Suzhou Special Square Tube Manufacturing Factory Wholesale and Wholesale Manufacturers
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.
Suzhou Special Square Tube Manufacturing Factory Wholesale and Wholesale Manufacturers
Square pipes are divided into plain carbon steel square pipes and low-alloy square pipes according to their materials. 1. Ordinary carbon steel is divided into Q195, Q215, Q235, SS400, 20 # steel, 45 # steel, etc. 2. Low alloy steels include Q345, 16Mn, Q390, ST52-3, etc. According to consumption specifications, the square tube can be divided into: 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. The square tubes are classified according to the section shape: 1. Simple section square tubes: square square tubes, rectangular square tubes. 2. Complex cross-section square tube: flower shaped square tube, tooth shaped square tube, corrugated square tube, special-shaped square tube. Square tubes are divided into hot-dip galvanized square tubes, electrogalvanized square tubes, oiled square tubes and pickled square tubes according to their appearance. Square pipes are classified according to their uses: square pipes for decoration, machine tool equipment, machinery industry, chemical industry, steel structure, shipbuilding, automobile, steel beam and column, and special pipes. Square and rectangular tubes are classified according to wall thickness: extra thick square and rectangular tubes, thick square and rectangular tubes and thin-walled square and rectangular tubes.
Suzhou Special Square Tube Manufacturing Factory Wholesale and Wholesale Manufacturers
Most people think that stainless steel will not rust, and the rusty is not stainless steel. In fact, some stainless steel materials with low nickel content will rust under corresponding conditions. The stainless steel rectangular tube has the ability of resisting atmospheric oxidation and corrosion in the medium containing acid, alkali and salt. However, the corrosion resistance of steel varies with its chemical composition, additive state, application conditions and environmental medium type. Therefore, not any kind of stainless steel can resist corrosion and rust in any environment. Stainless steel forms a thin, solid and stable chromium rich oxide film on its surface to prevent oxygen atoms from penetrating the oxide layer and obtain corrosion resistance. If the membrane is damaged, the stainless steel rectangular tube will lose its rust resistance ability. There are four common destruction modes in daily life: (1) Under the condition of water and oxygen, the surface of stainless steel square tube forms organic acid, which will corrode the metal surface for a long time. (2) When encountering condensed water in the polluted air, it will form sulfuric acid, nitric acid, acetic acid and other liquid points to form chemical corrosion. (3) There is dust containing other metal elements or attachments of dissimilar metal particles on the surface of stainless steel rectangular tube. In humid air, the condensation water between the attachment and the stainless steel connects them to form a micro battery, causing electrochemical reaction and destroying the maintenance film, which is called electrochemical corrosion. (4) The stainless steel rectangular tube has acid, alkali and salt on its surface, causing partial corrosion.
Suzhou Special Square Tube Manufacturing Factory Wholesale and Wholesale Manufacturers
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.
Suzhou Special Square Tube Manufacturing Factory Wholesale and Wholesale Manufacturers
1. With a thick and dense pure zinc layer covering the steel surface, it can prevent the steel matrix from contacting with any corrosion solution, and maintain the steel matrix from corrosion. In ordinary atmosphere, the surface of square tube forms a thin and dense layer. It is difficult to dissolve in water, so it plays a role in maintaining the steel matrix. If insoluble zinc salt is generated with other components in the atmosphere, the square tube has a better anti-corrosion effect; 2. It has an iron zinc alloy layer, which is dense in separation, and has special corrosion resistance in marine salt fog atmosphere and industrial atmosphere; 3. The square tube has strong wear resistance due to its solid separation and mutual solubility of zinc and iron; 4. Because zinc has good ductility and its alloy layer is firmly attached to the steel base, the square tube can stop cold punching, rolling, wire drawing, bending and other molding without damaging the coating; 5. After hot-dip galvanizing of steel structures, it is equivalent to one annealing treatment, which can effectively improve the mechanical properties of steel matrix, eliminate the stress of steel parts during forming and welding, and is conducive to stopping turning of steel structures; 6. The surface of the heat square tube is bright and beautiful; 7. Pure zinc coating is a plastic zinc coating in hot galvanizing. Its properties are basically similar to pure zinc, and it has ductility, so it is flexible.
Suzhou Special Square Tube Manufacturing Factory Wholesale and Wholesale Manufacturers
Wall thickness grading of rectangular pipes - extra thick rectangular pipes, thick rectangular pipes, thin rectangular pipes. The thick wall rectangular pipe is a galvanized welded square pipe used for low pressure fluid escort, which is only used for ordinary low pressure fluid, mainly used for water, gas, oil, hot water or steam escort; Galvanized welded thick wall rectangular pipe for low pressure escort is mainly used to escort ordinary low pressure fluids such as water, gas, oil, hot water or steam. The surface of the square pipe adopts hot galvanizing or cold galvanizing anti-corrosion process. The rectangular thick wall mining infusion welding square tube is mainly used for mining air pressure welding, row welding, shaft drop welding, etc.
