steel pipe

　　The biggest difference between ERW steel pipe and seamless pipe is there is a welding seam on ERW steel pipe. Seamless process of ERW steel pipe includes geometric seamless and physical seamless. 　　What is ERW steel pipe geometric seamless? The definition is removing the burr of ERW steel pipe on the inside and outside. As the continuous improvement of the structure of the inner burr removal system and cutting tool, the clearance of the burrs in the large and medium diameter pipes has been well handled. Burr can be controlled in the -0.2mm ~ O.5mm or so. 　　What is ERW steel pipe physical seamless? This method has been widely used by the world's most advanced ERW unit to deal with the weld, and that has achieved good results. The high-quality ERW steel pipe not only can not discern the weld, and the weld coefficient can reach to 1, achieves the weld area organization and base metal match. It means that the difference between the metallographic structure inside the weld and th...

　　Hunan Great Steel Pipe shared the advantage of hot-rolling seamless steel pipe previously. Next, we will continue to share its disadvantages for all of you. 　　1. After hot rolling, non-metallic inclusions (mainly sulfides and oxides, as well as silicates) inside the steel are pressed into flakes and delamination (interlayer). Stratification makes the performance of the steel in the thickness direction greatly deteriorated, and there may be tearing occurs when the weld shrinks. The local strain induced by the weld shrinkage often reaches several times the yield point strain, much larger than the load caused by the load. 　　2. Unstable cooling caused by residual stress. Residual stress is in the absence of external force under the action of internal self-balanced, all kinds of cross-section of hot-rolled steel have such residual stress, the general steel cross-sectional size, the greater the residual stress. Although the residual stress is self-balanced, but the steel components un...

　　In the production, pipe manufacturers (such as Hunan Great Steel Pipe) use high frequency technology to produce ERW steel pipe . And other welding of important components, welding of alloy steel and welding of thick parts all require preheating before welding. 　　The choice of preheating temperature and interlayer temperature is not only related to the chemical composition of steel and electrode, but also to the rigidity of welded structure, welding method, ambient temperature and so on. It should be determined after considering these factors. In addition, the preheating temperature in the direction of the steel plate thickness uniformity and uniformity in the weld area, has an important impact on reducing the welding stress. The width of the local preheating should be determined according to the degree of restraint of the workpiece to be welded, generally it should be around the weld area three times the wall thickness, and is not less than 150-200mm. If the preheating is not unifo...

　　As we all know that SSAW steel pipe will rust and be unsound if we don’t do some measures to stay its stability. therefore we are going to take regarding the way to increase the steadiness of the SSAW steel pipe these days. 　　1. For tiny and medium-sized steel, wire rod, rebar, steel pipe with medium diameter, wire and wire rope, etc., will be keep in well-ventilated shed, however should place covering within the higher a part of the products and underlay at all-time low of the products. 　　2. Some tiny steel form, sheet steel, steel strip, semiconducting material steel sheet, tiny diameter or thin-walled steel pipe, every kind of cold-rolled or cold-drawn steel and therefore the metal product with high costs and easy-to-corrode will be keep in warehouse. 　　3. Within the warehouse, SSAW steel pipe shouldn't be stacked with the acid, alkali, salt, cement and different materials that have corrodibility on steel along. totally different styles of steel ought to be stacked on a...

　　The steel pipe wall thickness series comes from the British metrology unit, and the score is used to express the size. The wall thickness of the seamless pipe is made up of the Schedule series (40, 60, 80, 120) and is connected to the weight series (STD, XS, XXS). These values are converted to millimeters as part of the tube wall thickness series. (Note: Size - the value of Schedule40 is not constant, but to look at the outer diameter of the tube.) 　　The method of expressing the pipe diameter and thickness, the nominal outer diameter and the minimum thickness of the pipe for the heating surface, the NPS for the pipe pipe and the schedule number of the pipe wall. The wall thickness series consists of 8 series from 10 to 20, 30, 40, 80, 120, 140, 160. The 40 series is the standard series, the 80th is the thick series, and the 120 is the extra thick. series. 　　The wall thickness of American Standard and domestic standard is quite different. Generally, the two pressure grades of CL.1...

