ERW Steel Pipe

　　The production method of seamless steel pipe is roughly divided into a cross-rolling method (Mengnesmann method) and an extrusion method. The cross-rolling method (Mennesmann method) is to first pierce the tube with a diagonal roll and then extend it with a rolling mill. This method has a high production speed, but has high requirements on the processability of the tube blank, and is mainly suitable for the production of carbon steel and low alloy steel tubes. The extrusion method uses a piercing machine to perforate a tube blank or a steel ingot, and then extrudes it into a steel tube by an extruder. This method is less efficient than the cross-rolling method and is suitable for producing a high-strength alloy steel tube. 　　Both the cross-rolling method and the extrusion method must first heat the tube blank or the ingot, and the produced steel tube is called a hot rolled tube. Steel pipes produced by hot working can sometimes be cold worked as needed. There are two methods for co...

　　The production method of seamless steel pipe is roughly divided into a cross-rolling method (Mengnesmann method) and an extrusion method. The cross-rolling method (Mennesmann method) is to first pierce the tube with a diagonal roll and then extend it with a rolling mill. This method has a high production speed, but has high requirements on the processability of the tube blank, and is mainly suitable for the production of carbon steel and low alloy steel tubes. The extrusion method uses a piercing machine to perforate a tube blank or a steel ingot, and then extrudes it into a steel tube by an extruder. This method is less efficient than the cross-rolling method and is suitable for producing a high-strength alloy steel tube. 　　Both the cross-rolling method and the extrusion method must first heat the tube blank or the ingot, and the produced steel tube is called a hot rolled tube. Steel pipes produced by hot working can sometimes be cold worked as needed. There are two methods for co...

　　 Welded steel pipe is bent with steel or steel plate is round, square and other shapes and then welded into the surface of the seam with the steel pipe. Common types of welded steel pipe are the following: 　　General pipe, used to transport low-pressure fluid, easy to weld the other soft steel manufacturing. Steel pipe to pipe and thick steel pipe specifications with the nominal mouth of the water pressure, bending, flattening and other experiments, the surface quality has certain requirements, usually the length of the delivery of 4-10m is actually different, the pipe according to the provisions of the wall thickness Two kinds of steel, according to the thread and no thread two. 　　Roller, for belt conveyor roller welding steel pipe, the general water pressure and flattening test. 　　Metric welded pipe, specifications with a seamless tube form, with ordinary carbon steel, high quality carbon steel or Cape can be low-alloy steel tropical, cold belt welding, or with a tropical wel...

　　The seamless pipe line is mainly used for pumping high pressure oil and gas near the wellhead. As the corrosion problem of hydrogen sulfide is becoming more and more serious, the development of anti-sulfur seamless pipeline tube is urgent, and the anti-sulfur performance is the key. Discusses the influence of hydrogen induced crack (HIC) resistance of medium and material factors, Cu, Ni join can improve the performance of seamless line pipe material HTC reduce the S content in the steel, by spraying calcium silicon powder also can reduce the sensitivity of hydrogen bubble. 　　With the development of oil and gas exploration, the problem of hydrogen sulphide corrosion is very acute because of the increasing amount of oil and gas Wells in the complex and sulfur environment. In recent years, there has been an increase in demand for the seamless pipe line. The seamless pipeline pipe is mainly used for pumping high pressure oil and gas near the wellhead, and it is made by seamless tube p...

　　A tube is a closed shape used to perform some structural function. The shape can be round, square, rectangular or whatever can be designed and manufactured for a particular application. Round tubes differ from pipes in the way they are dimensioned. A 1 1/2-inch round tube has a 1 1/2-inch outside diameter. A 1 1/2-inch round pipe has a 1 1/2-inch inside diameter. The reason being that the outside of tubes is important for structures, however the inside of pipes is used for fluid flow. 　 　 Welded Steel Tube 　　Welded steel tubing is made from either hot-rolled or cold-rolled steel that is provided to the tubing manufacturer in coils. The coil may be processed to remove scale, improve finish, amend heat treatment or in other ways to achieve the specified end product. The coil is then run through grooved rollers until the shape has been formed and the free edges are correctly spaced for welding. 　　The edges of the tube are butt welded together, generally with electrical resistance ...

