ERW Steel Pipe

　　 Stainless steel seamless pipe of metal and oxygen react in the atmosphere, in the appearance will form an oxide film. However, the oxidation of the iron oxide formed on the ordinary carbon steel pipe continuously causes the corrosion to be enlarged, and as a result, the pores are formed. If stainless steel seamless tube is damaged, we can use paint or oxidation-resistant metal such as zinc, nickel and chromium plating to cover the appearance of carbon steel, but, this maintenance is a layer of maintenance film, if the maintenance layer is damaged, the steel will corrosion. The corrosion resistance of stainless steel depends on the chromium, chromium is a part of steel composition, chrome on steel combined treatment, will change the appearance of the oxide type similar to pure chromium metal surface oxide. This tightly adhered chromium-rich oxide maintains the appearance and avoids further oxidation. 　　Heat treatment process includes heating, insulation, cooling, etc. This is done...

　　Large diameter seamless steel pipe is over 1000MM, which is made from steel ingot or solid tube, and then processed by hot rolling or cold rolling. Sometimes, the seamless steel pipes is long or short while using. Short seamless steel pipes can be welded, long seamless steel pipes can be cut off. Here are three methods of cutting large diameter seamless steel pipes to proper length to meet industry needs. 　　1. By saw machine 　　Saw machine can make neat section which is convenient for welding. The disadvantage is low efficiency. 　 　2. By gas cutting 　　Though gas cutting is fast, the disadvantage is presented notched surface which is not good for construction. 　　3. By cnc cutting machine 　　By cnc cutting machine, seamless steel pipes manufacturers will not save a lot cost but also can obtain smooth section of seamless steel pipe which has not much difference from cutting by saw machine.

　　In order to improve the seamless steel pipes for oil transportation, usually the surface should be treated for corrosion resistance. Common treatments include: cleaning, descaling, pickling, shot blasting four methods. 　　1. Cleaning. The grease, dust, lubricants, organic matter on the surface of seamless steel pipes usually can be cleaned by solvent or emulsion. But for rust, scale, welding slag can not be removed, that will need further process. 　　2. Remove rust by tools. Use a wire brush to polish the oxidation, rust, welding slag on the surface of seamless steel pipes. Tools can be divided into manual and power tools. Manual tools can reach class 2 level, power tools can reach class 3 level. For stubborn scale, it is possible can not be removed by tools, that will need further process. 　　3. Pickling. Common pickling include chemical and electrolytic methods. However, the corrosion resistance for seamless steel pipe should be chemical pickling. Chemical pickling steel surfac...

　　Identification of Fake and Shoddy Thick-walled Seamless Pipe 　　1. The shoddy thick-walled seamless steel pipe is prone to folding. Folding is a variety of fold lines formed on the surface of thick-walled seamless steel tubes, which often extend throughout the longitudinal direction of the product. The reason for the folding is that the inferior manufacturer pursues high efficiency, the degree of pressing is too large, and the ear is produced. When the next rolling is performed, the folding occurs, and the folded product is cracked after bending, then the strength of the thick-walled seamless steel pipe is greatly reduced. . 　　2. The surface of the counterfeit thick-walled seamless steel pipe often has a pockmark phenomenon. The pockmark is a defect caused by the irregular irregularity of the surface of the thick-walled seamless steel pipe due to the serious wear of the groove. Due to the pursuit of profit by shoddy and thick-walled seamless steel pipe manufacturers, the most freq...

　　According to production method 　　It can be divided into seamless steel pipe and welded steel pipe, and the welded steel pipe is referred to as straight seam steel pipe. Seamless steel pipes can be used in liquid pressure pipes and gas pipes in various industries. Welded pipes can be used for water pipes, gas pipes, heating pipes, electrical pipes, etc. 　　According to the uses of steel pipe 　　1. Pipes for pipelines. Such as: water, gas pipe, steam pipe seamless pipe, oil pipeline, oil and gas trunk line pipe. Agricultural irrigation faucets with pipes and sprinkler pipes. 　　2. Tubes for thermal equipment. Such as general boiler boiling water pipes, superheated steam pipes, superheated pipes for locomotive boilers, large smoke pipes, small smoke pipes, arch brick pipes and high temperature and high pressure boiler pipes. 　　3. Pipes for machinery industry. Such as aviation structural tubes (round tubes, elliptical tubes, flat elliptical tubes), automotive semi-axle tubes, axle...

