leah li

leah li
Website www.eastern-steels.com/
Member since Aug 16, 2022

by leah li on May 24, 2023



What is the weight calculation formula of seamless carbon steel pipe? In modern industrial production activities, steel structures are important basic components, and the type and weight of steel pipes selected will directly affect the quality and safety of buildings. When calculating the weight of steel pipes, carbon steel pipes are generally used. So, how to calculate the weight of carbon steel pipe (cs pipe)? 1. Carbon steel pipe weight calculation formula: kg/m = (Od - Wt) * Wt * 0.02466 Formula: (outer diameter - wall thickness) × wall thickness mm × 0.02466 × length m Example: carbon steel pipe outer diameter 114mm, wall thickness 4mm, length 6m Calculation: (114-4)×4×0.02466×6=65.102kg Due to the allowable deviation in the manufacturing process of steel, there is a certain difference between the theoretical weight calculated by the formula and the actual weight, so it is only used as an estimation reference. This is directly related to the ... Continue reading →

by leah li on May 23, 2023



The Benefits of Seamless Hydraulic Tube: A Comprehensive Guide Introduction Hydraulic systems are widely used in various industries, including manufacturing, construction, and transportation. These systems rely on the efficient transfer of fluids to generate power and control machinery. One crucial component of hydraulic systems is seamless hydraulic tubing. In this comprehensive guide, we will explore the numerous benefits of seamless hydraulic tubing and its importance in ensuring the smooth operation of hydraulic systems. What is Seamless Hydraulic Tubing? Seamless hydraulic tubing refers to a type of tubing that is manufactured without any welded seams. It is commonly made from materials such as stainless steel, carbon steel, or alloy steel. The seamless construction of the tubing ensures its integrity and strength, making it ideal for high-pressure hydraulic applications. Superior Strength and Durability One of the key advantages of seamless hydraulic tubing is its superior ... Continue reading →

by leah li on May 15, 2023



What are the general inspections of seamless steel pipes? For the finished seamless steel pipe, some inspections must be carried out before leaving the factory, such as the chemical composition of the steel pipe product, the dimensional accuracy of the steel pipe product, hydrostatic test, spectral flaw detection, etc. Similarly, when users of seamless steel pipe products purchase seamless steel pipes, they should also do some simple acceptance of seamless steel pipe products, check the production standards of steel pipe grades, check the specifications of seamless steel pipes, measure the dimensional accuracy of seamless steel pipes and The number of steel pipes. Inspection and acceptance. 1. Chemical composition Requirements are put forward for the content of harmful chemical elements As, Sn, Sb, Bi, Pb and gas N, H, O, etc., in order to improve the uniformity of chemical composition in steel and the purity of steel. In order to reduce the non-metallic inclusions in the tube billet ... Continue reading →

by leah li on May 10, 2023



ERW pipe manufacturing process and application Resistance welding (ERW Welded Pipe) is used to transport vapor and liquid objects such as oil and natural gas, and can meet various requirements of high and low pressure. Currently, it occupies a pivotal position in the field of transportation pipes in the world. Electric resistance welded pipe is produced by cold forming a sheet of steel into a cylindrical shape, then passing an electric current between the two edges of the sheet to heat the sheet to a point of force that forces those edges to form a weld. Initially no filler material is used, but a low frequency Alternating current heats the edges. This low frequency process was used from the 20's to the 70's. In 1970, the low frequency process was replaced by the high frequency ERW tube process, resulting in higher quality welds. Over time, it has been found that the welds of low frequency ERW pipes are prone to selective joint corrosion, hook cracks and insufficient joint ... Continue reading →

by leah li on May 9, 2023



Seamless steel pipe fracture treatment method Domestic high-precision seamless steel pipes generally improve the performance of materials by adding metal alloys. The seamless steel pipes after cold drawing need to be stress annealed to eliminate the residual stress of the material, improve the tissue material, and increase the plasticity of the material, so as to prevent The purpose of fracture failure of seamless steel pipe. At present, my country's stainless steel seamless pipes are all made of ordinary 45# or 20# steel 27SiMn steel, and the metal strength is improved through cold drawing deformation; however, this is at the expense of the plasticity and toughness of the metal. Precision cold-drawn seamless steel pipe is based on the market due to its high dimensional accuracy and high-strength performance. It must ensure that the deformation is within a certain range in order to maximize the performance of the material and reduce the negative impact on the material. If the ... Continue reading →

