ERW Steel Pipe

　　Tube billet heating temperature for the seamless tube manufacturer refers to the tube blank discharge temperature. It should be determined to ensure that the steel is subjected to the main deformation within the best range of plasticity. The basis for determining the heating temperature is the iron and carbon balance diagram. In practice, the following factors should generally be considered. 　　1. Steel grade. Different steel grades correspond to their different heating temperatures. 　　2. Temperature drop. The temperature drop (outer) of the new product from the ring heating furnace to the rolling mill process line should generally ensure that the metallographic structure before the end of deformation is in the single phase zone. 　　3. Heating defects. The slab should be prevented from overheating or even overheating. 　　 http://www.xysteelpipe.com/info/Seamless-tube-billet-heating-temperature-1415-1.htm

　　Faced with a large number of 20# seamless steel pipes , for some friends who are not very familiar with 20# seamless steel pipe, there will inevitably be some problems in the process of purchasing. Here are some tips on how to buy 20# Seam steel pipe. 　　In terms of quality, you can start with the fullness of color and hole type. You need to know that the inferior 20# seamless steel tube color is light red, and the hole shape also shows an elliptical state. If it is in the process of purchase, it is found that such 20# seamless steel pipes should not be purchased. Carefully observing the surface of 20# seamless steel pipe, the surface of the inferior 20# seamless steel pipe is not flat. It often carries some burrs. In the process of purchasing, you can also use your own hands to draw the surface of the steel pipe. Do not buy if there are scratches, because the high quality 20# seamless steel tube has strong toughness and wear resistance, sharp objects can not scratch it. Perhaps you...

　　Preheating is required before welding important components, alloy steels parts and thick parts. The main role of preheating before welding is as follows: 　　(1) Preheating can slow down the cooling rate after welding. It is conductive to the diffusion of hydrogen in the weld emtal escape. Besides, it can avoid to hydrogen-induce cracking, reduce the weld and heat affected zone hardened to improve the crack resistance of welded joints. 　　(2) preheating can reduce the welding stress. Uniform local preheating or integral preheating, the temperature difference (also called temperature gradient) between the workpiece to be welded in the weld zone can be reduced. In this way, on the one hand to reduce the welding stress, on the other hand, reduce the welding strain rate, help to avoid welding cracks. 　　(3) preheating can reduce the binding degree of welded structure, to reduce the degree of constraint is particularly obvious, with the preheating temperature increases, the incidence o...

　　How to Choose the SSAW Carbon Steel Pipe Manufacturer 　　Usage of SSAW carbon steel pipe is relatively high, the application is very wide, it should be how to choose before in the selection to pay attention to quality. 　　The first method is a more professional detection method, that is, by the strength of the pressure vessel to be detected. Commonly, we use atmospheric pressure and water pressure to detect, in this way can detect the working conditions of the SSAW carbon steel pipe in the pressure working environment, but also to detect the tightness of the spiral steel pipe, generally take the atmospheric pressure detection, because such security Relatively high, and if the water vapor pressure through the test, then the need to remove the spiral pipe after the water, too much trouble. 　　The second method is also relatively simple, that is, through the surface of observation. With the naked eye found in the spiral steel pipe in the welding and size of the problem, if necessary...

　　 Welded steel pipe production process is a steel sheet, strip, and other various molding methods using the straight press roll or helical direction curling into a desired cross-sectional shape, and then by means of heat, pressure, different methods of welding weld together to obtain steel. Therefore, defects in the welded steel pipe is divided into two parts: the steel base material defects and weld defects. 　 　1. Steel base material defect 　　The sheet material defects after rolling and other processes, most of planar, parallel to the surface; their main weakness delamination, inclusions, cracks, folds, etc., which is the most common layered internal defects. Stratification will produce a variety of cracks when the tensile stress perpendicular to the surface of the sheet by the hierarchical will seriously affect the strength of the steel pipe, it is not allowed defects 　　 2. Weld defects 　　Weld defects refers to defect during welding or after welding resulting in the weld is...

　　The purpose of tempering stainless steel tube is to transform quenched martensite into tempered martensite, eliminate retained austenite, reduce and eliminate internal stress, obtain high hardness, wear resistance and red hardness, stabilize dimensional and improve mechanics. Its performance to meet the needs of its work. Generally, the tempering temperature is generally between 540 ~ 570°C, and it is kept in the 100% KNC)3 salt bath for 1 to 1.5 hours. Due to the tempering of high-speed steel, the fine carbides of W, Mo and V are precipitated in the martensite, and the residue remains. Austenite transforms into martensite during the III fire process and therefore has a "secondary hardening" phenomenon, which should be tempered three times. 　　In order to ensure the tempering effect of high speed steel, the following issues should be noted: 　　1.After the stainless steel tube is quenched, it should be tempered immediately, otherwise the retained austenite will be stabiliz...

