ERW Steel Pipe

　　Different steel pipe, both seamless pipes and welded tube like ERW steel pipe , will be applied in various situations. There will be different steel pipeline’s standards in the pipe field for multifarious usage. 　　Thus, there are different demands for pipes. It is very important to know what's your application before ou inquiries. Here, we would like to compare three tubes from standard aspect. 　　API 5L: PSL 1and PSL 2 would be the normal type for this category. Whether seamless or welded type, API 5L can meet our demands with international standard requirements. 　　ASTM A53: Another popular steel pipe among engineering project. It contains from pipe, steel, black, hot-dipped and zinc-coated, welded and seamless. Generally speaking, customers will use them among mechanical and pressure applications. 　　EN10219: Used for cold formed welded structural hollow sections of non-alloy and fine grain steels, this type tube is also popular among clients.

　　In fact, it’s very important for us,we all know that we can do lots of things with steel pipe. From welded tube like ERW steel pipe to seamless type, we shall apply them among construction and other industries almost every minute. 　　Steel pipe industry is resource type industry, which transfers natural materials, such as ironstone, coal, etc, into steel able to be used directly. The shortage of natural resources and energy is one of the main barriers for the development of steel industry. Approximately half of Chinese steel consumption is in construction, most of which is for property development. The major contradiction faced today for the sustainable development of steel industry lies in the bottleneck of resources and the overburden of environment. 　　More importantly, any country cannot create profits if it wastes all of its natural resources. It is very urgent for human being to treasure and economize resources. Hereby, advocating the moral idea of thrift is the inevitable c...

　　We are familiar ERW steel pipe due to its wide application all over the world nowadays. Today, our topic would focus on the different standards for this pipeline and its application according to various characters. 　　1. API 5L Line Pipe for oil and gas, and we can provide different categories here. 　　2. ASTM A53 standard specification for steel pipes. ASTM steel tube has multifarious standards and you can ask for detailed information if you are interested in this type. 　　3. Black and Hot-Dipped, Zinc-Coated Welded and Seamless. No matter welded or seamless steel pipe, it is not a big problem once you purchase here in our company. 　　4. EN10217 Welded steel tubes for pressure purposes. Technical delivery conditions. Talking about pressure, low, middle and high pressure transmission tubes, you can have a look here. 　　5. Non-alloy steel tubes with specified room temperature properties. Non-alloy or alloy steel pipeline is also in our production range.

　　Welded tube, used among gas transmission, can be classified into two kinds: spiral welded pipe and straight seam welded pipe. Today, we’d like to have a basic analysis for this pipeline. 　　For the categories of this type tube, spiral welded pipe would be divided into low carbon structural steel pipe and low alloy structural steel strip. For example, primesteeltube company would offer customers both of them with OD 219.1mm to 3500mm. Thus, clients have lots of choices depending on their requirement on specific engineering project. 　　Talking about application, spiral welded pipe is mainly spiral submerged arc welded pipe (SSAW), widely used in various gas pipeline construction, the specifications with the outer diameter, wall thickness said.

　　Hot reheat steam pipeline; three of the four major pipelines: cold reheat steam pipeline (two high temperature and high pressure steam pipelines between the high pressure cylinder exhaust port and the reheater inlet header interface); four of the four major pipes: high pressure feed water Pipeline (high-pressure boiler supply water pipe between the electric feed pump outlet and the economizer inlet header interface). Supply T92 cold reheat steam main,four large pipelines, small diameter 15CrMo seamless pipe, the implementation of the standard GB5310-2008, DIN17175, etc., commonly used in power plants, power equipment and other high-pressure boilers and pipelines seamless steel pipe. The main materials are ST45.8-III, 20G, 15CrMo, 12Cr1MoVG and so on. 　　Casing pipe refers to steel or steel strip processed into various types of steel at room temperature after cold drawing, cold bending, cold drawing and other cold working. Advantages: fast forming speed, high output, and no damage to...

