leah li

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

by leah li on Jun 12, 2024



Difference between oilfield drill pipe and drill collar   Definition of oilfield drill pipe and drill collar Oilfield drill pipe is a tool used in drilling operations. It is usually composed of multiple sections of drill pipe and is used for drilling and coring in oil wells. Drill collar is a tool used to remove impurities such as drill cuttings and gravel in drilling.   Difference between oilfield drill pipe and drill collar 1. Different functions Oilfield drill pipe is mainly used for drilling operations and coring, while drill collar is used to clean impurities in drilling and keep the wellbore clean. 2. Different structures Oilfield drill pipe is generally composed of multiple sections of steel pipe, and a drill bit is installed under the steel pipe to drill into the rock formation to obtain drill cuttings and samples. Drill collar is mainly composed of an integral structure, which has a certain elasticity and can remove impurities such as drill cuttings and gravel. 3. ... Continue reading →

by leah li on Apr 29, 2024



How to conduct quality inspection on stainless steel seamless pipe   Stainless steel seamless pipes are important pipe materials commonly used in industrial production. In order to ensure their quality and safety performance, strict quality inspection is required. The following are some commonly used quality inspection methods for stainless steel seamless pipe:   Quality inspection methods for stainless steel seamless pipe   1. Appearance inspection Appearance inspection is one of the simplest and most intuitive inspection methods. The inspector needs to carefully observe whether there are obvious defects, deformations, cracks and other problems on the surface of the pipe, and whether the size and shape meet the design requirements.   2. Pressure test Pressure test is an important method to detect the pressure bearing capacity of the pipeline. By applying a certain pressure to the pipeline, observe whether the pipeline has leakage, deformation and other ... Continue reading →

by leah li on Apr 23, 2024



Connecting methods of stainless steel seamless pipe Compression connection:This connection method uses special tools to clamp the stainless steel pipe in the pipe fitting to form a hexagonal cross-section, and cooperates with O-rings. It has the characteristics of leak-proof, stretch-proof, vibration-proof and high-pressure. Welding connection:The pipes are connected together by hot-melt technology. This connection method has high strength, but may affect the rust-proof performance of the weld. Self-locking connection:It was used for small-diameter plastic hose connection in the early days. The operation is simple but the sealing is poor. Ring pressure connection:A wide band sealing ring is set on the socket, and a special pressure ring tool is used to press the socket to form a ring-shaped compression seal. Socket connection:Including mechanical interfaces and non-mechanical interfaces. Nut connection:Also known as threaded connection, the pipe is connected to the pipe fitting ... Continue reading →

by leah li on Apr 16, 2024



Seamless pipe annealing process One of the most important process parameters for annealing seamless steel pipes is the maximum heating temperature (annealing temperature). The selection of annealing heating temperature for most alloys is based on the phase diagram of the alloy system. For example, the iron-carbon balance diagram for carbon steel is Base. The annealing temperatures of various steels (including carbon steel and alloy steel) vary depending on the specific annealing purpose. The annealing temperature of various non-ferrous alloys is a temperature below the solidus temperature of the alloy and above or below the solid solubility line temperature.   General principles of annealing When the steel pipe is heated, recovery and recrystallization processes will occur. The driving force is the cold deformation energy storage, that is, the free energy increase after cold deformation. When heated, the metal's organizational structure will transform to an equilibrium state. ... Continue reading →

by leah li on Apr 11, 2024



1. The composition of high-quality seamless steel pipe is uniform, the tonnage of the cold shear machine is high, and the cut end face is smooth and neat. However, due to poor material quality, the cut end face of fake and inferior materials often has flesh loss, that is, it is uneven and has no metallic luster. And because products produced from fake and inferior materials have fewer heads, big ears will appear at the head and tail. 2. Fake and shoddy seamless steel pipes have no metallic luster and are light red or similar in color to pig iron. There are two reasons why the blank is made of adobe. The rolling temperature of the shoddy and shoddy materials is not standard. The steel temperature is measured visually, so it cannot be determined as specified. When rolling is performed in the austenite region, the performance of thick-walled seamless steel pipes will naturally fail to meet the standards. 3. The material of fake and inferior seamless steel pipe contains many impurities, ... Continue reading →

