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2023 / 04 / 17
In recent news, a petroleum pipeline has been the center of attention due to concerns over safety and environmental impact. The pipeline in question, which stretches over hundreds of miles, is used to transport petroleum products such as gasoline, diesel, and jet fuel. The pipeline is owned and operated by a major oil company and is an essential part of the nation's energy infrastructure. However, recent events have brought the safety of the pipeline into question. In one incident, a section of the pipeline ruptured, causing a significant spill of petroleum products into nearby waterways. This spill has had a severe impact on the environment and wildlife in the area. The company has responded to these concerns by stating that they are taking all necessary measures to ensure the safety of the pipeline. This includes regular inspections and maintenance, as well as investments in new technologies to detect potential issues before they can cause significant harm. Despit
Introduction of continuous quenching characteristics of 20G seamless steel pipe
2023 / 04 / 06
20G seamless tube continuous quenching is to better ensure the characteristics of the plate, pickling passivation is to ensure the surface quality. To a certain extent, it can ensure the use of 20G seamless steel pipe throughout the later stage. In the continuous quenching of 20G seamless pipe and its pickling process, the pickling passivation section is the key component of the generator set. The acid management method is the key way to ensure the normal and smooth operation of the pickling passivation section, which is particularly important for the process performance of hot rolled strip and the effective use of acid. The basic core concept of acid management is to maintain the stability of the ion concentration of metal materials in the acid solution, so as to ensure the best and stable practical effect of pickling passivation.In specific production, for the mixed acid pickling passivation section, the mixed acid tank generally located in the middle and downstream of the production line will specify a lower ion concentration of the metal material to ensure the actual effect of the final pickling passivation. It has the ability to resist air and air oxidation, and also has the ability to corrode in substances containing acids, alkalis and salts, that is, corrosion resistance. However, the size of its corrosion resistance work capacity varies with the organic chemical composition of its steel, interactions, application standards and the type of natural environmental substances.In order to achieve this overall goal, first of all, according to the steel grade of hot-rolled strip, the amount of pickling passivation section per unit area, clarify the zinc ash composition of the surface layer of hot-rolled strip and the concentration value of the required acid, the acid intelligent management system will automatically carry out relevant measurements, clarify the amount of new acid added and waste acid consumption, and carry out relevant practical operations according t
Introduction of hot stamping forming process for seamless steel pipe
2023 / 04 / 06
The purpose of this process is to heat the seamless steel pipe to a suitable temperature, so that the wear-resistant pipe is completely martensite and has excellent plastic deformation. The mechanical equipment used for heating is a dedicated continuous heat treatment furnace. After heating above the work hardening temperature, the surface layer is easily oxidized in the air to form oxide scale, which causes adverse damage to subsequent production and processing. In order to better prevent or reduce the air oxidation of wear-resistant pipes in the heat treatment furnace, a rare gas protection system is generally set in the heat treatment furnace, or the surface oxidation treatment of the pipe refers to the removal of the heated seamless steel pipe from the heat treatment furnace and put into the thermoforming mold. In this process, it is necessary to ensure that the wear-resistant tube is migrated to the mold as soon as possible. On the one hand, it is to better avoid air oxidation of seamless steel pipe at high temperature, and on the other hand, it is to better ensure wear resistance. The pipe is still at a high temperature when it is formed, and it has excellent plastic deformation. Stamping die and heat treatment: After the wear-resistant pipe is put into the mold, the stamping die should be formed on the seamless steel pipe immediately to avoid excessive temperature drop affecting the forming characteristics of the wear-resistant pipe. After molding, the mold shell should be closed and maintained at a pressure for a period of time. On the one hand, it is to better control the appearance of the part. The body of the body, producing excellent specification accuracy and physical properties. Studies have shown that at this stage, the minimum cooling rate of ordinary hot stamping mold stainless steel sheet to complete the transformation of martensite to austenite is 27~30 °C/s, so it is necessary to ensure that the cooling rate of the mold shell to the pipe exceeds
Introduction of different production and processing technologies for 20G seamless pipes
2023 / 04 / 06
