colors. 3. Chemical oxidation coloring method: refers to the color of the film formed by chemical oxidation in a specific solution, including salt method, mixed sodium salt method, sulfuration method, acid oxidation method and alkaline oxidation method. The common bacteriological method is widely used, but to ensure the color difference of a batch of products, reference electrodes must be used for control. 4. Gas phase cracking coloring method: it is relatively complex, and is rarely used in the industrial consumption of seamless square tubes. 5. Chemical method of ion stacking oxide coloring method: put the stainless steel seamless square tube in the vacuum coating machine to stop vacuum evaporation coating. This method is suitable for processing large quantities of products because of its large investment and high cost.