by leah li on May 8, 2023



What is the difference between welded pipe and galvanized steel pipe? Steel pipes are often used in engineering construction. There are many types of steel pipes. Among them, welded steel pipes and galvanized steel pipes are used more. What's the difference between the two? What problems should be paid attention to during construction? 1) The difference between welded steel pipe and galvanized steel pipe 1. Define the difference Welded steel pipes are made by bending steel strips (or steel plates) before welding, and seams are visible on the surface, while galvanized welded pipes are welded. Galvanized on a steel pipe basis. The purpose is to galvanize the general steel pipe (black pipe) to improve the corrosion resistance of the steel pipe. Welded steel pipe and galvanized steel pipe 2. Classification differences Welded steel pipes are divided into arc welded pipes, high frequency, gas welded pipes, furnace welded pipes, etc., and can be divided into straight seam and spiral ... Continue reading →

by leah li on Mar 23, 2023



Ultrasonic testing method for ERW pipe ERW pipe is made by using the skin effect and proximity effect of high-frequency current to rapidly heat the edge of the pipe to the welding temperature and then extrude and weld it. Compared with seamless steel pipes, ERW  pipes have the advantages of high dimensional accuracy, low price and high production efficiency, and their grain size and structure are better than seamless steel pipes. Compared with the straight seam submerged arc welded pipe (LSAW steel pipe) of the same specification, the production speed of ERW pipe is fast, and there is no local thinning of the anti-corrosion layer at the weld. Its fields of application involve casing used in oil drilling, subsea oil and gas pipelines in the offshore oil industry, oil and gas pipelines and gas distribution pipes for trunk lines and urban pipeline networks, etc. A variety of welding defects may appear in ERW pipes, some of these defects come from the base metal, and some are ... Continue reading →

by leah li on Mar 22, 2023



The octg casing adopts threaded direct connection, and the male end is connected with the female end. When connecting, whether the sealing performance of the threaded part of the casing is reliable is the key factor to ensure the normal production of the oil well. The sealing structure of the new threaded oil casing adopts metal-to-metal contact sealing, which does not cause clearance problems and has very reliable sealing performance; special threaded oil casings have been widely used in industrial equipment, especially in high-pressure oil and gas wells . However, these emerging threaded sleeves have very strict requirements on tightening torque. Generally, there are three values of maximum torque, optimum torque and minimum torque. The three values of different threaded oil casings are also different. Some special threads have a small range between maximum and minimum torque. In the actual oil casing operation, the tightening torque must be strictly within this range, if the ... Continue reading →

by leah li on Mar 20, 2023



  Sampling inspection of seamless carbon steel pipes In order to verify the technical performance of seamless carbon steel pipe), considering the requirements of the standard, it is necessary to carry out technical performance inspection on seamless carbon steel pipe samples. Process performance inspection mainly includes tensile strength, compressive strength, tensile strength, failure work, etc. Performance index inspection mainly includes extrusion flattening test, flaring test, compression test, wrinkling test, cold drawing test, perforation test, etc. . Such inspection items have certain choices according to the different specifications of CS seamless steel pipes and different application scopes. Non-destructive testing technology refers to the non-destructive testing of internal and surface defects of carbon steel seamless steel pipes. At present, magnetic flux leakage non-destructive testing, ultrasonic flaw detector, eddy current and fluorescent magnetic particle flaw ... Continue reading →

by leah li on Mar 15, 2023



Electric resistance welded tube is an acronym for Electric Resistance Welded. The welding method of ERW welded pipe is obviously different from that of submerged arc welded pipe. Unfilled metal is used for pressure welding without other components in the weld. The skin effect and proximity effect of the high-frequency current make the edge of the plate instantly heated to the welding temperature, and the weld seam is formed by the squeeze roller. High-quality seamless pipe requires on-line or off-line heat treatment of the weld to refine the weld area. High-quality electric resistance welded tube welds can achieve the same level of toughness as the parent metal, which is not possible with the submerged arc welding process. EFW is an abbreviation for Electric Saw Welding (EFW). It is a metal bonding process between the metal heated workpiece and the metal passing through one or more consumable electrodes, the metal arc and the filling material are completely melted, without ... Continue reading →