by leah li on Apr 7, 2024



Application of seamless steel pipe in the construction pipeline industry Among the many pipe materials, the most practical one is seamless steel pipe. This is a pipe material with relatively powerful functions, not only because of its wide range of use fields and scope, but more importantly, Because the quality of seamless steel pipe is very good, the quality of seamless steel pipe is the reason why this pipe material has been promoted and developed in the industrial field. The quality of seamless steel pipe is very good. This is the complex production process of seamless steel pipe. Determined, the biggest feature of seamless steel pipe is that there are no seams in the pipe wall, while ordinary pipes have obvious seams. It is because of this small feature of seamless steel pipe that this type of pipe material Can be used and promoted in the industrial field. Seamless steel pipes are mainly used in pipeline transportation. They can be used to transport some fluids, such as some ... Continue reading →

by leah li on Apr 1, 2024



Heat treatment is a very important part of the steel pipe manufacturing process. Through heat treatment, the mechanical properties, chemical composition and microstructure of the steel pipe can be changed, so that it has better performance. During the heat treatment of mild steel tubes, parameters such as the heating speed, heating temperature and holding time of the steel pipe have an important impact on the performance of the steel pipe. In order to obtain the best performance of steel pipes, a reasonable heat treatment process needs to be developed. When manufacturing mild steel tubes, high-temperature quenching and tempering heat treatments are usually required. Quenching is to heat the steel pipe to a certain temperature and hold it for a certain period of time to fully austenitize it, and then cool it rapidly to transform the austenite into a martensite structure. Tempering is to heat the steel pipe to a certain temperature and keep it warm for a certain period of time, so that ... Continue reading →

by leah li on Mar 28, 2024



Carbon steel seamless pipes for ships (GB/T5312-85) are carbon steel seamless pipes used to create Class I pressure-resistant piping systems, Class II pressure-resistant piping systems, boilers and superheaters for ships. The working temperature of the wall of carbon steel seamless pipes does not exceed 450°C, and the working temperature of the wall of alloy steel seamless pipes exceeds 450°C. Carbon steel seamless pipe for ships refers to a seamless pipe material used in ship construction and maintenance. Its main feature is that it is made of carbon steel, which has high strength and corrosion resistance. GB5312-85 is a standard promulgated by the China Standardization Organization, which stipulates the technical requirements and test methods for carbon steel seamless pipes for ships. The technical requirements for carbon steel seamless pipes for ships mainly include the following aspects: 1 Material requirements: The material requirements for carbon steel seamless pipes are ... Continue reading →

Characteristics of seamless steel pipes

by leah li on Mar 25, 2024



Seamless steel pipe is a round, square or special-shaped tubular structure with a hollow cross-section and no seams around it. It is widely used in various machinery manufacturing fields. This article will focus on the characteristics of seamless steel pipes. Seamless steel pipes are made of high-quality steel and precision processed through multiple processes. They have the following characteristics: 1. High precision: Seamless steel pipes have high dimensional accuracy and can meet high-precision mechanical manufacturing requirements. 2. High strength: Due to the structural characteristics of seamless steel pipes, their tensile strength and compressive strength are both high, and they can withstand large pressure and tensile forces. 3. Corrosion resistance: The surface of seamless steel pipe is smooth, difficult to adhere to dirt and impurities, and has strong corrosion resistance. 4. Light weight: The wall thickness of seamless steel pipes is thinner. Compared with seamed pipes, ... Continue reading →

The density of seamless carbon steel pipe and its importance

by leah li on Mar 20, 2024



Seamless carbon steel pipe is a commonly used steel product that is widely used in many industries. Understanding the density of seamless carbon steel pipe is critical to the correct selection and use of steel pipe. What is the density of seamless carbon steel pipe? Density is the ratio of a substance's mass to its volume, usually expressed in grams per cubic centimeter (g/cm³). In the steel industry, the density of seamless carbon steel pipes refers to the mass of steel contained in unit volume. The density of steel pipes of different materials will vary, which is determined by their chemical composition and physical structure. The importance of density of seamless carbon steel pipes 1. Material selection: Understanding the density of seamless carbon steel pipes can help us choose the steel pipe material suitable for a specific application. Density is directly related to the weight of the steel pipe, and weight is closely related to factors such as transportation cost and ... Continue reading →