　　Natural gas pipeline refers to the pipeline that transports the natural gas (including the production of oil associated gas) from the mined land or processing plant to the city gas distribution center or industrial enterprise users, also known as gas line. In the world pipeline overall length, natural gas pipe accounts for about half. 　　The steel pipe is the main material of the natural gas pipeline. Modern gas gathering lines and gas line are made of steel pipes those connected by welding. There are various kinds of steel pipe, including seamless steel pipe, spiral welded pipe, longitudinal welded pipe. Seamless steel pipe be appropriate for natural gas pipe that the diameter is below 529mm, and spiral welded pipe and longitudinal welded pipe are suitable for large diameter pipe. 　　Features of natural gas pipeline: 　　(1) The gas line system is a continuous closed conveyor system. 　　(2) From the transport, storage to the user, natural gas is with high pressure. 　　(3) Due t...

　　We all know that the individual quality of spiral welded pipe is relatively large, so it must be stacked outdoors. But it is difficult to avoid being exposed to the sun and rain. So the rust problem has been puzzled the storage time and conditions of spiral welded pipe. Today, we need to carry out a comprehensive solution to the knowledge of anti-corrosion technology of spiral welded pipe. 　　The toolrust-removal of spiral welded pipe mainly uses steel wire brush and other tools to polish the steel surface, and then cleans and preheats the spiral welded pipe, which can remove loose or turnup mill scale, rust, welding slag and so on. Using manual tool to remove rust can reach Sa 2 level, using power tools can reach Sa 3 level. If there is steady oxide-scale adhering to the steel pipe surface, the effect of toolrust-removal is not ideal, it can not up to the depth of abrasion pattern that required by anti-corrosion construction. 　　Pickling refers to use solvents, emulsions to clean...

　　Although small caliber spiral welded pipe is small, its function is a lot. So what the features and uses of small diameter spiral welded pipe are? 　　Features of small-diameter spiral welded pipe: 　　The production process of spiral welded pipe is simple, but it has high production efficiency. It can use material to form a larger pipe diameter pipe, it can also use the same width of preform body to product pipes with different diameter. However, compared with the same LSAW steel pipe, the length of weld seam is increased by 30% to 100%, and its production rate is low. Therefore, the smaller diameter of the steel pipe mostly use straight welding, large diameter welded pipes mostly use spiral welded pipe. 　　Uses of small-diameter spiral welded pipe: 　　Spiral welded pipe is mainly used in tap water engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, urban construction, and it is one of the 20 key products for the development of China. ...

　　Welded carbon steel pipe includes LSAW (longitudinal submerged arc welded) steel pipe and spiral welded pipe. Some people those do not very understand this industry may not know differences between the former and the latter very clearly. Don’t worry, today we will talk about this topic. 　　 Spiral welded pipe is made by using low carbon construction steel strip or low alloy structural steel strip to roll into a tube according to a certain helix angle (called the forming angle), and then welding the seam together. It can use the narrow band steel to produce steel pipe with large diameter. Spiral welded pipe is mainly used for oil and natural gas pipeline, its specifications are expressed by outer diameter * wall thickness. Spiral welded pipe with also includes single-sided welding and double-sided welding. 　　LSAW steel pipe is made by using strip steel as raw materials and doing longitudinal welded in the high-frequency welding equipment(hence the name due to the weld forms a stra...

　　When the factories of Prime Steel Pipe manufacture welded steel pipe , the strip is fed into the welded pipe unit, rolled by the multi-way roll, the strip is gradually rolled up to form the circular tube with the opening gap, the pressing amount of the pressing roller is adjusted so that the gap of the weld is controlled at 1 ~ And make the ends of the weld flush. If the gap is too large, resulting in reduced proximity effect, insufficient eddy current heat, weld intergranular junction failure caused by non-fusion or cracking. If the gap is too small is caused by the adjacent effect increases, welding heat is too large, resulting in weld burns; or weld seam formed a deep pit after squeezing and rolling, which affects the surface quality of the weld. 　　 1.The control of welding temperature 　　The welding temperature is mainly affected by the high-frequency eddy current thermal power. According to the correlation formula, the high-frequency eddy current heat is mainly affected by th...

　　Today, Prime Steel Pipe will share the type of rotary contact wheel welding for everyone. In rotary contact wheel welding, the electrical current is transmitted through a contact wheel at the weld point. The contact wheel also applies some of the forge pressure necessary for the welding process. The three main types of rotary contact wheel welders are AC, DC, and square wave. In all three power supplies, electrical current is transferred by brush assemblies that engage slip rings attached to a rotating shaft that supports the contact wheels. These contact wheels transfer the current to the strip edges. 　　AC Rotary Contact Wheel Welding. In an AC rotary contact wheel welding machine, the current is transferred through the brushes to the rotating shaft, which has a transformer mounted on it. The transformer reduces the voltage and increases the current, making it suitable for welding. The two legs of the transformer's output circuit are connected to the two halves of the rotatin...

