leah li

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

by leah li on Jan 24, 2024

Business

19 Views

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

Business

20 Views

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

Business

21 Views

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

Business

37 Views

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

Business

27 Views

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

Business

23 Views

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

Business

33 Views

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

Business

28 Views

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

Business

28 Views

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

Business

28 Views

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 →

by leah li on Nov 29, 2023

Business

29 Views

Common terms of seamless steel pipe (1) Nominal size and actual size: ①Nominal size is the nominal size specified in the standard, is the ideal size desired by users and production enterprises, and is also the order size indicated in the contract. ②Actual size: the actual size obtained in the production process, which is often greater than or less than the nominal size. This phenomenon of being larger or smaller than the nominal size is called deviation.   (2) Deviation and tolerance ①Deviation: in the production process, because the actual size is difficult to meet the nominal size requirements, that is, often greater than or less than the nominal size, so the standard stipulates that there is a difference between the actual size and the nominal size. A positive difference is called a positive deviation, and a negative difference is called a negative deviation. ②Tolerance: the sum of the absolute values of positive and negative deviations specified in the standard is used for ... Continue reading →

by leah li on Nov 28, 2023

Business

33 Views

What is a stainless steel welded pipe weld leveler? The weld seam leveling machine performs online processing on the welds of stainless steel welded pipes, and synchronously and repeatedly rolls the internal and external welds of the welded pipes to make the welds and the base metal smoothly transition and make the welds welded firmly. Seamless pipes highlight the advantages of welded pipes. Stainless steel welded pipe manufacturers have been troubled by the removal of internal and external weld reinforcement ribs, especially the removal of internal weld reinforcement ribs. Although there are solutions such as built-in scrapers or internal grinding devices, the results are not ideal. This seriously hinders the further expansion of the application fields of stainless steel welded pipes. 1. Equipment composition of stainless steel welded pipe weld leveling machine The internal leveling stainless steel mechanical equipment consists of an internal and external weld leveling frame, a ... Continue reading →

by leah li on Nov 23, 2023

Business

31 Views

What can steel sheet piles be used for? Unlike seamless pipes and ERW pipes, steel sheet piles are a steel structure with connecting rods on the edges. The connecting rods can be freely combined to form a continuous, dense retaining wall or water retaining wall. Application characteristics of steel sheet piles: 1. Handle and solve a series of problems that arise during the excavation process; 2. Simple construction and shortened construction period; 3. For construction tasks, space requirements can be reduced; 4. The use of steel sheet piles can provide necessary safety and timeliness (for disaster relief); 5. The use of steel sheet piles is not restricted by weather conditions; steel sheet piles can simplify the inspection of materials or systems during use. 6. The complex performance solution ensures its strong adaptability, good interchangeability and reusability. 7. Can be recycled and reused, saving money. Application of sheet piles in water conservancy projects (ports) and ... Continue reading →

by leah li on Nov 22, 2023

Business

32 Views

What should we pay attention to when installing and hoisting spiral steel pipes? The following points should be noted when hoisting spiral steel pipes (SSAW  steel pipes) 1. The horizontal contact surface between the hook and the end of the spiral steel pipe shall not be less than 40mm, otherwise the pipe mouth will be easily deformed and the pipe connection will be affected. 2. There is a limit on the number of hoisting steel wires. A maximum of 4-5 wires can be hoisted at a time for diameters 219, 273, 325, and 377, and a maximum of 2-3 wires can be hoisted at a time for diameters 426, 478, and 529. It can lift up to 2 steel pipes with diameters of 630 and 720 at a time, and can lift 1 steel pipe with diameters of more than 820 at a time. 3. A comprehensive inspection of light and heavy equipment such as cranes and spreaders should be carried out before hoisting. The crane should be in good condition. All lifting equipment, ropes, pulleys, shackles, rope clamps and other ... Continue reading →

