San-RamonDN25 
NaranjoIs JDG Do a good job in the following aspects to effectively improve the use of square tubes
Large diameter welded square pipe for low pressure fluid transmission, Standard No.: gbt14980-1994. Representative material: grade q235ab. It is mainly used to transport low-pressure fluids such as water, sewage, gas, air and heating steam.
Newark.Square tubes for low and medium pressure boilers (gb3087-199) are high-quality carbon structural steel hot-rolled and cold drawn (rolled) square tubes for superheated steam tubes, boiling water tubes for low and medium pressure boilers of various structures and superheated steam tubes, large smoke tubes, small smoke tubes and arch brick tubes for locomotive boilers. Square tubes for high-pressure boilers (gb5310-199 is a high-quality carbon steel, alloy steel and stainless heat-resistant steel square tube for the heating surface of water tube boilers with high pressure and above. High pressure square tube for chemical fertilizer equipment (GB 79-200 is a high-quality carbon structural steel and alloy steel square tube suitable for chemical equipment and pipelines with working temperature of - 40 ~ 400 ℃ and working pressure of 10 ~ 30mA.
The square tube will be tested in many aspects of its performance in the process. Each test is for the square tube to have a good performance in practical application. So what are the different properties of square tubes? Next,Newark20 hot dip galvanized square pipe, I'll introduce the characteristics of the lower tubes in terms of mechanical properties.
.Material classification: square pipe is divided into ordinary carbon steel square pipe and low alloy square pipe.
During the storage of square tubes, pay attention to the stacking layers of square tubes to avoid local stress at the tube end caused by too many layers, resulting in radial plastic deformation and layer damage of square tubes. It is recommended that the stacking layers of smooth pipes refer to apirp 5l1-2009 Recommended Practice for railway transportation of square pipes for pipelines or apirp 5lw-2009 Recommended Practice for ship and sea vessel transportation of square pipes for pipelines. It can also be determined by test or implemented according to the safe stacking height of square pipes. The stacking layers of pipes shall be implemented according to GBT 23257-2009 polyethylene layer of buried steel pipelines.
Square pipe is an important type of square pipe, which has great similarities with seamless steel pipe, but it is different. Square pipe is of great use in square pipe, which is generally used in the field of building materials and pipes. Today we tell you about the painting of square pipe. In fact, most manufacturers need to do this function, not only painting but also galvanizing. Zinc will precede others The base material of the square tube is corroded. If painting is not for you, it will cost you two money. If painting it is recommended that you brush the zinc rich primer, because you brush other paints, it will corrode quickly, and then continue to corrode your zinc coating, so as to achieve the top coat on the zinc rich primer. In fact, you should brush the zinc rich primer before galvanizing
When cutting, please fix it with square tubes such as vise, and then cut it after it is fixed.
During the pushing process of spot welding and repair welding elbows, there will be thinning, so manufacturers usually use thick spot pipes. If thin raw materials are used, the products produced must be unqualified. Generally,NewarkSquare galvanized steel pipe, there are about 40 wires thinned. If the technology is not good or the drawn pipe is used, the thickness is significantly lower than the standard.
The square tube shall be painted correctly. Professional square tube, square rectangular tube, seamless square tube galvanized square tube and galvanized square tube have stable, safe and reliable performance and can be maintenance free. The technical level has reached the domestic level and the advanced level of similar international products. Otherwise, the square tube will be corroded. The correct paint shall also be selected during painting, so as to ensure that the square tube can be used more firmly, So as to ensure that the square tube will be better and better in future use. The square tube is widely used in the soul. Each kind of square tube has different functions for the other tube. We choose the right way and different square tubes, which can increase the performance of the square tube and be applied to different fields. Let me briefly introduce the lower tube.
Focus on Development.After perforation, the round tube blank is successively rolled by cross rolling, continuous rolling or rolling. Take off the pipe after sizing. The conical drill bit of the sizing machine rotates into the steel embryo at high speed to form a steel pipe. The inner diameter of the steel pipe is determined by the outer diameter length of the sizing machine bit. After sizing the steel pipe enters the cooling tower for water spray cooling. After cooling, the steel pipe will be straightened. After straightening the steel pipe
Application: it is widely used in machinery, construction, metallurgy, agricultural vehicles, automobiles,Newark316L stainless steel square pipe, railways, highway guardrails, container frames, square tubes, raw materials, welding wires and fluxes. It must undergo strict physical and chemical inspection before being put into operation.
The great difference between the square pipe and the thin-walled steel pipe produced by the square pipe factory lies in the thickness of the steel pipe wall. Generally speaking, the thin-walled steel pipe is cold drawn technology, while the square pipe generally uses hot rolling technology. If it is distinguished by the unit of measurement, it is generally believed that the watershed between the square pipe and the thin-walled steel pipe is that the wall thickness diameter is equal to 0.02, and the thin-walled steel pipe is that the wall thickness diameter is less than 0.02, thin-walled steel pipes are mostly used in pipes. The square tube is mostly used in the blank of hollow parts. Used on pressure bearing and important pipelines.
The purpose of heat is to prevent the generation of cold cracks. Cold crack is directly related to carbon equivalent. Therefore, it is necessary to distinguish the carbon equivalent of the q355b square tube, and the carbon equivalent of the q355b square tube is the same. If the carbon equivalent of Q345 is less than 0.3%, it can be said that the weldability is OK. Generally speaking, the cold crack increases when the carbon equivalent is 0.4%.
The cheapest.The square tube is a low-alloy high-strength structural steel with carbon content of 0.1% - 0.25% and the main alloy elements manganese, silicon, vanadium, niobium and titanium are added; Its total alloy content is 3%. According to the strength, it is divided into four levels: 300, 350, 400 and 450MPa.
The other is designed with deformation angle, which can be regarded as 180 DEG from round tube to square tube; To 90 & deg; The bending deformation of angle, the distribution of deformation angle is usually larger at the beginning and middle passes and then gradually decreases. In the pass formed directly by arc intersection, the fillet part of the pipe blank cannot be filled with the pass, so the pass perimeter is different from that of the pipe blank. In order to ensure the dimensional accuracy, the fillet part of the pass needs to be corrected and calculated. Therefore, this method has higher design accuracy than other methods. However, due to the large amount of iterative calculation, this method is more suitable for pass design by computer. If you use a frame that deforms both horizontally and vertically, you can directly use the deformation angle & theta; Pass design.
The square tube can be sprayed with fluorocarbon paint, which needs some treatment before spraying.
Newark.In the test, place the sample between two parallel plates and press it evenly to the flattening distance h specified in relevant technical conditions with a press or testing machine at a speed of no more than 60mmin.
Strictly feed Si Ca wire quantity to ensure effective & Omega in steel; When (CA) is about 0.002%, the inclusions can be fully denatured without generating more high melting point inclusions.
When processing the square tube, some processes need to heat the seamless square tube. The heating operation in the processing of the seamless square tube plays a very key role in the quality of the finished seamless square tube.