　　Double submerged arc welded spiral steel pipe is a kind of spiral welded pipe created by Prime Steel Pipe. With its high capability, tiny resistance, coldness resistance, corrosion resistance, straightforward installation and maintenance, etc., it's favored by a lot of and a lot of oil and gas, slurry transportation, urban construction and alternative industries. 　　The producing process of spiral double welding pipe: 　　1. Double submerged arc fastening method, the plate deformation uniformly tiny, residual stress, surface doesn't turn out scratches. process of pipe diameter and wall thickness of the pipe sizes range, larger flexibility, particularly within the production of top-grade steel thick-walled steel pipe, massive diameter thick wall pipe has the unparalleled advantage of alternative technology, to satisfy the users in pipe size requirements; 　　2. Bewildering outside fastening (the fine welding) the method are often enforced within the best position fastening, ...

　　Modern urban gas transmission and distribution system is a complex integrated facilities, the main part of it is the gas pipe network. The cost of the pipeline laying takes up about 60% to 70% of the total cost of the project, of which the cost of pipe takes up about 60% of the cost of laying the pipe network. There are many types of pipes used for conveying gas, mainly includes steel pipe, cast iron pipe and PE plastic pipe and so on. We must be based on the nature of the gas, system pressure and construction requirements to choose, and should meet the mechanical strength, corrosion resistance, seismic and air tightness and other basic requirements. 　　Steel pipe is the most widely used pipe in gas engineering. In the field of urban gas, and even the entire gas field, steel pipe has played an irreplaceable important role. Its main advantages are: high strength, good toughness, bearing stress, impact resistance and tightness, good plasticity, easy welding and hot processing, thin w...

　　The selection and installation of water pipelines in pipeline engineering has become a problem that cannot be ignored in the renovation. In order to make the living room beautiful, people often use buried wall construction when water pipes are used for decoration. However, once the water pipeline leaks and bursts, it will cause great difficulties for maintenance. 　　The reasons for this may come from the following aspects: 　　First, the plastic tube used is not a qualified product. There are some products with poor quality and unqualified quality in the market. For example, the pressure resistance, the coefficient of thermal expansion and expansion cannot meet the technical requirements, and if the construction is not standardized, there will be problems in the project. 　　Second, the physical and chemical properties of the plastic tube itself are determined. Because the plastic tube is connected by metal at the bend, the plastic tube is not welded with the metal or the screw, but...

　　When Prime Steel Pipe manufacture pipe bend, there are some factors will influence the quality of pipe bend. How to solve those problems? High-class carbon steel pipe provider - Prime Steel Pipe will share it for all of you. 　　1, The role of the tube in the external force M under the role of the outer layer of the lateral wall of the tensile stress & 1 role of thinning, the lateral compression stress. The role of thickening, together N1 and N2 to make the pipe cross-section changes. Based on this factor, the main reason for the decline in the quality of the elbow is the main reason for the RX and SX. Therefore, GBJ235-82, the various pressure levels in the case of the RX value and the amount of lateral thinning are made clear, the purpose is to control the RX With the value of SX, thus ensuring quality. 　　2, The bending accuracy of the pipe bend is also one of the factors affecting the quality. When we manufacture the bending foot, in addition to the size of the specification...

　　There are many kinds of steel pipe elbows, as a leading manufacturer and exporter, Prime 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, Prime 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...

　　 Seamless steel pipe is divided into two categories, including hot-rolled and cold-rolled seamless steel pipe. 　　Hot-rolled seamless steel pipe contains general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, oil cracking pipe, geological pipe and other steel pipe. 　　In addition to the general steel pipe, cold-rolled seamless steel pipe also contains low pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, oil cracking pipe, other steel pipe, but also include carbon thin-walled steel pipe, alloy thin-walled steel pipe, stainless steel pipe, special-shaped steel tube. 　　The diameter of hot-rolled seamless pipe is generally greater than 32mm, wall thickness is 2.5-75mm, the diameter of cold-rolled seamless steel pipe can be 6mm, wall thickness can be 0.25mm, the diameter of thin tube can be 5mm, wall thickness is less than 0.25mm, Cold-rolled seamless s...

　　Rolling situation of thick-walled seamless steel pipe: 　　1, The hot-rolled rolling position of thick-walled seamless steel tube is 38, 118m away from the strip head, mainly located in the middle of the strip. 　　2, It is presumed from the shape of the large hole of the rolling, that the crack starts in the middle of the width of the strip. The reason is that the rolling force and the shearing force cause the crack to stretch and form a macroscopic macroscopic hole. 　　3, The seamless steel pipe has a smooth fracture surface in the cold rolling production process, and no obvious surface defects are observed before and after the fracture. 　　4, Observing the micro-morphology of the fracture, the typical dimple-like ductile fracture morphology is observed, and the fracture is layered, the central dimple is larger, the dimple is reduced at the near surface, and the crack exhibits divergence and expansion dominated by the central fracture. The fracture morphology is deep, and the dep...