Cold extrusion method. This production and processing method is more purposeful. Before the slab production and processing is ready for extrusion, when extruding into a pipe with a diameter of 100mm, the investment in machinery and equipment is small, the consumption of raw materials is small, and the technology is relatively perfect. Once the tube size is increased, the cold extrusion method must have a large cargo capacity and high-power mechanical equipment, so the automatic control system will be upgraded. The planned product workpiece or preform void is fixed on the rotating journal, pulley working pressure void, radial wheel. After one or several solutions, the whole process can have a variety of hollow thick-walled rotating body products. The products produced by high-precision production and processing methods have excellent physical properties, a wide variety of specifications, mold shells and special tools are very simple, easy to replace, and the product cost is relatively low.The time is not long enough, the production volume is not high, the length of the production and processing line is relatively limited, and the scale of machinery and equipment is generally short. The way heat pushes the aperture. This method is more flexible in application, simple mechanical equipment specifications, low cost, convenient maintenance, economical and durable development, and flexible product specifications. For example, large-diameter production must have grooved pipe elbows and other similar products, only need to add some spare parts. The heat push and expansion pipe method is suitable for the production of large-diameter, thick-walled, thin-walled, 20G seamless pipes, and can also make the working capacity of thick-walled pipes and pipes not exceed machinery and equipment. Hot perforation and cold rolling.This method is based on expanding, expanding, vertical flipping, and tilting rolling. The former mainly includes limited mandrel cold rolling, few-station mandre
What are the advantages of 20G seamless pipe production?
2023 / 04 / 06
Stepper heat treatment furnace is the furnace type used for 20G seamless tube heat treatment production line. It has the following advantages: high output, output can reach more than 50t. Stepper motor furnace is a type of furnace that can be produced continuously. The automation technology is complete, and the range of 20G seamless tubes that can be solved is also wide; The heating stepper motor furnace adopts gas or solid fuel, the heat conduction mode of 20G seamless tube is radiation source and heat convection, and the 20G seamless tube is in the furnace. The internal "empty frame" is evenly distributed on the fabric beam (fixed beam). The temperature uniformity can reach l5Y when the 20G seamless tube is released, because the 20G seamless tube is in the furnace. The main beam is heated in the "empty frame" state, and the 20G seamless tube can rotate a certain viewing angle with each step forward; Small deformation because the 20G seamless tube is ideal in the furnace heating method and the temperature is uniform, so the 20G seamless tube has no effect. When the seam pipe was announced, the bending and ovality were small, creating a standard for refrigeration processes such as medium fire; Automation technology that facilitates the actual operation of manufacturing, the heating state of the 20G seamless tube in the furnace and the operating status of the natural gas burner are easy to observe, setting the standard for instant adjustment.
How to improve the service life of Q345B seamless pipe?
2023 / 04 / 06
Reduce friction. In the cold drawing process, effective lubrication can reduce the friction coefficient of the contact surface between the cold drawing die and the deformed metal, reduce the energy consumption of surface friction, reduce the pulling force, and reduce the consumption of the pulling force. Reduced mold wear. Effective lubrication can reduce the wear of the mold during cold drawing, which can not only reduce the production cost, but also reduce the time to replace and repair the mold, improve productivity, and at the same time reduce the labor intensity and ensure the dimensional accuracy of the mold. Reduce the surface roughness of Q345B seamless pipe. Our Q345B seamless pipe required a smooth inner and outer surface. Poor lubrication during cold drawing will not only cause defects such as hairy hairs and bamboo nodes on the surface of the drawn product, but even cracks. Therefore, effective lubrication can guarantee Q345B seamless pipe. Reduce the surface temperature of cold-drawn products. When the metal pipe is plastically deformed in the die hole, in order to overcome the deformation tension and the friction of the mold wall, the external force requires a lot of energy, and also generates a lot of heat. Effective lubrication will greatly reduce the generation of heat, ensure the improvement of pipe quality and reduce energy consumption. Reduce uneven stress distribution in cold-drawn products. The quality of lubrication affects the distribution of stress within the product. A sudden change in stress in the cold-drawn deformation zone will lead to a serious decrease in the mechanical properties of cold-drawn products. In the case of uneven stress distribution, high local internal stress will lead to product rupture. Prevent rust of the product. In the cold drawing process, phosphating can also prevent corrosion, thereby improving the corrosion resistance of cold drawn products and extending the service life.
