steel pipe

　　When talked about seamless steel pipe with carbon type, we would take ASTM into account. Today, we would have a list for the comparison for their functions so that we can have a better choice next time when we need to purchase them. 　　There are ten types of the ASTM seamless carbon steel pipe for various work environment. 　　ASTM A53: As structural steel or for low-pressure plumbing; 　　ASTM A106 : Seamless carbon steel pipe for high-temperature service; 　　ASTM A335 : Seamless ferritic alloy-steel pipe for high-temperature service; 　　ASTM A213 : Seamless ferritic and austenitic alloy-steel boiler, superheater, and heat-exchanger tubes; 　　ASTM A179 : Seamless cold-drawn low-carbon steel heat-exchanger and condenser tubes; 　　ASTM A192 : Seamless carbon steel boiler tubes for high-pressure service; 　　ASTM A210 : Seamless medium-carbon steel boiler and superheater tubes; 　　ASTM A333 : Seamless steel pipe for low-temperature service and other applications with required no...

　　No matter seamless steel pipe or welded pipeline, we should have check methods for the final products in order to guarantee the quality. Here are three main points for the tube’s inspection process. 　　There is no cracks, lack of fusion, porosity, slag and spatter for the welded joint’s surface. As these drawbacks would finally have big influence for the good quality of a steel tube. Pipeline design temperature is below -29 degrees, fan ruler of hardened stainless steel and alloy steel pipes tend to be larger weld surface, without undercut. 　　Nondestructive test is necessary on the pipe’s surface. Different steel pipe with various functions should take different pressure taking. Thus, magnetic iron pipe should be used in magnetic particle testing; non-ferromagnetic steel should be used in penetration testing. 　　Ray inspection and ultrasonic testing. Ray inspection and ultrasonic testing is the main target of the butt joint pressure pipe and pipe fittings for butt joints.

　　Anna’s father is a steel pipe manufacturer and there are many steel pipes stories among her family. Today, our main topic is listening these stories from her father and learning lesson from these stories. Which kind of story is your interest? ERW steel pipe concerned or seamless one? Let’s go! 　　We can manufacture high quality steel pipe so long as we have enough advanced technology. With the time goes by, her father said that we have to keep up with the development of technology, or we will game over. Twenty years ago, her father would be happy as they just need to produce steel pipe, no concern for the packing or other problems. However, now we will do foreign business and the communication, standards, and packing problems are our lesson to learn. 　　Of course, we know service is important from the beginning of the business. So we have keep up with the trend of good service all the time.

　　Talking about seamless steel pipe , flaring and flattening would be here. And which kind of factor would associate with this production process? Today, we’ve listed them here for our customers. 　　First of all, carbon content of the steel would be one of the affecting factor. The lower of the carbon content in steel pipeline, with the low sulfur and phosphorus content, we will have perfect quality for the steel tubes. 　　For ferrite based alloy steel pipe, if the chromium content ranges from 11%~30%, we will get a body centered cubic crystal structure. Thus, this kind of steel with high heat conductivity, thermal expansion coefficient is small, good oxidation resistance and so on. 　　Of course, the secondary refining technology ( AOD or VOD ) can be used to make carbon, nitrogen, gap elements are greatly reduced, thus making this kind of steel is widely used. 　　For more detailed information, welcome to have a discussion here.

　　I have never thought about this question that the steel pipes, from seamless steel pipe to welded type, vanish in the world, because we use them almost everywhere. Thus, I even cannot image the life without steel pipe. 　　In our daily life, we use them to transport gas to heat things; transport water, hot or cold, to wash things; convey the rainwater to keep free-flowing on roads and other places. In industry, we use them for firming the foundation of a building; and we use them for manufacturing, transport the less pressure liquid like factory equipment cooling water; besides, we can also use them to make furniture. 　　The ERW steel pipe , seamless steel pipe, stainless steel pipe are necessities in the world. Currently, we have a total capital of RMB500 million, annual comprehensive output of 200,000 tons only in China, so we can learn that there is a massive need for the steel pipe. If there is no steel pipe in the world, there is no such kind of rugged system to transport water...