by leah li on Mar 14, 2023



  How to reduce the wear of ERW pipes in production and ensure the quality of welded pipes? From the analysis data of ERW welded pipe waste, it can be seen that the roll adjustment process plays a very important role in the production of welded pipes. That is to say, during the production process, if the rolls are damaged or severely worn, some rolls in the unit should be replaced in time, or the entire set of rolls should be replaced for continuous and full production of a certain type of welded pipe. When replacing the welded pipe, it is necessary to adjust the supporting roller accordingly to ensure the quality of the welded pipe. On the contrary, if the roll is not adjusted properly, it is likely to cause defects such as distortion, lap welding, edge undulation, indentation, scratches and even large ovals on the surface of the welded pipe and pipe body. The following is an introduction to the operation method of roll adjustment that should be mastered when changing rolls. In ... Continue reading →

by leah li on Mar 13, 2023



Seamless carbon steel pipe manufacturing process   The production process of general Seamless carbon steel pipes can be divided into two types: cold-drawn and hot-rolled. The production process of cold-rolled Seamless carbon steel pipes is generally more complicated than that of hot rolling. In the sizing test, if the surface does not respond to cracks, the pipe must be cut by a cutting machine and cut into a blank of about one meter in length. Then enter the annealing process. Annealing needs to be pickled with acidic liquid. When pickling, pay attention to whether there is a lot of blistering on the surface. If there is a lot of blistering, it means that the quality of the steel pipe does not meet the corresponding standards. In appearance, cold-rolled Seamless carbon steel pipes are shorter than hot-rolled Seamless carbon steel pipes. The wall thickness of cold-rolled Seamless carbon steel pipes is generally smaller than that of hot-rolled Seamless carbon steel pipes, but ... Continue reading →

by leah li on Mar 9, 2023



The surface quenching and tempering heat treatment of erw pipe is usually carried out by induction heating or flame heating. The main technical parameters are surface hardness, local hardness and effective hardened layer depth. Hardness testing can be performed using a Vickers hardness tester, a Rockwell hardness tester, or a Superficial Rockwell hardness tester. The selection of the test force (scale) is related to the depth of the effective hardened layer and the surface hardness of the ERW pipe. The Vickers hardness tester is an important means to detect the surface hardness of the heat-treated ERW steel pipe. It can test the surfacing layer as thin as 0.05mm thick, and the test force is 0.5-100kg. Highest precision, able to distinguish the surface hardness of heat-treated workpieces. small difference. In addition, the depth of the effective hardened layer is also detected with a Vickers hardness tester. Therefore, for units that carry out surface heat treatment or use a large ... Continue reading →

by leah li on Mar 7, 2023



1. Check whether the steel composition is uniform. Due to inferior seamless steel pipes, there are many impurities in the pipes and the steel density is low. Once we find that the composition of the pipe is disordered from the section of the pipe, then this must be a qualified seamless steel pipe. 2. It is a poor-quality seamless steel pipe, and the size deviation is very serious. Therefore, we can use a vernier caliper to check the size of each part of the steel pipe to see if it meets the standards for seamless steel pipes. If there is no vernier caliper, we can check the steel pipe.    3. The inner diameter of inferior seamless steel pipes fluctuates greatly, while the inner diameter of qualified seamless steel pipes is stable. How to inspect qualified seamless steel pipes A steel pipe with a seamless surface made of a single piece of metal is called a seamless steel pipe. Commonly used seamless steel pipes are ASTM A106 seamless steel pipe, ASTM A53 seamless steel pipe, ... Continue reading →

by leah li on Mar 6, 2023



The conventional process of precision seamless pipe is furnace+ESR->forging or forging. Product shape round bar, square flat bar and forgings. The steam turbine factory conducts deep processing, but the shape of the processing technology is relatively special, and the metal utilization rate after processing is about 30%. After being produced by extrusion, it will have the following advantages: 1. The precision seamless steel pipe is in the best stress state during the hot extrusion process, reducing internal defects of the product. 2. It is easy to realize a variety of cross-sectional shapes, suitable for multi-variety and small-batch production. 3. Uniform performance in all directions. The main production method of extrusion process: electric furnace + electroslag furnace -> forging or rolling blank -> induction heating -> extrusion -> annealing. The difference between extrusion and forging is: 1. The heating temperature of precision seamless extrusion is 30-60℃ ... Continue reading →