　　 Galvanized steel pipe is a steel pipe that has been coated with zinc. This coating protects the steel from corrosion. It is most commonly used for outdoor construction like fences and handrails, or for some interior plumbing. It is also sometimes called galvanized iron pipe. Do you kown the reason why is so popular? 　　Below is three main using advantages of Galvanized Steel Pipes you might want to know: 　　1. After being hot-dip galvanized, the pipes of the surface will be protected well. Compared with other type of coating process, deepen the zinc is easier to let the coating covered well. 　　2. Because the zinc coating has a larger hardness value than steel pipes. After being galvanized, the impact resistance and anti-ware properties of the steel pipes has increased. 　　3. In general, the zinc layer at the pipe ends will be relatively thicker than other type of coatings. Therefore, it offers better toughness and abrasion resistance to the Galvanized Steel Pipes.

　　 Stainless steel pipe used in many filed, water supply system is one of them. The most common stainless steel pipes used to supply water are 304 seamless stainless tube and 316 stainless steel pipe. They can meet most of the water treatment and transportation requirement. 　　Basically, 304 seamless stainless tube is made of austenitic stainless steel. And 316 stainless steel pipe contains molybdenum element. So 316 stainless steel pipe has a better ability of resisting pitting and crevice corrosion than 304 stainless steel pipe. So knowing how to use stainless steel pipe, especially 304 seamless stainless tube and 316 stainless steel pipe is quite important. If the pipe system needs to use welding method, it is better to use 304L stainless steel pipe or 316L stainless steel pipe which contains low carbon steel or 316i stainless steel which contains titanium. If we use 304 seamless stainless tube and 316 stainless steel pipe, some necessary processing measures should be adopted, suc...

　　Nine tips for stainless steel pipe . 　　1. Transportation. When transporting the stainless steel pipe, it should be separated from other metal materials. We should use plank or rubber sheet to wrap the stainless steel pipe up. 　　2.Incision.When incising the stainless steel pipes, we should use the particular grinding wheel which is specially designed for cutting stainless steel pipes. 　　3. Positioned welding. When we deal with positioned welding of the stainless steel pipes, we should fill argon in the inside of welding line to protect the pipes. 　　4. The welding method of arcing. The starting arc should use reflowing welding while the closing arc should fill arc crater. 　　5. Connection. Before connecting the stainless steel pipelines or stainless steel fittings, or connecting the stainless steel pipelines or stainless steel fittings with non- stainless steel pipelines or fittings, we should fill argon into the pipe to protect the stainless pipes. 　　6. Multi-layer welding....

　　Press LSAW steel pipe and spiral welded pipe is divided into Longitudinal. Longitudinal simple consumer technology, consumption and high efficiency, low interest rates, to carry out fast. The strength of spiral steel pipe common than straight seam high, can narrow the larger diameter structural steel pipe billet consumption, but also the width of the blank with the same consumption of different diameter pipe. But with the same length of straight seam pipe compared to the weld length of 30 to 100% and the consumption rate is low. Thus, the smaller diameter pipe actually use straight seam steel pipe, large diameter spiral welded pipe is mostly used. 　　Welded steel pipe issteel or steel plate with a bending round, square and other shape and then welded into the surface of the pipe joints. Welded steel consumption process is simple. Types of specifications, equipment, less capital, but the average strength of less than seamless. Since the 1930s, with the consumption of high-quality st...

　　 Welded tubes are produced from a strip that is rolled formed and welded. Welded sizes up to and including 5” O.D. are certified to ASTM A -249/A-269 (average wall). This specification also ensures that tensile, yield and elongation tests have been performed, in addition to flaring, flanging, hardness, flattening and hydrostatic or non-destructive electrical tests. 　　Welded and Drawn Tubing available size range of .202” O.D. to 8” O.D. and wall thickness of .015” to 1” Cold-rolled strip in long coils is rolled to a tube form, then passed under the welding head, which melts the edges of the open seam to form a fusion weld. No filler metal or flux is used, and the weld bead is of the same analysis as the parent metal. All tubing is carefully inspected for weld porosity or other damaging faults before being approved for redrawing. 　　The welded tubing is then cold drawn in exactly the same way as seamless. As it undergoes repeated cold drawing and annealing it takes on the appearanc...

　　ERW resistance welded pipe automatic detection system can be equipped with high-precision delay marking module, speed measuring device, marking machine and universal adjustable frame. This system has synchronous alarm output function controlled by internal and external clocks, high-precision marking and mark width controllable function. 　　It is suitable for online or offline automatic detection of high-frequency electric resistance welded pipes in oil and gas casings, pipeline pipes and urban pipe networks. 　　The applicable range is Φ219-610mm. 　　Features: 　　1.Inspection of weld longitudinal, transverse and delamination according to standards and requirements, and weld thickness monitoring. 　　2.Test results (thickness values) are displayed in an intuitive and numerical way, easy to understand. 　　3.Gantry structure, pneumatic lifting frame, humanized design. 　　4.Image tracking and internal glitch tracking system. 　　 http://www.xysteelpipe.com/info/ERW-resistance-welded...