　　The thick-walled seamless steel pipe production line is characterized by long production line, many transmission equipment, strict tension control requirements, easy deviation of the strip, and continuous production. During the finish rolling process, the local area enters the upper limit of the non-recrystallization zone and the two-phase zone of the austenitic seamless steel pipe manufacturer in advance. The size and uniformity of the ferrite grains obtained by rolling in the non-recrystallization zone are related to the total deformation amount and the pass reduction rate at the rolling stage. 　　When the total deformation amount and the pass reduction ratio are larger, the ferrite is obtained. The finer and evener the body grains. The local area, that is, the crack opening and the middle part thereof, enters earlier than the base side due to supercooling, so the ferrite grains of the crack at the opening are finer, the grain size of the matrix is ??not changed much, and the dif...

　　The outstanding feature of thick-walled seamless steel pipe is its strong pressure resistance, and it can be transported by various liquids and gases. So how is the carrying capacity of thick-walled seamless steel pipes improved? The following is a detailed introduction for everyone. 　　In layman's terms, thick-walled seamless steel tubes can carry weight indirectly. It is generally believed that cabinets are also best not to hang on light-weight walls, but for light-weight walls that have been tiled, because cement can enhance the load-bearing capacity of the wall, the cabinet can be hung on the wall even without special treatment. . However, for the sake of insurance, it is best to deal with the wall. The method of treatment is to first coat a thick-walled seamless steel pipe on the wall, then smooth it with cement mortar, and finally seal it with gypsum board. 　　However, the safest method is to use a special hanger to secure the thick-walled seamless steel cabinet to the f...

　　 Seamless steel pipes are now widely used in the market, and there are many problems to be aware of during use. Many people are most concerned about how to improve the utilization rate of seamless steel pipe during use. Let me introduce the method in detail. How can we improve his utilization rate to the maximum value, how can we make better use of seamless steel pipe, first of all, we must strive to improve the process of seamless steel pipe production, to maximize its service life. 　　The seamless steel pipe produced is not the same material, and the elements are naturally different. In general, our seamless steel pipes are not easy to rust. But it is not to say that since the seamless steel pipe is not easy to rust, we usually don't care about it. We can sit back and let us sit back and relax. Because the seamless steel pipe cleavage usually does not pay attention to maintenance, its service life will be shortened, and it will bring unnecessary losses to our seamless steel p...

　　The so-called seamless steel tube yield strength refers to the yield limit when the seamless steel tube yields, that is, the stress against the slight plastic deformation. External forces greater than this limit will permanently disable the part and will not recover. 　　The external factors that affect the yield strength of seamless steel tubes are: temperature, strain rate, and stress state. As the temperature decreases and the strain rate increases, the yield strength of the material increases, especially the body-centered cubic metal is particularly sensitive to temperature and strain rate, which leads to low temperature embrittlement of the steel. The effect of the stress state is also important. Although the yield strength is an essential indicator of the intrinsic properties of the material, the stress state is different and the yield strength values are different. 　　The intrinsic factors affecting the yield strength of seamless steel tubes are: bonding bond, organization, s...

　　The same is a large-diameter seamless steel pipe , but in the use of the product, there will be a difference in the relative use, then in the use of this product, because of their own quality gap, in use, there will be what is the difference? 　　First of all, it is the adaptability difference in the use environment. In the use of products, there are often downline manufacturers who do not meet the requirements on this product. In such cases, it is naturally difficult to Users will be satisfied when they are using. 　　Because some environments are more serious in corrosion, but manufacturers do not use anti-corrosion materials in production, or they do not have the advantages they deserve in other people. Therefore, there is no quality on large-diameter lsaw pipes. At the same time, there is also a relative difference in the tension that it is subjected to, so this is what the user needs to pay attention to. Of course, there is another problem, that is, In the production of products...