What are the factors that determine the performance of 20 #seamless pipe?
2023 / 04 / 06
20# seamless pipe is an austenitic stainless steel seamless engineering pipe. In addition to excellent tensile resistance, corrosion resistance, high toughness and other basic physical properties, it also has a high-quality appearance. That is to say, the gloss of the surface layer of the 20# seamless pipe should be within the standard aspect ratio, but it should be noted that the gloss of the 20# seamless pipe will be due to poor actual operation or insufficient preparation in the production process. One of the key factors that jeopardize the performance of the 20# seamless pipe process is the excessive oil content of the emulsified oil. It plays an important role, but emulsified oil contains oil, and the oil will crack into carbon at high temperatures. If the oil in the emulsified oil cannot be eliminated immediately after high-temperature carbonization, it will accumulate on the surface of the 20# seamless pipe, and embossing will appear after cold rolling. Use organic solvents and solvents to clean the surface of stainless steel plates to remove oil, vegetable grease, dust, polishes and similar organic compounds, but not enough to remove rust, scale, flux, etc. Corrosion generation is only used as a matching technique. Mainly use steel brushes and other items to polish the surface of stainless steel plate, which can remove loose or warped oxide scale, rust, welding penetration, etc. Generally, two methods of organic chemistry and electrolysis are used for pickling and passivation. For the anti-corrosion of steel pipes, only organic chemical pickling passivation is used, which can remove oxide scale, rust, and old coatings. Sometimes it can be used as shot blasting to remove rust. Post-processing. Although chemical water treatment can make the surface reach a certain degree of cleanliness and roughness, its anchor pattern is shallow, which is easy to cause environmental pollution to the environment. Due to the large oil content of 20# seamless pipe emulsified oil
What are the quality requirements of Q345B seamless pipe products?
2023 / 04 / 06
Since the inner and outer walls of Q345B seamless pipe have no oxide layer, it has the advantages of water tightness, high precision, high finish, cold drawing, flaring, flattening and no voids. Therefore, it is used to produce important products for pneumatic or hydraulic press parts. At present, the vast majority of Q345B seamless pipes use two different production processes: cold drawn and hot rolled. Relatively speaking, the production and processing process of large-diameter Q345B seamless pipe and cold-rolled pipe will be more complicated. High-precision cold-rolled pipe fittings should not only continue to be cold-rolled, but also carry out mold shell experiments, so as to better ensure the quality of high-precision pipe raw materials. Surface environmental pollution: The oil, dust, acid, alkali, salt, etc. attached to the surface of Q345B seamless pipe are converted into corrosive substances under certain standards, so that some components in Q345B seamless pipe undergo chemical changes, resulting in organic chemical corrosion and rust. Surface scratches: various scratches destroy the passivation film, reduce the maintenance ability of stainless steel plate, and easily react with organic chemicals, resulting in organic chemical corrosion and rust.After phosphating treatment, unclean cleaning will leave residual liquid, and immediately corrode Q345B seamless pipe. Environmental pollution of carbon steel: Scratches and corrosive substances generated by contact with Q345B seamless pipe produce electrochemical reactions, causing photocatalytic corrosion. Laser cutting: The adhesion of rusty chemicals such as cutting slag and splash and corrosive substances produces an electrochemical reaction, causing photocatalytic corrosion. The composition of the flame heating zone and the alloy composition change unevenly, and the electrochemical reaction with corrosive substances causes photocatalytic corrosion. The production of Q345B seamless pipe has strict regulations.
How to solve the uneven wall thickness of Q345B seamless pipe?