　　Seamless steel tube, the very important role in the national economy, is a kind of economic cross-section steel. It is widely applied in many departments such as petroleum, chemical industry, boiler, power stations, ships, machinery manufacturing, automobile, aviation, aerospace, energy, geology, architecture and military industry and so on. 　　 2. Classification of Seamless Steel Pipe 　　(1)According to the cross-section shape: circular cross-section pipe, special-shaped cross-section pipe. 　　(2)According to the material: carbon steel pipe, alloy steel pipe, stainless steel pipe, composite pipe. 　　(3)According to the connection ways: threaded pipe, welded pipe. 　　(4)According to the mode of production: hot rolling (squeeze, top, expand), cold rolling (pull out). 　　(5)According to utility: boiler tube, OCTG pipe, pipeline, structural pipe, chemical fertilizer pipe. 　 　3. The quality requirements of seamless steel pipe 　　(1) The steel chemical composition: the chemical c...

　　Galvanized pipe can be classified into two kinds: cold galvanized steel pipe and hot dip galvanized steel pipe . Cold galvanized steel pipe has been forbidden, and the hot dip galvanized steel pipe has been advocated temporarily in China. Below we will introduce you hot dip galvanized steel pip. 　　Hot dip galvanized steel pipe is to make the molten metal react with iron substrate so as to produce alloy layer so that the substrate can be combine with coating combination. Hot dip galvanized steel pipe is first taken acid pickling in order to remove iron oxide on the surface of the steel tube. After acid pickling, clean up in the tank of ammonium chloride or zinc chloride or ammonium chloride and zinc chloride mixed aqueous solution, and then sent to the hot dip plating tank. Hot dip galvanized has the advantage of uniform coating, strong adhesion, long service life, etc. 　　Steel substrate react complex physically and chemically with molten electrolyte solution, and then form into z...

　　 High-frequency pipe has many problems. Pipe opening is one of them. Below we will introduce you the problem and its relevant solutions. 　　 (1) Characteristics 　　Crack openings > = 0.4 mm. Welded joint is straight. Plate edge end face without melting trace or with melting trace is not welded. Both ends of cracks are very pointed and extend along the weld direction. Leak seriously when testing water pressure. 　　 (2) Causes 　　1) The blank width is less than the negative tolerance, so high-frequency steel tubes can not be welded. 　　2) Roller bearing is damaged which results in insufficient pressure. 　　3) The heat output is not enough, and the welding temperature is too low. 　 　(3) Methods of prevention 　　1) Check frequently strip steel geometric dimension. It is prohibited to use strip steel with ultra width and negative deviation. 　　2) High frequency heat output and welding speed should be matched properly. 　　3) Check whether the roller bearing is damaged or not...

　　The most common defects for seamless steel pipe is uneven wall thickness. For example carbon steel pipe, thickness deviation from the capillary puncher at least 7.5%, reducing the elongation rolling to 4.5% increase to 7% after expanding, then after tension reducing to 4.5%. 　　Seamless steel pipe wall thickness deviation performance reasons: 　　Since puncher in the head with a perforated plunger between the first support frame centering rollers cantilever structure is formed, so that the head during piercing irregular beating, so the head will be uneven force within the tube, causing the wall thickness deviation. 　　Manufacturing precision equipment and structures 　　Since the stability of the perforator roll and the guide plate is poor, so that the device generates a large jump in the perforation, the impact of the tube thickness of the device manufacturer; old structure and centering rollers on the roller and is generally due to the lower roller is not an institution drive, s...

　　At present, nearly each family is equipped with different types of the pipes to deliver water, gas as well as the warm steam. They are the parts of your family, and it is necessary to repair them occasionally. Thus, how to choose the pipes you really need is important. Knowing the main differences between these two pipes will help you find out the pipes suitable for your home. The main difference between the two pipes is their basic properties. Most of the black steel pipes are iron pipes, which have high carbon as well as the ferrite. And its name black steel pipe comes from the outer black oxide cover on the surface. Ever if the black steel pipe is a type of the structural steel pipe, they are not the same completely. 　　The second difference between steel pipe and black iron pipe is their applications. For example, the welded steel pipe is often used to like your water supply system to the general water supply system, while the black steel pipe is most commonly utilized to deliv...