　　The surface heat treatment technology of the 45th thick-walled seamless steel pipe is constantly being innovated, and the current technology has been developed more and more sophisticated. Let's take a look at several methods of 45-thick thick-walled seamless pipe processing. 　　 1. Surface hardening: 　　Rapid heating of No. 45 thick-walled seamless pipe by different heat sources, when the surface temperature of the part reaches above the critical point (when the temperature of the 45# seamless pipe core is below the critical point), it is quickly cooled, so that 45# seamless The surface of the tube is hardened and the heart remains in its original tissue. The most widely used in the industry is induction heating and flame heating surface quenching. 　 　2. Chemical heat treatment: 　　The 45# seamless tube is placed in a medium containing active elements to heat and keep warm, so that the active atoms in the medium penetrate into the surface layer of the 45-thick thick-walled...

　　When the seamless steel tube is tempered at 650 °C, its impact toughness value is the lowest, that is, the temper brittle zone, so it is not suitable to temper in this temperature range. It should be noted that the Wuxi seamless steel pipe is quenched below 1100 ° C, and the medium grain of 4-6 grade is obtained, and there is no secondary hardening peak. When the temperature exceeds 1150 ° C, the crystal grain grows obviously. In addition to the above strict control, seamless steel pipe needs to be extended. 　　After the perforation of the seamless steel pipe, the dimensional accuracy of the capillary tube, the internal and external surface quality and performance can not meet the requirements of the product technical standards, and must be further processed to meet the requirements. The purpose of the extension process is to reduce the wall thickness of the seamless steel tube to make it close to or meet the requirements of the finished product. 　　At the same time, the extension...

　　The thermal expansion seamless steel pipe adopts the expansion technology of the original pipe. The expansion is a pressure processing process that uses hydraulic or mechanical means to force the steel pipe to expand outward along the radial direction. The mechanical method is simpler and more efficient than the hydraulic method. The world's most advanced large-diameter seamless steel pipe pipeline expansion process is adopted. The process is: 　　The mechanical expansion diameter is expanded in the radial direction by the segmented fan-shaped block at the end of the expanding machine, so that the tube blank is stepwisely formed in a stepwise manner to realize the process of plastic deformation of the entire pipe length, thereby producing a thermally expanded seamless steel pipe. It is divided into 5 phases: 　　1. Initial rounding stage: The fan-shaped block is opened until all the fan-shaped blocks are in contact with the inner wall of the steel pipe. At this time, the radius ...

　　PE coated steel pipe, whether used for water supply like ERW steel pipe or oil transmission like seamless tube, is popular for customers nowadays. There are five common reasons to purchase this kind of tube. 　　PE coated steel pipe has three classifications which are PE Coated Pipe, 2PE Coated Pipe, and 3PE Coated Pipe. The advantages by using them are: 　　Strong protective layer: With coated process, you would laud the protective function for the steel pipeline. 　　Long term chemical and mechanical resistance: Due to the layer, it will elucidate the long term effect for the steel tube. 　　High mechanical impact strength and penetration resistance: Same reason with the second point, and you will find that the pipe would be tardy in working environment. 　　Increases life span of pipes more than 25yers. 　　Economy in the long term due to less repairing/re-working. 　　 http://www.xysteelpipe.com/info/Five-reasons-to-choose-PE-coated-steel-tubes-1288-1.htm

　　A steel pipe with no joints on the outer surface made of a single piece of metal is called a seamless steel pipe . According to the production method, the seamless pipe is divided into a hot rolled pipe, a cold rolled pipe, a cold drawn pipe, an extruded pipe, a top pipe, and the like. According to the shape of the section, the seamless steel tube is divided into two types: a circular shape and a special shape. The shaped tube has a plurality of complicated shapes such as a square shape, an elliptical shape, a triangular shape, a hexagonal shape, a melon shape, a star shape, and a winged tube. The maximum diameter is 650mm and the minimum diameter is 0.3mm. Depending on the application, there are thick-walled tubes and thin-walled tubes. Seamless steel pipes are mainly used as petroleum geological drilling pipes, cracking pipes for petrochemicals, boiler tubes, bearing tubes, and high-precision structural steel tubes for automobiles, tractors, and aviation. 　　Classification: Jointl...

