ERW Steel Pipe

　　Butt weld elbow is formed by hot forming or forging forming elbow, and its connection is the form of butt welded directly to the pipe. Butt elbow according to its radius of curvature to points, can be divided into long radius butt welding elbow and short radius elbow; Press the pressure level to points, about seventeen, and the United States is the same standard pipe, one of the most commonly used is STD and XS two; according to the angle of the elbow points, a 45-degree butt welded elbow, a 90-degree butt elbow and 180-degree butt elbow and other elbows at different angles; Materials are divided into: carbon steel elbow, alloy steel and stainless steel elbow. 　　Butt welding elbow production process 　　1. Select the appropriate steel, cutting, cutting out elbows model map 　　2. Select the appropriate mold, the pressure on the tablet, into a half-bend. 　　3. The two half-piece bend together, welded together. 　　4. Due to the presence of weld, according to the need to polish the ...

　　1. Stainless steel tube with vertical external power supply, DC positive polarity (wire connected negative). 　　2. Generally suitable for 6mm thin plate welding, weld appearance, a small amount of welding deformation. 　　3. The shielding gas is argon with a purity of 99.99%. When the welding current is 50-50A, the argon flow rate is 8-0L / min. When the current is 50-250A, the argon gas flow rate is 2-5L / min. 　　4. Tungsten protruding from the gas nozzle length to 4-5mm is better in the fillet welding and other poor shielding is 2-3mm, where the deep groove is 5-6mm, the nozzle to the work of the general does not exceed the distance 5mm. 　　5. To prevent the emergence of welding pores, stainless steel pipe welding rust, oil, etc. must be cleaned. 　　6. Welding arc length, welding ordinary steel, preferably 2-4mm, while welding stainless steel tube, 3mm is better, too long, then the protection effect is not good. 　　7. Docking primer, in order to prevent the back of the botto...

　　As the use of square tube deep underground, in this environment is very easy to be corroded, so much attention to the quality of the square tube without any flaws. 　　Many shortcomings of the square tube is formed in the perforation in the hollow section so the power transmission process is the production of square tube the key process. High alloy perforation is the primary difficulty when the low perforation function, in order to ensure the quality of the perforation should be a rational choice of deformation parameters. The small amount of tightening will make the perforation process unstable, so the critical tightening amount is about 10% of the initial tightening volume, otherwise it will bite or even move to add the first card. The increase in the front of the head tightening will also constitute the hole cavity and the sound inside the shortcomings so if you want to ask customer questions tube billet must be ambitious, and the centering of the empty depth to compare according...

　　Circular hollow sections should pay special attention when welding. When welding, pay attention to seamless docking. There is no gap in the joint requirement, and it should be docked. Below we mainly look at how a lower circular hollow sections is welded? 　　Circular hollow sections is widely used in engineering construction, machinery manufacturing, steel construction projects, shipbuilding, solar power generation bracket, steel structure engineering, in addition, circular hollow sections are also used, for example, in the engineering installation industry, such as curtain walls, welded structures, and grid structures. 　　In order to ensure the strength after docking, a cross-ribbed plate may be welded in one of the circular hollow sections, and the circular hollow sections is beveled at the butt joint for penetration. When docking, it can be spot welded to another rectangular tube or H-shaped steel to maintain the straightness after docking. 　　Welding is not as small as possibl...

　　 Square tube quality must control the brightness after annealing. More influential factors are as follows: 　　1, The annealing temperature reaches the specified temperature. Stainless steel tube heat treatment is generally taken by solution heat treatment, which is commonly known as the "annealing", the temperature range of 1040 ~ 1120 ℃ (Japanese standard). You can also observe through the annealing furnace observation hole, annealing the square tube should be incandescent, but did not appear softening sagging. 　　2, Annealing atmosphere. Pure hydrogen is generally used as the annealing atmosphere, the atmosphere is the best purity of 99.99% or more, if the atmosphere is the other part of the inert gas, the purity can be lower, but absolutely can not contain too much oxygen, water vapor. 　　3, Furnace sealing. Bright annealing furnace should be closed, isolated from the outside air; the use of hydrogen as a protective gas, only one exhaust port is open (used to ignite ...