by leah li on Jan 24, 2024



Quenching and bending of seamless pipes Seamless pipes are an important type of steel pipe in production and life, and are an important durable steel material among steel pipes. Seamless steel pipes will also encounter bending deformation during use. When the seamless steel pipe is bent and deformed, the seamless steel pipe can continue to be used as long as it can be corrected, otherwise the seamless steel pipe will affect its use. The curvature of seamless steel pipes can also be controlled and should be controlled from the following aspects: The degree of bending of seamless steel pipes during quenching can be controlled from the following aspects: (1) Adopt a graded cooling process of outer spraying first and then inner spraying. Because the water spray inside the seamless steel pipe flows from one end of the seamless steel pipe to the other end, the cooling rates of the two ends of the seamless steel pipe are different, causing the seamless steel pipe to bend. Therefore, the ... Continue reading →

by leah li on Jan 24, 2024



What are the characteristics of fluid steel pipes? Fluid pipelines are pipelines (mostly seamless pipes) specially used to transport media with fluid properties. Media with fluid properties, in addition to liquid media such as water, oil, and solutions, solid media such as cement, grain, and coal powder can also flow under certain conditions. Fluid pipes can be made from non-ferrous metals such as steel, copper, titanium, or even non-metallic materials such as plastic. Types of fluid steel pipes The fluid tube must have a hollow section, but can also be square, triangular or any other shape. Some equipment is restricted by conditions and must use rectangular tubes, but most still use round tubes. Circular tubes have the smallest circumference/area ratio of all geometric cross-sections, meaning that the largest internal cross-section can be obtained using the same amount of material. However, round tubes also have certain limitations. For example, under plane bending conditions, the ... Continue reading →

by leah li on Jan 17, 2024



Why do seamless steel pipes fold outward? External folding is a common external surface defect of seamless steel pipes, which is characterized by spiral layered folds on the outer surface of the steel pipe. The outward folding of seamless steel pipes is mostly caused by defects in the steel billet. During the rolling process of steel pipes, because the steel billet is often subjected to alternating tensile stress, the stress state is relatively bad, and it is easy to expand the defects of the steel billet. The corresponding inner surface defect is the inward folding of the seamless steel pipe, which is characterized by linear or spiral or semi-helical jagged defects on the inner surface of the steel pipe. Seamless steel pipe external folding is divided into steel external folding and operating external folding 1.Steel folding There are two main types of external wrinkles in steel: the first is irregular sheet-like wrinkles on the outer surface of the steel pipe. The outer edges of the ... Continue reading →

by leah li on Jan 10, 2024



Stainless steel seamless pipe surface treatment method Stainless steel seamless pipe is a kind of hollow long round steel, which is mainly widely used in industrial pipelines and mechanical structural components such as petroleum, chemical industry, medical treatment, food, light industry, mechanical instrumentation and so on. In addition, when the bending and torsional strength are the same, the weight is lighter, so it is also widely used in the manufacture of mechanical parts and engineering structures. It is also commonly used as furniture and kitchen utensils. Commonly used surface treatment technologies for stainless steel pipes include the following treatment methods: ① surface whitening treatment; ② surface mirror brightening treatment; ③ surface coloring treatment. 1. Natural color whitening treatment on the surface of stainless steel pipe: During the processing of stainless steel pipes, black oxide scale will be produced after coiling, edge sealing, welding or artificial ... Continue reading →

by leah li on Dec 22, 2023



What is high frequency quenching of steel pipes? High-frequency quenching is mostly used for surface quenching of steel pipes (seamless pipes and welded pipes). It is a metal heat treatment method that generates a certain induced current on the surface of the steel pipe, rapidly heats the surface of the steel pipe, and then quickly quenches it. Induction heating equipment, that is, equipment for induction heating and surface quenching of steel pipes. Induction heating principle: The steel pipe is placed in an inductor, which is generally a hollow copper pipe, and medium-frequency or high-frequency alternating current (1000-300000Hz or higher) is input. The alternating magnetic field generates induced currents of the same frequency in the steel pipe. The distribution of this induced current in the steel pipe is uneven. Strong on the surface, weak on the inside, and close to zero in the center. Utilizing this skin effect, the surface of the steel pipe can be rapidly heated, and the ... Continue reading →