　　The application of thick-walled seamless steel pipes in pipelines in recent years is very large, and it can be said that there are huge applications. In pipeline applications, because of the large amount of liquids with relatively high viscosity, the unique wear resistance is reflected. What are the characteristics of the wear resistance of thick-walled seamless steel pipes? Let's talk about it today. Let me talk about this issue. 　 　1. High wear resistance: 　　The thickness of the wear-resistant layer of thick-walled seamless steel pipe is 3-12mm, the hardness of wear-resistant layer can reach HRC58-62, the wear resistance is 15-20 times higher than that of ordinary steel plate, and the performance of low-alloy steel plate is 5-10 times higher than that. The wear resistance of chrome cast iron is 2-5 times higher, and the wear resistance is much higher than that of spray welding and thermal spraying. 　 　2. Better impact performance: 　　Double-layer metal structure, metallu...

　　In the anti-corrosion construction process of oil and gas pipelines, the surface treatment of seamless steel pipe is one of the key factors determining the service life of pipeline anti-corrosion. It is the premise of whether the anti-corrosion layer and the seamless steel pipe can be firmly combined. According to research by professional research institutes, the life of the anti-corrosion layer depends on the type of coating, coating quality and construction environment. 　　The surface treatment of seamless steel pipe affects the life of the anti-corrosion layer by about 50%. Therefore, whether it is seamless tubes or welded pipes shall be strictly in accordance with the requirements of the anti-corrosion layer specification on the surface of steel pipes, and the surface treatment methods of steel pipes shall be continuously improved. The main methods of seamless steel pipe de-embedding are as follows: 　　 1. Cleaning 　　Solvents and emulsions are used to clean the surface of st...

　　Generally, stainless steel seamless pipes are subjected to a pickling passivation process. In order to make the surface texture better and the appearance is more clean and beautiful, there is a key step in the pickling passivation process, which is also very error-prone, that is, chemical degreasing. Steps, once the operation is wrong, the surface of the seamless pipe will not be completely degreased, which will not only affect the appearance but also affect the texture. Therefore, we will focus on the precautions for chemical degreasing: 　　1. Chemical degreasing adopts the foaming method in the tank, the oil removal tank is made of steel plate, and the inner wall is covered with PVC or polyethylene. 　　2. Stop the chemical degreasing treatment with 12~15% nitric acid (by volume). The temperature is 40 °C~60 °C, and the time is 2~4 hours. 　　3. When the stainless steel seamless tube is immersed in the tank, pay attention to the position where it is placed, and leave air in the t...

　　The thick-walled seamless pipe cold extrusion technology has the following advantages: 　　1. Extrusion parts size accurate surface smoothness: At present, the cold extrusion parts developed in China generally have a dimensional accuracy of 8 to 9 grades. If the ideal lubrication is used, the precision is second only to the fine polished surface. Therefore, parts manufactured by the cold extrusion method generally do not need to be reworked, and a small amount only needs to be finished (grinding). 　　2. Saving raw materials: The material utilization rate of cold extrusion parts can usually reach more than 80%. For example, the utilization rate of the piston machining material of the Jiefang brand automobile piston is 43.3%, and the material utilization rate is increased to 92% when the cold extrusion is used; and if the universal joint bearing sleeve is changed to cold extrusion, the material utilization rate is from the past. 27.8% increased to 64%. It can be seen that the product...

　　Heat treatment of seamless steel tubes is a process for improving the properties of metal materials and their products. Depending on the purpose, the material and its workpiece are heated to a suitable temperature, insulated, and subsequently cooled in different ways to change the internal structure to achieve the desired properties. The heat treatment of seamless steel tubes is generally divided into annealing, normalizing, quenching, tempering, failure, and chemical heat treatment and vacuum heat treatment. By heat treatment, the use efficiency or life of the steel can be improved, and in some cases, the cheaper general metal material can be replaced by the more expensive special material. The basic methods of heat treatment of seamless steel tubes mainly have the following four forms: 　　 1. Annealing 　　Annealing is a process in which a seamless steel tube is heated to a slightly higher or lower critical temperature for a period of time (ie, heat preservation) and then slowly c...