　　In general 304 stainless steel tube mills polishing wheel speed of 2500m / min, the polishing considerations also used in polishing, using the polishing tape 150 to 240 to obtain a continuous hairline surface processing line. In order to achieve the mirror polishing need to use fine abrasive gradually polished, and finally with a very fine polishing paste polishing. 　　 304 stainless steel tube plant in the wipe on the surface of the pipe, the operation is generally divided into two steps for the first polished shine polishing the second colored polishing. Fine polishing scratches left front rub polishing wheel with a light cut, the abrasive stick to the grinding wheel, but the wheel is rotated about the rub on the cutting lubricant, more viscous lubricants. The cutting lubricant is made of artificial abrasive (eg alumina) with a fine particle size of about 300 and hard grease as a binder. They saturate the cloth wheels. The same applies to the pigmented and blanched wipes, except ...

　　Residual stresses caused by uneven cooling of seamless square tubes . Residual stress is the internal self-equilibrium stress in the absence of external force. Hot-rolled steel of all kinds of cross-section has such residual stress. The larger the general section size of steel, the greater the residual stress. Although the residual stress is self-balanced, the performance of steel components in the external force or have a certain impact. Such as deformation, stability, fatigue and other aspects may have adverse effects. 　　Draw the seamless square tube process: Because the size of the extubation die hole is smaller than the outer diameter dimension of the seamless square tube before drawing (except expansion and contraction), in order to make the front end of the seamless square tube smoothly in order to make the clamping jaws of the drawn car clamp the head of the seamless square tube, the head of the seamless square tube needs to be pointed before the drawing to this end, the sea...

　　After any workpiece is machined, there will remain prestressed on the surface. The residual compressive stress on the rectangular tube can improve the wear resistance of the rectangular tube and the pre-fatigue of the tensile stress, while the residual tensile stress like the rectangular tube is actually opposite to the compressive stress. Let me introduce to you the reason why the prestress remains on the rectangular tube. 　　(1) Residual stress due to deformation caused by cold plasticity. In the other side of the pipe in the processing, because of the cutting force, resulting in the surface of the pipe has been processed by a strong cold plasticity and lead to deformation, leading to such a cold plastic deformation of the most prominent of which is: the tool above the knife face. The other side of the tube surface of the squeeze and friction generated deformation, because the rectangular tube of the base metal at this time is in the state of elasticity. After the cutting force di...

　　Forming method of circular tube is called bending, and the forming method of the rectangular tube is called buckling. There are two basic ways to bend forming: solid bending and empty bending. 　　1, Real bend 　　Real bend, as the name suggests is the compaction of the bend, the actual time when the inner and outer roller and tube billet two-way compaction. 　　1) The advantage of solid bending is small rebound, forming accurate, and as long as the roller type is accurate, the angle of the inner corner of the R is more accurate. 　　2) The disadvantage of real bending is the stretching / ironing effect. First, the actual bend will make the bend at the tensile, stretch effect so that the longitudinal length of the bend line shortened; Second, the real bend bending metal thinning due to stretching. 　 　2, Empty bend 　　Blank bending through the outer roller and the outer wall of the tube to form a one-way contact bending moment to strip material bending, empty bend will make the ben...

　　No matter which kind of steel pipe, going through inspection and text would be an important step for the guarantee of high quality. Today, our main theme would be the check methods of LSAW steel pipe. 　　Witness would be one of the checking methods. By time text and location exchange, we would know the basic information for the LSAW steel pipe. For example, we can use at least 2 week for the witness to figure out its regular inspection. 　　Monitor would be another step for the checking method. Work proceeds without the presence and special information of the test. Thus, we would adopt chemical component analysis, mechanical properties (Ultimate tensile strength, Yield strength, Elongation), Technical Properties (Flattening Test, Bending Test, Blow Test, Impact Test), and so on. Therefore, we can finally make sure the basic quality control for the LSAW steel pipe. 　　 http://www.xysteelpipe.com/info/Inspection-method-of-LSAW-steel-pipe-1271-1.htm