by leah li on Dec 20, 2023



How to prevent seamless pipe welding spatter?   Spatter is metal flying out of the molten pool during seamless pipe welding. Splashes can easily scratch seamless pipes, contaminate the protective glasses of welding helmets, contaminate the filters and frosted glass of equipment cameras, etc. Effects of welding spatter on seamless pipes: 1. Reduce welding deposition efficiency and reduce welding productivity; 2. Spatter easily adheres to the weldment and nozzle, affecting the welding quality, worsening the welding working conditions and increasing the cleaning time; 3. The welding molten pool is unstable, resulting in defects such as rough weld shape. Splash protection measures 1. During arc welding of seamless pipes, there is a certain pattern between the spatter rate of each wire diameter and the welding current. The spatter rate in the low current area is small, the spatter rate in the high current area is also small, and the spatter rate in the middle area is large. Therefore, ... Continue reading →

by leah li on Dec 13, 2023



What are the structures of oil pipelines? Oil pipes are seamless pipes suitable for furnace tubes, heat exchangers and pipes in petroleum refineries. Oil pipe is a long steel material with a hollow cross-section and no seams around it. Oil cracking pipe is a kind of economical cross-section steel material. It is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes, automobile drive shafts, bicycle frames, steel scaffolding used in construction mobile screens, etc. Using petroleum cracking pipes to manufacture ring-shaped parts can improve material utilization, simplify the manufacturing process, and save materials and processing hours, such as rolling bearing rings, jack sets, etc. Steel pipes have been widely used. Petroleum cracked tubes are also an indispensable material for various conventional weapons. Barrels, barrels, etc. must be made of petroleum cracked tubes. Petroleum cracking pipes can be divided into round pipes and ... Continue reading →

by leah li on Dec 12, 2023



How are stainless steel welded pipes processed? welding: Before processing and welding stainless steel welded pipes, rust, oil, water, paint, etc. that are harmful to welding should be thoroughly removed, and welding rods suitable for the steel type should be selected. The processing time of stainless steel welded pipe is shorter than that of carbon steel spot welding, and a stainless steel welded pipe brush should be used to remove welding slag. After welding, the surface should be polished or cleaned to prevent local corrosion or strength reduction. Stainless steel welded pipe cutting and stamping: Because stainless steel welded pipe is stronger than ordinary materials, higher pressure is required when stamping and shearing. Only when the gap between the knives is accurate will there be no shear failure and work hardening. Cut using plasma or laser. When gas cutting or arc cutting must be used, the heat affected zone should be ground and heat treated as necessary. Processing and ... Continue reading →

by leah li on Dec 6, 2023



How to identify the quality of seamless pipe? The application of seamless steel pipe is more and more extensive. When we choose seamless steel pipes, we must check the quality of seamless steel pipes. Let me give you a detailed introduction: 1. Fake and inferior seamless steel pipes are easy to scratch, because the fake and inferior seamless steel pipe manufacturers have simple equipment, which is prone to burrs and scratches on the steel surface. Deep scratches reduce the strength of the steel. 2. The counterfeit seamless carbon steel pipe has no metallic luster and is light red or similar to pig iron. 3. The cross ratio of counterfeit seamless steel pipes is thin and low, and the filling is often not full. The reason is that the manufacturer needs to achieve a large negative tolerance, the reduction in the first few passes of the finished product is too large, the iron shape is small, and the pass shape is not satisfactory. 4. Counterfeiters must reduce the number of the first two ... Continue reading →

by leah li on Dec 5, 2023



Inspection items for seamless carbon steel pipes The inspection of seamless carbon steel pipes generally includes: inspection of geometric dimensions and surface quality; inspection of chemical composition, mechanical properties, process properties, high and low microstructures; non-destructive testing; some special performance inspections and length measurements. (1) Geometric inspection of seamless steel pipes: The outer diameter, wall thickness, bending degree and length of seamless steel pipes can be inspected on the inspection table with external calipers, micrometers, bending gauges and length tapes. For the outer diameter, wall thickness and length, automatic size detection devices (such as automatic diameter measuring, thickness measuring, and length measuring devices) can also be used for continuous detection. The seamless steel pipe production plants put into operation in the late 1980s generally have online automatic diameter and thickness measuring devices, and length ... Continue reading →



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