　　A tube is a closed shape used to perform some structural function. The shape can be round, square, rectangular or whatever can be designed and manufactured for a particular application. Round tubes differ from pipes in the way they are dimensioned. A 1 1/2-inch round tube has a 1 1/2-inch outside diameter. A 1 1/2-inch round pipe has a 1 1/2-inch inside diameter. The reason being that the outside of tubes is important for structures, however the inside of pipes is used for fluid flow. 　　 Seamless Steel Tube 　　The manufacture of seamless steel tube typically begins in an electric arc furnace. The steel is then cast as an ingot or continuously cast as a bloom. The bloom is then rolled into a billet. The solid billet becomes a tube by being drawn over a piercing tool by two external rollers set at an angle to each other that move the billet. At this point a “rough” tube has been formed. 　　The rough tube is put through an elongator, in which three rollers and an internal mandrel sh...

　　Stainless welded steel pipe is used for many different applications because of its non-corrosive surface, light weight, ease of cleaning and looks. You can use welded steel pipe well, because of stainless welded steel pipe is durable nature; there are few precautions to take when handling stainless welded steel pipe. There are, nevertheless, some suggestions to stick to be positive you get the most out of people pipes. The first step, you can wipe the stainless metal pipe along with a clear rag and cozy drinking water to eliminate any dirt and essential oil from the surface area. Dirt and essential oil can influence the corrosiveness of the pipes, so it is crucial to eliminate them prior to set up. Soon after the pipe has been wiped along, rinse it with drinking water and dried out the pipe with a clear cloth. 　　Then put on cloth or rubber gloves when managing stainless metal pipes to stay clear of leaving finger essential oil on the surface area of the pipe. If any finger essentia...

　　Steel pipe is a kind of hollow long steel, which is used as a pipe for conveying fluids, such as petroleum, natural gas, water, gas, steam, etc. In addition, when the bending and torsional strength are the same, the weight is light, so it is also widely used. Used in the manufacture of mechanical parts and engineering structures. Also used to produce a variety of conventional weapons, barrels, shells and so on. The approximate differences between welded and seamless pipes are as follows: 　　1. In appearance, the difference between seamless steel pipe and welded steel pipe is that there are welding bars on the inner wall of the welded pipe, while there are no seamless steel pipes. 　　2. The pressure of the seamless pipe is higher, the welded pipe is generally about 10 MPa, and now the welded pipe has been seamlessly processed. The seamless steel pipe is perforated with a solid round pipe. Without a gap, the welded pipe is a steel pipe made by welding a steel plate or a strip steel a...

　　Pipeline bear the effects of the pipeline transmission medium pressure and temperature, but also suffer from a variety of delivery through the heart of the impact of natural and human factors that may occur in the course of leaking or breaking all sorts of accidents. Not only due to leakage of pipeline accidents affect transport caused economic losses, but also pollute the environment. To ensure the safe operation of the pipeline and generate pipeline accident prevention should be the design, construction and operation of three aspects, including design and reasonable choice of pipe is very important. As for the pipe, the strength, toughness and weldability are three basic quality standards. It should also consider the environmental and transport medium for pipe corrosion, corrosion-resistant steel choice. 　　(1) Mechanical properties: The main indicator to measure the mechanical properties of the pipe have strength, yield limit, elongation, etc. 　　① Tensile strength: tube in a te...

　　In the lsaw steel pipe production process, because the primary process is in a hot state, so the heating operation is resolution product quality is very important process. 　　The heat with the furnace, according to their results, and reheating furnace is divided into two kinds; the former is used to billet heated from room temperature to the processing temperature; the latter is used in the process in the blank reheated to the required processing temperature. 　　Heating will be wrong in the outer surface of the tube surface may exhibit cracks, folds and migraine pain and other waste reason. 　　Furnace There are many ways, but the primary use is a ring furnace. This furnace has an annular hearth, it can slowly change the direction of the diameter of the blank along the bottom of the load from the entrance, a reversal can be used at the outlet of the heating and soaking temperature to the rule kind of stove. This operation is the key blank is heated uniformly heated to a temperatur...