　　Hunan Great Steel Pipe is a leading steel pipe manufacturer and exporter. We provide a large number of carbon steel pipe for sale, including ERW steel pipe , SSAW steel pipe, LSAW steel pipe and so on. And Next, Great Steel Pipe will share differences among them for all of you. 　　 ERW Steel Pipe 　　The ERW steel pipe applied wide hot rolling steel profile as raw material, and went through pre-bending, continuous forming, welding, straightening, cutting and other processes. So the ERW steel pipe has short weld joints, high dimensional accuracy, uniform thickness, and excellent surface and can bear high pressure. 　　Its disdvantages inckudes small diameter and thin wall, and the weld joints are easy to be eroded. The drawback of ERW steel pipe is that it only has small and medium-caliber thin-walled tube, and welding is easy to produce gray leaf spot. So ERW steel pipe is more widely used in areas of city gas, crude oil transportation. 　　 SSAW Steel Pipe 　　SSAW steel pipe has s...

　　Roll adjustment had a great influence on the quality of welded steel pipe in the process of production. Next, excellent pipe manufacturer Great Steel Pipe will tell you how to control roll adjustment influence on the quality of welded steel pipe. 　　1. Replace the steel pipe specifications, we generally replace a complete set of roll. Roll adjustment method is: use a wire to pull a centerline from the unit inlet to the outlet, and make the molding line to meet the technical requirements. After changing the roll specifications, we need to make a comprehensive adjustment for forming roller, guide roller, squeeze roller, sizing roller firstly, and then focus on the adjusting the closed hole of forming roll, guide roller, squeeze roller. 　　2. In the slow turning starting sequence of the welded pipe unit, we should pay close attention to the bearing rotation of the various parts of the roll, and adjust the roll at any time to ensure that the welding pipe welding quality and process si...

　　How to ensure that the product quality of the high frequency welded steel pipe meets the requirements of the technical standards in production process? Raw materials, welding technology, roll adjustment, roll material, equipment failure, production environment and other reasons should be taken into consideration. Next, Great Steel Pipe will introduce that for all of you. 　　 Raw material 　　Factors affecting the quality of raw materials mainly include three aspects, the unstable mechanical properties of the steel strip, the surface defects of the strip and the large deviation of geometric size. Therefore, tube manufacturers should control from these three aspects. 　 　High frequency welding 　　In the process of high frequency welding of steel pipe, welding technology and the control of process parameters, the position of the sensor and resistor,etc., have a great influence on the weld pipe weld quality. 　 　Roller adjustment 　　The employee ought to master the roll adjustment ...

　　To ensure the standard of welded steel pipe , we want to require the geometric dimensions of steel strip into thought, beacause the fluctuation of the strip dimension not solely affects the accuracy of the steel pipe's outer diameter, however conjointly seriously affects the surface quality of the steel pipe. 　　1. If the dimension of the steel strip is a smaller amount than the allowable deviation, the compression force of the welded steel pipe are reduced, which is able to cause the attachment of the steel pipe loose, and cracks or open-end pipe can seem. 　　2. If the dimension of the strip is bigger than the allowable deviation,the compression force are inflated once the steel pipe is welded, which is able to cause tip, attachment or burr attachment defects showing on the weld of the steel pipe. 　　Thickness fluctuations not solely have an effect on the thickness accuracy of the finished steel pipe, at a similar time, the distinction of steel strip's thickness can cause...

　　The emergence and maturity of high-frequency welding technology, directly promoted the development of LSAW Steel Pipe industry, it is the key processes of LSAW Steel Pipe production. High-frequency welding originated in the fifties of last century, it is a new welding process that uses the skin effect and adjacent effects produced by high-frequency current to make the steel plate and other metal materials docked.Good or bad quality of high-frequency welding directly has an impact on the overall strength, quality grades and production speed of welded pipe products. As a manufacturer of welded pipe, you must understand the basic principles of high-frequency welding, understand the structure and working principle of high-frequency welding equipment, and understand the high-frequency welding quality control points. 　　Relatively the 50Hz AC current frequency speaking, high frequency is generally refers to 50KHz ~ 400KHz high frequency current. When high-frequency current flow through t...