by leah li on Nov 22, 2023

Business

52 Views

How to clean up defects in seamless steel pipe blanks? Overview 1. Steel billet types: continuous cast round billet, rolled (forged) round billet, centrifugally cast hollow round billet, steel ingot 2. Continuous casting types: vertical continuous casting machine, arc continuous casting machine, horizontal continuous casting machine 3. Advantages of slab continuous casting: ① Simple process flow and low production cost. ②High output. ③ Improved production conditions and high degree of automation. ④ Save energy. Continuous cast round billets are directly used to produce seamless pipes. Due to its low cost and good quality, it has brought a profound revolution to the seamless steel pipe manufacturing industry. At present, it has gradually replaced steel ingots and rolled (forged) round tube blanks to produce seamless steel pipes. In order to improve the quality of seamless steel pipes, we must first ensure the quality of steel billets. Inspection and cleaning of billet defects The ... Continue reading →

by leah li on Nov 15, 2023

Business

29 Views

What are the characteristics of steel pipe laser cutting? Cutting or separating steel pipes (welded pipes or seamless pipes) is an important part of forming. Commonly used methods include mechanical cutting, stamping and laser cutting. Laser cutting uses a focused, high-power-density laser beam to irradiate pipes, causing the irradiated material to quickly melt, vaporize, ablate or reach the ignition point. At the same time, the molten material is blown away by the high-speed airflow coaxial with the beam, thereby achieving the cutting of the steel pipe. Laser cutting is one of the thermal cutting methods. Stainless steel pipes below 4mm can be cut with laser cutting equipment, and carbon steel pipes with a thickness of 20mm can be cut by adding oxygen to the laser beam, but a thin oxide film will form on the cutting surface after cutting with oxygen. The maximum cutting thickness can be increased to 20mm, but the size error of the cutting parts is large. Features of laser cutting ⑴ ... Continue reading →

by leah li on Nov 14, 2023

Business

29 Views

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 surface ... Continue reading →

by leah li on Nov 13, 2023

Business

42 Views

Scope of application   Submerged arc welding is one of the most efficient mechanized welding methods today. Its full name is submerged arc automatic welding, also known as automatic arc welding under flux layer. It is a welding method in which the arc burns under the flux layer. Its inherent advantages such as stable welding quality, high welding productivity, no arc light, and low smoke make it the main welding method in the manufacturing of important steel structures such as pressure vessels, pipe manufacturing, and box beams and columns.   Argon arc welding technology is based on the principle of ordinary arc welding, using argon gas to protect metal welding materials, and using large current to melt the welding materials into a liquid state to form a molten pool on the base metal to be welded. Welding technology that realizes the metallurgical combination of the metal to be welded and the welding material. Since argon gas is continuously supplied during high-temperature ... Continue reading →

by leah li on Nov 9, 2023

Business

25 Views

Mechanical properties of different welded pipes The production process of straight seam welded pipes is relatively simple. The main production processes are electric resistance welded straight seam steel pipe (ERW pipe) and submerged arc welded straight seam steel pipe (LSAW pipe). Straight seam pipes have high production efficiency, low cost and rapid development. The strength of galvanized spiral welded pipes is generally higher than that of straight seam welded pipes, and the main production process is submerged arc welding. Spiral steel pipe (SSAW pipe) can produce welded pipes of different diameters from billets of the same width, and can also use narrower billets to produce larger diameter welded pipes. However, compared with straight seam pipes of the same length, the weld length is increased by 30~100% and the production speed is lower. Therefore, smaller diameter welded pipes mostly use straight seam welding, and large diameter welded pipes mostly use spiral welding. Welding ... Continue reading →

by leah li on Nov 8, 2023

Business

33 Views

Solutions to heat treatment deformation of seamless pipes Seamless steel pipe heat treatment refers to a seamless steel pipe thermal processing process that changes the chemical composition and structure of the surface or interior of seamless steel pipes through heating, insulation, cooling and other means to obtain the required performance. The reasons for the deformation of seamless steel pipes are often complicated, but they can be reduced and controlled as long as the deformation rules are mastered, the causes are analyzed, and different methods are used to prevent the deformation of seamless steel pipes. Generally speaking, the following methods can be used to prevent heat treatment deformation of seamless steel pipes. (1) Reasonable selection of materials. For seamless steel pipes, micro-deformation mold steel (such as air-hardened steel) with good material should be used. Mold steel with severe carbide segregation should be reasonably forged and tempered. For larger, ... Continue reading →

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