　　 Seamless steel pipe is widely used in our daily life, it can be used as line pipe for oil, natural gas, water and fluid transmission purpose, API 5CT Casing, API 5CT Tubing, drill pipe, boiler tube, mechanical pipe, cylinder pipe, etc. Here we will introduce the standard and usage of cabon seamless steel pipe: 　　API 5L Gr.B: Specifiaction for line pipe. 　　ASTM A 106 Gr. B: Seamless carbon steel pipes?for high-temperature service. 　　ASTM A 53: Specification for black steel seamless pipes. 　　ASTM A 161: Seamless low-carbon and carbon molybdenum steel still tubes for refinery service. 　　ASTM A179: Specification for seamless cold-drawn low-carbon steel heat-exchanger and condenser tubes. 　　ASTM A192: Specification for seamless carbon steel boiler tubes for high-pressure service. 　　ASTM A 210: Specification for seamless medium-carbon steel boiler and superheater pipes. 　　ASTM A213: Specification for seamless ferrite alloy steel boiler, superheater and heat-exchanger pipe...

　　UT, which is short for Ultrasonic Test, is widely used for testing finished steel pipe . We all know that UT test is a must in steel pipe industry, but do you know what are the advantages of UT test? In the article, we will introduce the advantages of UT test. 　　Ultrasonic testing has lots of advantages in the application of pipeline inspection: 　　Non-destructiveness is the most important advantage. On the one hand, the inspected steel pipe doesn’t need to be cut or exposed to damaging chemicals component, which means the inspection won’t have any influence on its future usage. On the other hand, it does no harm to operators, leaving no potential risk for operators. It is both safe for the pipes and operators. 　　Strong penetrating power makes sure it has a wide detection range. Any defects can be detected. It is useful and efficient for steel pipe inspection. 　　High sensitivity features allow it to precisely and quickly find out the exact position on the steel pipe, providing...

　　 ERW steel pipe , which is short for electric resistance welded steel pipe, is widely used for low pressure liquid delivery, such as water, gas and oil field, oil drilling and machinery manufacturing, etc. 　　Today, we’ll talk about most common seen surface treatment for electric resistance welded steel pipe. 　　First comes fusion bond epoxy, also known as FBE coating, which is widely used to protect steel pipe used in pipeline construction from corrosion. Working temperature for FBE coated steel pipe can up from 180℃ to 250℃. 　　Then comes varnish coating. Varnish coating is the most general surface treatment for steel pipe. General varnish coating is just an oil-liked coating on pipe surface and have strong anti-corrosion effect. For industrial steel pipes, varnish steel pipes is needed. 　　Another surface treatment for ERW steel pipe is PE. Both PE and 3PE is common seen ways. PE coated steel pipe is widely used for liquid transportation usage pipe. 　　Another surface treatme...

　　Tubing has many benefits against piping. 　　1. Pipe threading or welding is difficult to disassemble and re-assemble. 　　2. Piping requires skilled worker for welding & threading. 　　3. Piping is bulky. 　　4. Tubing is assembled by simple wrench make-up on DK-LOK tube fittings reducing assembly time and the overall cost of installation. 　　5. Tubing is bendable, allowing lower pressure drop with fewer connections. This in tur 　　Careful handling and storage practices will protect tubing from unnecessary scratches, nicks and or degrading good tubing surface finish. 　　1. Tubing ends should be capped so any foreign materials will not fall inside during transportation and storage. 　　2. Do not drag across tubing rack, cement, gravel or any rough surface. 　　3. Do use correct tube cutter for tube material. The wrong cutter may result in excessive deformation of the tube end. 　　4. Do not cut deep with each turn of cutter. 　　5. Tube cutters and hacksaws should be sharp eno...

　　 High-frequency pipe has many problems. Pipe crack is one of them. Below we will introduce you the problem and its relevant solutions. 　　 (1) Characteristics 　　Water penetration crack: crack width < 0.4 mm. The crack has caking traces. Spray with the shape of mist or leak when testing water pressure. 　　Micro-crack crack: outer surface has visible microgrooves, and the inner surface is in good condition. There is no leakage phenomenon when testing pressure but it is crazed if being crushed or cold bending. 　 　(2) Causes 　　1) Low welding temperature (insufficient heat output, and fast welding speed). 　　2) Roller bearing loss or small strip cause insufficient extrusion force. 　　3) The sixth and seventh piece of guide roller blade are damaged, and crush the strip steel edge. 　　4) Strip steel edges have inclusions and its state of edge is unstable. 　　5) The roll adjustment is improper causing the edge drawing. 　　6) Weld reverse and uneven heating temperature of two...