　　The thick-walled seamless pipe cold extrusion technology has the following advantages: 　　1. Extrusion parts size accurate surface smoothness: At present, the cold extrusion parts developed in China generally have a dimensional accuracy of 8 to 9 grades. If the ideal lubrication is used, the precision is second only to the fine polished surface. Therefore, parts manufactured by the cold extrusion method generally do not need to be reworked, and a small amount only needs to be finished (grinding). 　　2. Saving raw materials: The material utilization rate of cold extrusion parts can usually reach more than 80%. For example, the utilization rate of the piston machining material of the Jiefang brand automobile piston is 43.3%, and the material utilization rate is increased to 92% when the cold extrusion is used; and if the universal joint bearing sleeve is changed to cold extrusion, the material utilization rate is from the past. 27.8% increased to 64%. It can be seen that the producti...

　　The seamless steel pipe is a hollow section steel. The hollow pipe means that the steel pipe is hollow. It is for this reason that the seamless pipe is used in a large amount in transportation, and the steel pipe has been passed. The seamless treatment and the precision of the pipeline are also very good, so that users can use the seamless steel pipe more conveniently in transportation, such as transportation of oil, natural gas, tap water and so on. 　　When the seamless steel pipe and the ordinary solid steel pipe are in many aspects the same, the weight of the former is very light, which makes it a new economical steel, so it is used in the manufacture of parts and mechanical parts. Oil drill pipe, bicycle frame, barrel and so on. Moreover, the use of seamless steel pipe can improve the material utilization rate without the waste of raw materials, and the production process can be simplified. For example, the current jacks, rolling bearing rings and the like are all made using se...

　　 Seamless steel pipes and welded pipes are mainly formed by different molding processes. Ordinary steel pipes, such as tap water pipes, are usually welded by bending the flat plate. You can find a weld on the top; the coarser diameter is usually a spiral weld. The seamless steel pipe is generally formed by laminating molten steel in a molten state through a ring slit and then being subjected to a stretching process, so that there is no weld. 　　In terms of performance, especially the pressure bearing capacity is greatly improved compared with ordinary steel pipes, so it is often used on high-voltage equipment. Such as the piping connection of hydraulic equipment. The weld joint of ordinary steel pipe is its weak link, and the weld quality is also the main factor affecting its overall performance. People who have lived in the north generally have experienced the experience of freezing water pipes or heating pipes in the winter. The places where the explosions are usually welded. 　...

　　Hot-dip galvanized steel pipe: reacts a molten metal with an iron matrix to produce an alloy layer, thereby combining the substrate and the plating layer. Hot-dip galvanizing is to pickle the steel pipe first, in order to remove the iron oxide on the surface of the steel pipe, after pickling, it is washed by ammonium chloride or zinc chloride aqueous solution or a mixed aqueous solution of ammonium chloride and zinc chloride, and then fed. Hot dip plating tank. 　　Hot-dip galvanizing has the advantages of uniform plating, strong adhesion and long service life. The complex physical and chemical anti-galvanized steel pipe of the hot-dip galvanized steel pipe base and the molten plating solution shall form a corrosion-resistant structure of a zinc-iron alloy layer. The alloy layer is integrated with the pure zinc layer and the steel pipe base. Therefore, its corrosion resistance is strong. 　　Hot-dip galvanized seamless steel pipe : the galvanizing amount is very small, only 10-50g/m2...

　　There are more than 60 sets of extrusion units in the world. Except for a few for profile extrusion, 70% of the units are used for the production of steel pipes. The main type is stainless steel pipes . Compared with the rolling (longitudinal and cross-rolling) production methods, the extrusion method is characterized by three-way compressive stress during metal deformation. Under this optimal stress state, for stainless steel tubes with large steel numbers and large deformation resistance, good deformation, internal and external surface quality and metallographic structure can be obtained. 　　The improvement of the vertical hydraulic perforation process equipment can make the deviation accuracy of the wall thickness of the waste pipe after extrusion reach 5%~7%. The extrusion die is simple, easy to manufacture and replace, and is suitable for the production of small batch and multi-size stainless steel pipes. The extrusion unit can also produce steel pipes with a wide range of spec...

