Yangzhou special rectangular tube manufacturer wholesale direct wholesale manufacturer
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.
Yangzhou special rectangular tube manufacturer wholesale direct wholesale manufacturer
The quality of seamless square tube is better and the price is more expensive. The welded square tube is welded by bending the plate. There is high temperature in the welding process, which will affect the metal structure, and its mechanical properties are not as stable as seamless steel tubes. Welded square tube is a hollow square section steel square tube, also known as hollow cold-formed steel. It is a square section steel with overall dimensions made of hot rolled or cold-rolled strip steel or coil steel by high-frequency welding after cold bending and forming. In addition to the thickening of the wall thickness, the size of the corner and the straightness of the edge of the seamless square tube have reached the extent that they exceed the resistance welded cold formed square tube. The size of the R corner is generally between 2 and 3 times of the wall thickness. It can also consume R corner square tubes of the size required by customers according to their needs. Seamless square tube is a kind of long steel with hollow section and no seams around. It is a square tube formed by extrusion of seamless tube through four sides of the mold. The square tube has a hollow section and is widely used as a pipeline to escort fluid. It is mainly used in liquid escort, hydraulic support, mechanical structure, medium and low pressure and high pressure boiler tubes, heat exchange tubes, gas, oil and other industries. It is more stable than welding and will not show cracks.
Yangzhou special rectangular tube manufacturer wholesale direct wholesale manufacturer
The construction process of square tube is relatively simple. If the square tube consumer manufacturer needs to add another process after using the round tube for construction, that is to change the cross section of the round tube to square, and the cross section of the square tube is square originally, so this process can be omitted, and the construction will be easier to stop. Analysis of seismic resistance and bearing capacity of square tube. After repeated experiments on square tubes and round tubes by square tube consumer manufacturers, it is found that square tubes can accept greater pressure and vibration than round tubes, which illustrates that the use of square tubes can improve the quality of buildings, so it is natural to choose square tubes.
Yangzhou special rectangular tube manufacturer wholesale direct wholesale manufacturer
1. Solid bending: solid bending, which literally means that the bending is compacted, and the inner and outer rollers and the inner and outer walls of the tube blank are compacted in both directions during solid bending. 1) The advantage of real bending is small elasticity, accurate forming, and only accurate roll shape is required. The R of internal angle forming is relatively accurate. 2) The defect of real bending is tensile/thinning effect. 1、 The actual bending will produce tension at the bend, and the tensile effect will shorten the longitudinal length of the bending line; 2、 The metal at the solid bend will become thinner due to stretching. 2. Empty bending: empty bending is the bending moment formed by the one-way contact between the outer roll and the outer wall of the tube blank to bend the strip. Empty bending will cause the bending line to shrink, and the shrink effect will make the bending line longitudinally extend, and the metal at the bend will appear to accumulate and thicken, which is the shrink/thicken effect of empty bending. 1) The advantage of empty bending is that it can stop the bending of side length when the real bending cannot be stopped, such as the synchronous bending and finishing of the upper/side edges of square and rectangular tubes. Empty bending can also bend the inner corner with R<0.2t without breaking the pipe wall. 2) The defect of empty bending is that when the upper side/side side are synchronously empty bending, because the upper roll and the lower roll produce pressure at the same time, the forming force is easy to exceed the critical point, forming the edge instability concave, and also will affect the stable operation of the unit and the forming quality. This is also the different characteristics of square and round tubes during empty bending.
Yangzhou special rectangular tube manufacturer wholesale direct wholesale manufacturer
1. Fake rectangular tubes are easy to fold. 2. The surface of fake and inferior rectangular tubes is often pitted. 3. The appearance of fake and inferior rectangular tubes is easy to produce scars. 4. The appearance of fake and inferior materials is easy to crack. 5. Fake rectangular tubes are easy to scratch. 6. The fake and inferior rectangular tube has no metallic luster and is light red. 7. The transverse reinforcement of fake and inferior rectangular tubes is thin and low, which often shows the phenomenon of being insufficient. 8. The cross section of the fake rectangular tube is oval. 9. The composition of steel is average, the tonnage of the cold shear is high, and the end face of the cutting head is smooth and uniform. 10. The material of fake and inferior rectangular tubes contains many impurities, and the density of steel is relatively small. 11. The inner diameter of fake and inferior rectangular tubes fluctuates greatly. 12. The trademark and printing of the tube are relatively standard. 13. The spacing of rectangular pipes with a diameter of more than 16 is more than IM. 14. The longitudinal reinforcement of deformed steel bars made of fake and inferior steel is often wavy.
Yangzhou special rectangular tube manufacturer wholesale direct wholesale manufacturer
The square tube is a square tube type. Many materials can form a square tube. It is used in, for, and where. Most square tubes are made of steel tubes, mostly for construction, decoration, and construction. Square pipe (Fangtong) is a kind of square pipe, that is, steel pipes with equal side lengths. It is rolled from strip steel after processing. Generally, the strip steel is unpacked, leveled, curled and welded to form a round pipe, which is then rolled into a square pipe and cut to the required length. Usually 50 pieces per pack. Square tube (Fangtong) is also called rectangular tube, and the algorithm is (a+a) * 2/3.14 or (a+b) * 2/3.14