　　Hot-rolled stainless steel seamless pipe processing technology, according to different production methods can be divided into hot-rolled tube, cold-rolled tube, cold drawn tube, extrusion pipe. 　　1, Hot-rolled stainless steel seamless pipe is generally produced in the automatic rolling mill unit. The solid tube is inspected and cleared of surface defects, cut into the desired length, centered on the end face of the perforation of the tube, and then sent to the heating furnace for perforation. In the perforation at the same time continue to rotate and forward, in the roll and the role of the head, the tube gradually formed inside the cavity, said capillary. And then sent to the automatic rolling mill to continue rolling. Finally, the whole machine is the whole wall thickness, the sizing machine to achieve the specifications. The use of continuous rolling mill production of hot-rolled seamless steel pipe is a more advanced method. 　　2, If you want to get smaller and better quality ...

　　Notes of stainless steel pipe in the storage 　　1. First, the stainless steel pipe in the preservation of the time must be avoided and the corrosion of chemicals together, if the leakage will be on the stainless steel pipe erosion and damage. 　　2. Stainless steel pipe should also be kept in the storage of long time immersed in water, stainless steel corrosion is very slow, but if the time contact with water or will affect the quality. The purpose of ventilation is to avoid long-term stainless steel pipe in the humid air, can be timely ventilation, then you can drain the moisture. Of course, rain should try to do the work of rain. 　　Stainless steel pipes themselves have relatively high strength, so they are usually stacked with stacking. But in the code when the time to follow a certain principle, otherwise it may make the formation of steel pipe damage, or access to the inconvenience. The first principle of putting stainless steel tubes is stability and safety. The bottom of th...

　　Low temperature performance of stainless steel welded pipe is shown below 　 　1. Low temperature embrittlement 　　In low temperature environment, the deformation energy is small. In low temperature environment, the elongation and the decrease of the shrinkage of the section are called low temperature embrittlement. And more in the ferrite series of body-centered cubic tissue. 　　 2. Low temperature processing 　　Martensitic stainless steel is from the austenitizing temperature quenching and then cooled to very low temperature, in order to promote the martensite quenching method. Suitable for easy production of residual austenitic stainless steel. 　　Stainless steel welded tube at low temperatures, resistance, linear expansion coefficient, thermal conductivity, quality of hot melt and magnetic will change greatly. Resistance, the linear expansion coefficient decreases at low temperature; thermal conductivity, mass heat capacity decreases drastically at low temperatures; Young...

　　The annealing requirements for 304 stainless steel pipe are as follows: 　　1, Whether the annealing temperature reaches the specified temperature. 304 stainless steel pipe heat treatment is generally taken to solve the heat treatment, which is commonly known as the "annealing", the temperature range of 1040 ~ 1120 ℃ (Japanese standard). You can also observe the hole through the annealing furnace observation, the annealing area of the stainless steel pipe should be incandescent state, but did not appear softening sagging. 　　2, Annealing atmosphere. 304 stainless steel pipes are generally used as the annealing atmosphere of pure hydrogen, the atmosphere purity is best to more than 99.99%, if the atmosphere is another part of the inert gas, then the purity can be lower, but absolutely can not contain too much oxygen, water vapor. 　　3, The furnace seal. 304 stainless steel pipe bright annealing furnace should be closed, and the outside air isolation; the use of hydrogen as...

　　The seamless steel tubes that are common in our lives are round-tube type. So, do you know what it is used in our lives? 　　When it comes to the use of seamless steel pipes, we are most familiar with the fluid transportation of natural gas, water and other daily life. In addition to these common and well-known natural gas and water transportation, seamless steel pipes are also widely used to transport oil, gas and certain solid materials. Pipeline transportation realized by seamless steel pipes facilitates people's modern life and greatly reduces the transportation cost of natural resources. 　　Secondly, because the seamless steel pipe is hollow, its quality is much lighter than that of the ssaw steel pipe, and it is naturally more economical. Therefore, it plays an important structural part and component in the manufacture of drill pipes and bicycle frames such as automobile transmission shafts and petroleum. Character. At the same time, it also reduces unnecessary waste of re...