　　The main types of lsaw steel pipes for automobiles include automobile automobile silencer pipes, transmission shaft pipes, thrust pipes, condenser pipes, exhaust pipes, steering shaft pipes, and shock absorber oil storage pipes. 　　The lsaw steel valve plate is composed of a vertical plate, a backing plate and a large round steel plate. The valve plate of this structure, the pad battle station board can be indirectly cut, and the small square steel plate requires the craftsperson to first calculate the blanking size, and then press the required shape to make the shaped tire, and the tire will be used. The small square steel plate is repressed and formed. The middle part of the valve plate is curved, and the edge is not a flat surface. Then it is necessary to make a tire for each specification valve, otherwise it is impossible to press out the required shape. The connecting butterfly valve butterfly valve has the advantages of old volume, heavy weight, flexible measures, convenient ...

　　 LSAW steel pipes have several flaw detection tests. LSAW steel pipes are now used more and more widely. According to different projects, the standards for using steel pipes are also different. Generally speaking, steel structures, piling, sewage discharge pipes, etc. There is no requirement for flaw detection of steel pipes, no need for flaw detection, and the projects used for flaw detection are: natural gas pipelines, oil pipelines, fire pipelines, etc. These projects have extremely strict requirements for flaw detection, and some strength flaw detection standards are related to The safety of the project is even related to the safety of people's lives. 　　There are two types of flaw detection that are most widely used. One is ultrasonic flaw detection. This type of flaw detection is to use ultrasonic energy to penetrate into the depth of the metal material and to reflect at the edge of the interface when one section enters another section. A method of part defect, when the u...

　　According to different production methods, seamless steel pipe production process can be divided into hot rolled pipe, cold rolled pipe, cold drawn pipe and extruded pipe. 　　1. Hot-rolled seamless pipes are generally produced on automatic rolling mills. The solid tube blank is inspected and the surface defects are removed, cut into the required length, centered on the end face of the perforated end of the tube blank, then sent to a heating furnace for heating and perforated on the punching machine. At the same time, the perforation is continuously rotated and advanced. Under the action of the roll and the head, a cavity is gradually formed inside the tube blank, which is called a capillary tube. It is sent to the automatic pipe mill for further rolling. Finally, the whole machine is uniform in wall thickness, and the sizing machine is sizing to meet the specification. The production of hot-rolled seamless steel tubes by continuous rolling mills is a more advanced method. 　　2. If...

　　The bearing capacity of a lsaw steel pipe is related to two points. One point is the mechanical properties of the steel, which is related to the commonly stated yield point, tensile strength, elongation and impact toughness. The other point is related to the geometrical characteristics of the section. Generally, a circular straight welded pipe has the strongest resistance to local buckling, and thus it is the best member to withstand radial internal pressure and radial external pressure. 　　Under the same steel number, equal area and the same supporting conditions, the rectangular slanted steel pipe has strong eccentric compression bearing capacity, and the circular and square steel tubes have the strongest compressive bearing capacity, but the square and rectangular lsaw steel pipes are subject to the ability of the nip to resist local buckling is not as good as that of a circular steel tube. Compared with the lsaw steel pipe, the seamless steel pipe has a complicated production p...

　　The seamless steel tubes are mostly medium-sized, high-carbon alloy steels. After quenching, some of the supercooled austenite is not transformed into martensite, and remains in the used state to become retained austenite, which affects the performance. If it is cooled below zero, it can promote the martensite transformation of the retained austenite. Therefore, the essence of the cold treatment is that the quenching continues. The quenching stress at room temperature is superimposed on the quenching stress at zero, and the cold treatment crack is formed when the refolding stress exceeds the strength limit of the material. 　　Precautionary measures: 　　(1) The seamless steel pipe is placed in boiling water for 30-60 minutes before quenching after quenching, which can eliminate 15%-25% quenching internal stress and stabilize retained austenite, then -60 °C Conventional cold treatment, or cryogenic treatment at -120 ° C, the lower the temperature, the more the retained austenite tran...