　　(1) For pipelines with high peaking requirements, the user's gas consumption is very uneven, the pipeline pressure fluctuates frequently, and the alternating stress of the steel pipe is large. The existing defects in the pipe will expand under the alternating stress. The use of spiral welded steel pipes with many welds and high probability of defects will not guarantee the operation of the pipeline. 　　(2) The pipeline crosses the seismic fault zone or passes through the local high-intensity seismic zone. Due to the frequent geological activities of these sections, longitudinal or axial alternating stress will be generated on the pipeline. There are many spiral welds and the probability of defects is higher than that of straight seam submerged arc welded steel tubes. Under long-term stress, the probability of accidents in spiral welded steel pipes is much higher than that of straight seam submerged arc welded steel pipes. Therefore, straight lines should be used in this area. Su...

　　The main processing methods for longitudinally submerged arc welding pipe are: 　　Forged steel: A pressure processing method that uses the reciprocating impact of a forging hammer or the pressure of a press to change the billet to the shape and size we need. 　　Extrusion: It is a steel processing method in which a metal is placed in a sealed extrusion, and pressure is applied at one end to extrude the metal from a prescribed die hole to obtain a finished product having the same shape and size, which is mostly used for producing non-ferrous metal steel. . 　　Rolling: A method of pressure processing in which a steel metal billet is passed through a gap (various shapes) of a pair of rotating rolls, and the material cross section is reduced by the compression of the rolls, and the thick-walled straight-slit steel pipe is increased in degree. 　　Pulling steel: It is a processing method in which the rolled metal blank (type, tube, product, etc.) is pulled through the die hole to reduc...

　　After the sinking drawing, the outer surface area of the spiral steel pipe manufacturer is increased, and the surface area of the inner surface is reduced, so a neutral layer appears between the inner and outer surface layers, and the outer surface and the neutral layer and all layers between them is increased, but the outer surface is the largest increase. The inner surface and the neutral layer have the largest reduction in the inner surface. 　　The above-mentioned changing properties of the surface area of each layer of the spiral steel pipe manufacturers during the emptying process affect the non-uniformity of the metal deformation. One of the characteristics is that the natural extension of each layer along the pipe wall is inconsistent. The outer surface layer of the spiral steel pipe manufacturer is the smallest, the inner surface layer of the spiral steel pipe manufacturer is the largest, and the inner layer of the inner layer is naturally extended from the outer surface. Th...

　　Brief introduction of spiral steel pipe technology is as follows: 　　The first: Appearance quality 　　1. There should be no cracks, knots, folds, and other defects on the surface that exceed the nominal wall thickness deviation. 　　2. There should be no craters with a depth of more than 6.4 mm. The length of the pit should not exceed 0.5D. 3. The height of the welded steel pipe should be less than or equal to 3.5mm. 　　The second: Outer diameter and wall thickness requirements 　　1. The nominal nominal diameter and nominal wall thickness of the pipeline shall meet the relevant requirements of SY / T6475. 　　2. The deviation of the outer diameter of the pipe should meet the requirements of Table 1 on page 2 of SY / T5037-2012. 　　3. The thickness deviation of the pipe wall should meet the requirements of Table 2 on page 2 of SY / T5037-2012. 　　4. Tube ellipticity requirements: In the range of 100mm length of the pipe end, the maximum outer diameter should not be 1% larger th...

　　We would only say we need seamless steel pipe several decades ago once we have discussion for oil drilling. With advanced technology, now we would be fond of ERW steel pipe for oil drilling and oil well too. Why? High quality welded steel pipe can be used for it too. 　　Compared seamless tube, ERW casing tube for oil drilling would have advantages of high dimensional accuracy, weld toughness, anti-extrusion of high-performance, and low cost advantages. We can see details below. 　　High dimensional accuracy. By control of mechanical sizing process, now for molding, precision, ERW steel pipe has its merits of thickness standard deviation of <0.10 mill corresponding seamless casing standard deviation was 0.41 mill. 　　Nice weld steel pipe’s toughness. Once we get the C, S and P content lower in the component organization, then we will get the high strength and toughness for the weld. Thus we can make the quality better than before. 　　Advancement on quality control. ERW sleeve ba...