by leah li on Mar 2, 2023



Seamless pipe heat treatment defects 1. Definition: According to different uses, the metal material is heated to a suitable temperature and kept warm, and then cooled in different ways to change the metallographic structure of the metal material and obtain the required microstructural properties. This process is often referred to as heat treatment of metallic materials. The heat treatment of metal materials is divided into: ①Overall heat treatment ②Surface heat treatment ③Chemical heat treatment The heat treatment defects of steel pipes mainly include: unqualified structure and performance of seamless pipes, excessive size, surface cracks, scratches, severe oxidation, cooling, overheating or overburning, etc. 2. Steel pipe heat treatment and process characteristics: ①Heat treatment: one. Heating: Heating below Ac1 is mainly to stabilize the steel structure and eliminate internal stress. Heating above Ac3 is mainly to austenitize the steel. b. Insulation: The purpose is to make the ... Continue reading →

by leah li on Mar 1, 2023



Due to the inherent physical properties of stainless steel seamless pipe, such as low thermal conductivity, linear expansion coefficient, and strength under different temperature differences, etc., and the heat treatment of stainless steel welded pipes requires high temperature, rapid heating and rapid cooling, these factors lead to large-diameter thin-walled stainless steel welded pipes in the heat treatment process It is very easy to deform, if the heat treatment method is not appropriate, not only will the performance of the product not be improved, but will make its performance worse, which will greatly affect the on-site construction and the service life of the pipeline. The heating methods of post-weld heat treatment of stainless steel welded pipe mainly include gas heating, resistance heating and induction heating.   1 Physical properties of stainless steel   The main parameters for evaluating the cold and hot processing characteristics of stainless steel are linear ... Continue reading →

by leah li on Feb 28, 2023



Seamless carbon steel pipes are made of steel ingots or solid billets that are perforated into capillaries, and then hot-rolled, cold-rolled or cold-drawn. Hot rolled carbon seamless steel pipes are divided into ordinary steel pipes, low and medium pressure boiler steel pipes, high pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, geological steel pipes and other steel pipes. In addition to general steel pipes, low and medium pressure boiler steel pipes, high pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes and other steel pipes, cold-rolled (drawn) carbon steel seamless pipes also include carbon thin-walled steel pipes, alloy thin-walled steel pipes, Stainless steel thin-walled steel pipes, special-shaped steel pipes. The outer diameter of the hot-rolled seamless pipe is generally greater than 32mm, and the wall thickness is 2.5-75mm. The outer diameter of cold-rolled seamless pipe can reach ... Continue reading →

by leah li on Feb 27, 2023



The main defects of welded seam appearance of welded pipe Submerged arc welding is a welding method in which an arc burns under a layer of flux. Submerged arc welded pipe mainly includes straight seam submerged arc welded pipe (LSAW) and spiral submerged arc welded pipe (SSAW). 1. Undercut The reason why unilateral undercut defects are prone to appear during the welding process of welded pipes is that the gap between the forming seams changes too much, there are small burrs or small gaps on the edge of the strip, and the forming is improper. Incorrect. In this case, no major adjustments are required, and the strip edges can be machined as smooth as possible, maintaining a stable form as conditions permit. For the smooth treatment of the edge of the strip, the edge milling machine can be used instead of the disc trimming to solve the problem. During the welding process of the submerged arc welded pipe, a single undercut will also appear on both sides. The main reasons for this ... Continue reading →

by leah li on Feb 16, 2023



Anti-corrosion carbon steel pipes refer to steel pipes treated with anti-corrosion technology, which can effectively prevent or slow down the corrosion phenomenon caused by chemical or electrochemical reactions during transportation and use. Generally, it refers to the anti-corrosion treatment of ordinary steel pipes (such as seamless pipes and welded pipes) through special processes, so that the steel pipes have a certain anti-corrosion ability. Generally, it also has the characteristics of waterproof, anti-rust, acid and alkali resistance, and anti-oxidation. Generally speaking, PE anti-corrosion steel pipe refers to polyethylene anti-corrosion steel pipe, which is a tubular product processed by advanced science and technology. PE anti-corrosion steel pipes are widely used in oil, natural gas, city gas, urban water supply, coal water slurry pipelines, etc. Corresponding anti-corrosion measures can also be carried out on the inner and outer walls of the steel pipe according to ... Continue reading →


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