2023 / 04 / 06
Among them, there will be problems with uneven thickness. This issue is also normal. We should pay more attention to the whole process of production and processing. But how do we solve this problem? The key manifestations are uneven thickness of spiral walls, uneven thickness of parallel lines, and slightly thick thickness of head and tail. In the following aspects, how to solve the uneven thickness of Q345B seamless pipe manufacturers? Q345B seamless pipe manufacturers uneven wall thickness key elements. For example, the reasons for the uneven thickness of the spiral wall are: the cold rolling axis of the cutting machine is skewed, the inclination angle of the two hot-rolled strips is different, or the amount of pressure before the rolling mill is different. The upper edge is too small. The total length is spiral. Generally, the first type of wire break is terminated in the flow operation, and the seamless pipe is heat treated to control the subsequent seamless pipe breaking during the heat treatment process. Burn-through averages the temperature and makes the necessary changes to the structure, and then the average structure and characteristics are obtained. In general, the development of heating temperature can appropriately reduce the holding time. When terminating ultra-low temperature quenching, the closer the annealing process is to the low zero point, the faster the seamless tube responds and the cutting effect is more delicate Cold work hardening. Therefore, the holding time can also be appropriately shortened. Q345B seamless pipe manufacturers in the whole process of cold rolling, due to the premature opening of the safety roller, unreasonable adjustment of the safety roller, small chain chatter, etc., caused by uneven thickness, generally spread in a spiral shape along the rolling direction. The total length of the seamless steel pipe. The countermeasures that can be taken are: adjust the cold rolling axis of the cutting machine so that the inclination a
Q345B seamless pipe deep processing technology characteristics
2023 / 04 / 06
After emptying, the total surface area of the seamless pipe increases, while the inner surface area decreases, so there will be a neutralization layer between the inner and outer layers, and the area will increase in the outer layer, the middle layer and all the layers in the middle will increase the area, while the outer layer will be greatly increased. The inner surface layer and the middle layer, the inner surface layer is greatly reduced. The transformation characteristics of each layer area of the seamless pipe during air drawing affect the asymmetry of the deformation of the metal material. One of its characteristics is that the layers are unevenly widened along the wall thickness. Of course, the outer surface of the seamless tube is the smallest, while the inner surface of the seamless tube is the largest.The widening of the middle layer is determined by the outer layer. It gradually rises to the inner surface layer. The second feature is that due to the comprehensive relationship, the layers of Q345B seamless pipe cannot be widened differently when deformed, so the layers must be mutually restricted. Since the width of the surface metal material is smaller than the width of the inner metal material, the surface layer must be constrained by the inner layer when deformed, and its specific widening ratio is of course widened. Conversely, the widening of the inner layer is blocked by the surface layer, which is of course smaller than the widening rate, and the thickness increases. Q345B seamless tube needs to be heated and hardened. This type furnace is suitable for heat treatment of large and large volume steel pipes, with an output of more than 1.0 tons per hour. The protective gases that can be used are high-purity hydrogen, decomposition of ammonia and other protective gases. Can be equipped with convection cooling system to make steel pipes cool faster. Mesh belt type bright heat treatment furnace. This furnace is suitable for small-diameter thin-walled pr
What are the preventive measures for cold treatment of seamless pipes?