　　1. The stacking principle requirements of SSAW steel pipe is stable and ensuring the safety, so we should stacking SSAW steel pipe according to specifications, different varieties, different materials, and different specifications SSAW steel pipe should be stacking respectively, to prevent muddy and mutual erosion. 　　2. SSAW steel pipe is prohibited in the steel pipe stacking around the location of the erosion of steel pipe objects. 　　3. SSAW steel pipe bottom should be high, strong, smooth, to prevent the material damp or deformation. 　　4. The same kind of material SSAW steel pipe should be stacking in accordance with the order of storage in order to facilitate the implementation of the principle of improving the predecessors. 　　5. If the SSAW steel pipe in the open space, must be under the spiral pipe to prevent the wooden mat or stone, etc., and the stack should be slightly inclined to facilitate drainage, and pay attention to whether the steel pipe is straight to prevent...

　　Straight seam submerged arc welded pipe is widely used. At present, the application of LSAW has been extended to many fields. In addition to oil and gas long-distance pipelines, it has also developed into marine structures such as offshore platforms and offshore floating cranes. Submerged arc welded pipe has obvious advantages as a marine structural pipe, such as uniform wall thickness, simple process, low performance due to pipe making process, easy to achieve high strength and high toughness requirements, and flexible adjustment of specifications to meet different pipe diameters. Requirements. 　　However, since the service environment of the marine structure pipe is different from the land fluid transport pipe, the marine structure pipe is used in a severe marine working environment such as waves, sea tides, storms, and cold drift ice. In addition to the general pipe performance, it also puts higher requirements on its toughness and weld quality. 　　The main materials of straight...

　　In the process of three typical production methods, the main pipe equipment, pipe forming unit cold drawing machine, cold rolling unit and cold reducing unit, has a decisive role in the formation of precision welded pipe. But the equipment types of precision pipe pipe is much, the range of that is big, and technical performance requirements are different. If we want to meet the quality requirements of precision welded pipe, we must be suitable configuration. 　　1. On the manufacturing stage of precision welded pipe: 　　Strip preparation - Desktop rack or chain conveyor 　　Uncoiler - Cantilever or Double Cone Uncoiler 　　Straightening of steel - Roller leveling machine 　　Shear - oblique cutting shears 　　Butt welding machine 　　Live sets of materials - live sets (box, cage, spiral, tunnel, etc.) 　　Milling edge planing edge - milling edge planing machine 　　Forming - continuous forming machine (roll, row roll, FF forming, etc.) 　　Welding - high frequency induction or conta...

　　There are many kinds of elbows, as a leading manufacturer and exporter, Great Steel Pipe provides three kinds of steel pipe elbow for customer to choose, including carbon steel, stainless steel, and alloy steel. Among them, carbon steel elbow also includes seamless elbow and welded elbow. Next, Prime Steel Pipe will share the manufacturing process of seamless elbow and welded elbow for all of you. If you need to purchase elbow, Great Steel Pipe must be your best choice. 　 　Manufacturing Process of Seamless Elbow 　　The manufacturing process of seamless elbow usually contains heating bending and clod bending. One of the most common methods is using hot mandrel bending from straight steel pipes. Applying hot mandrel bending can manufacture a wide size range seamless elbows. After heating the steel pipe at a elevated temperature, the pipe is pushed, expanded, bended by the inner tools of mandrel step by step. 　　When compared to other bending method type the advantages of hot bendi...

　　As steel pipe supplier with more than 20 years, Xinyue has listed a main categories for hollow section tube except the general seamless steel pipe and weld type. Today, we shall list our hollow section tube offering here. 　　A hollow section tube has a hollow tubular cross section, made by structural steel per code. 　　Scaffolding tube: Scaffolding is a temporary structure used to support people and material in the construction or repair of buildings and other large structures. Material Storage Racks, Pallets, Hydraulic Platforms, Trusses, Columns, Purlins, Greenhouse, Stands Towers, Agricultural Equipment. 　　Rectangular tube: This steel pipe will be used in fluid transportation, construction structure, etc. 　　Anti-corrosion steel pipe: Anti-corrosion steel pipe is processed through the preservation process, which can effectively prevent or slow down the process in the transport and use of chemical and electro-chemical corrosion reaction of steel pipe. 　　Square steel tubes: ...