　　Straight seamless steel pipe wall thickness control is a difficult production. At present, the straight seamless steel pipe manufacturers to improve the wall thickness in the production of precision uses the methods generally including: 　 　1, Tube heating 　　Heating to the average to prevent rapid up and down temperature. Each take-off and landing temperature is to maintain a smooth slow, the maximum rise and fall temperature does not exceed 30 ℃. 　 　2, Rolling mill mandrel 　　Average wall thickness of thick wall tube and solid billet make the probability of mandrel bending deformation significantly reduced, can effectively improve the wall thickness of the precision. 　　 3, The accuracy of mandrel 　　The outer core of the machining accuracy control in ± 0.1mm, mandrel straightness bias does not exceed 5mm. Welding, the two core rods between the piercing a finishing pin positioning, welding in order to avoid the formation of the total straightness bias is too large. 　　4, Th...

　　As excellent pipe manufacturer from China, Great Steel Pipe have some methods to control the quality of pipe bend. 　　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 specifications required to control a certain range of tolerance, but also requires the user in accordance with the use of ...

　　The internal cut of the large-diameter steel pipe is caused by the unsatisfactory design of the head and the sharp-edged protrusion on the connecting rod connecting the plug, or the welding of metal points and the like, which is caused by scratching the inner surface of the capillary tube. The design of the head is unreasonable. For example, the rounded corners of the reverse cone are too small and the edges are sharp, which will also scratch the inner surface of the capillary. 　　If the taper angle of the head-rolling section is not consistent with the taper taper angle of the roll and the head is of poor quality or the head surface is defective, the inner surface may be scratched. Improper adjustment of the mill will exacerbate the occurrence of such defects, which are spirals, commonly known as inner spirals. The internal cut of the spiral steel pipe sometimes appears on the homogenizer, and the causes are different. Slightly rounded internal cuts can be eliminated by later defor...

　　Welding is vital for the quality of the high frequency welded pipe . Since the high frequency influence the distribution of current in the steel plate, high frequency welding frequency has a great influence to welding. 　　Selecting high frequency or low frequency welding is mainly influence the welding heat affected zone size.From the point of efficiency of welding, pipe manufacturers should as far as possible to use higher frequency.100 KHZ high frequency current can penetrate ferritic steel 0.1 mm, but can only through the 0.04 mm 400 KHZ, which means that the latter current density distribution on the surface of the steel plate is nearly 2.5 times higher than the former one. 　　In the production practice, the welding manufacturers generally selected 350 KHZ to 450 KHZ frequency welded carbon steel material.When welding alloy steel material, welding more than 10 mm thick steel plate, pipe manufacturers can use 50 KHZ to 150 KHZ frequency, because of alloy steel containing chromiu...

　　In the oil (gas) pipeline anti-corrosion construction process, the surface treatment of high-frequency welded steel pipe is one of the key factors to determine the useful life of the pipeline. It is the premise that the erosion resistant coating can be firmly bonded to the steel pipe . According to the research institutions, the life of the erosion resistant coating depends on the coating type, coating quality, construction environment and other factors. The surface treatment of steel pipe accounted for about 50% on the life of the erosion resistant coating. 　 　1. Pickling 　　Generally, we use chemical and electrolytic two methods for pickling treatment. Pipeline corrosion only uses chemical pickling, which can remove the oxide, rust and the old coating. And sometimes it can be used as a re-treatment after derusting by sandblast. Although using chemical to clean the surface can achieve a certain degree of cleanliness and roughness, but the anchor is shallow, and it easy to cause p...

　　We all know that the individual quality of SSAW steel 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 SSAW steel pipe. Today, we need to carry out a comprehensive solution to the knowledge of anti-corrosion technology of SSAW steel pipe. 　　The toolrust-removal of SSAW steel 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 the surface...