2023 / 04 / 06
If the wrong cold treatment method is chosen, it will affect the characteristics of the precision seamless tube. Therefore, precautions must be taken throughout the cold treatment, but most people do not know how to do it well. Well, in fact, the specific main content depends on the following aspects. The hydraulic system of precision seamless tube piston machine has two types: single piston rod cylinder and double piston rod cylinder. The single-piston rod hydraulic system has only one end of the hydraulic cylinder, and the two sides are the oil outlet and the oil return hole to achieve horizontal movement, also known as double-effect cylinder, which is very common in the construction of hydraulic excavators and other machinery. The double-piston rod hydraulic system of precision seamless pipe has hydraulic cylinders extending on both sides, and its composition is basically the same as that of single-piston hydraulic systems. When the right cavity of the hydraulic system is filled with liquid, and the left cavity is pumped oil, the piston rod is eccentric, and the opposite piston rod is eccentric. Since the diameter of the hydraulic cylinder on both sides of the precision seamless pipe is the same, the total effective area on both sides of the piston rod is the same. In addition, such hydraulic systems are often found in areas where the back and forth speed is the same but the driving force is not large, such as CNC grinding machine consoles. Before cold treatment, the precision seamless tube should be boiled in boiling water for 30 seconds, which can reduce the thermal stress by about 15%. Cold treatment can be carried out according to traditional methods. The recommendation is to choose the basic scheme of minus 60 degrees, and then carry out hydrogen production at minus 120 degrees. The lower the solution temperature, the higher the amount of residual martensite converted into austenite in the seamless tube, but it is unlikely, after the test can find that most
How to increase the anti-corrosion performance of seamless steel pipes?
2023 / 04 / 06
We all know that if the seamless steel pipe is placed outdoors for a long time, or there is some friction, the air oxide layer on the surface of the seamless steel pipe will be destroyed, and then it will be corroded by air oxidation. In humid and cold gas environments. Therefore, oil-immersed transformers should be placed in a sealed area as much as possible. Oil-immersed transformer, but seamless steel pipe, with resource advantages. Because its surface is not easily oxidized by air, the key is inseparable from the raw materials that make up seamless steel pipes. Precision stainless steel pipe relies on an ultra-thin, firm and smooth chromium-rich air oxide film produced on its surface to avoid the re-permeation and re-oxidation of oxygen atoms and obtain anti-rust working ability.Seamless steel pipe refers to the whole process of all pipeline connection, some different pipes or some spare parts connected together, naturally will be fixed on a pipeline branch pipe or flange, transformer manufacturers will also fix in several different branch pipes or flanges, and then add some metal gaskets or rubber gaskets in the whole connection process. In this case, a reasonable connection can be made. Of course, transformer manufacturers also have some pipelines that will have seamless steel pipes built into the equipment itself, so this kind of thing belongs to seamless steel pipe connections. In such cases, they are often considered the most critical interface method in the entire pipeline installation process. The description of seamless steel pipe is that the part of the transition film with weak corrosion resistance will cause pitting corrosion due to self-excitation. The creation of small pores removes adjacent sulfates into highly corrosive aqueous solutions, thereby accelerating the rate of corrosion. In addition, stress corrosion cracking inside the stainless steel plate will destroy the transition film on the surface of the stainless steel plate. Therefore, the sur
What are the applications of seamless pipes in industry
2023 / 04 / 06
With the development of science and technology in China, seamless pipe is a new type of transportation equipment that has developed rapidly with the development of scientific production technology in China. For this seamless pipe, industry experts said that this conveying pipe is the use of electromagnetic induction principle, according to the conductive medium through the external magnetic field, and then generate induced electromotive force, is a working principle of liquid transportation. For many enterprises using this kind of conveying equipment, how to ensure the normal operation of seamless pipes is an indispensable part of the daily production process, and it is also necessary to carry out daily maintenance of pipelines.What should be paid attention to when using seamless pipes in industrial production? For general enterprises, the seamless pipe once a year to do a more comprehensive inspection, not only from the appearance, but also to the key parts of the pipe to detect, and then calibrate a transportation value, and is must confirm the voltage and circuit of the original pipe to ensure that there is no error in each link, so as to ensure the accuracy of the pipeline transportation in daily production activities. Industry professionals often perform zero drift when inspecting such seamless tubes. Zeroing is very necessary. In-line zeroing must be a stop for the flow of the conveying liquid. This is actually not easy to do, so during the inspection, the operation of the sensor is often checked. Professionals also said that if the results obtained after testing the pipe are consistent with the historical test results, it means that there is no problem with the pipe and can continue to be used. In fact, for this very precise stainless steel pipe, in the daily work and production, there may be some transportation deviations in the transportation equipment due to some poor operation. Therefore, for enterprises, on the one hand, it is necessary to strengthen the
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