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Steel sheet support is mainly a structure that uses steel sheet piles as support structural materials to support and retain foundation pits. Steel sheet piles can be reused, which not only saves construction materials, but also is easy to operate, fast in construction, and can ensure the safety performance of the entire project. They are widely used in foundation pit support, embankment protection or retaining walls and other fields. Steel sheet piles are mainly divided into six types according to the cross-sectional type: U-shaped steel sheet piles, Z-shaped steel sheet piles, straight-edge steel sheet piles, H-shaped steel sheet piles, tubular steel sheet piles and AS-shaped steel sheet piles. During the construction process, steel sheet piles with different cross-sectional types need to be selected according to the engineering conditions and cost control characteristics. 1. U-shaped steel sheet piles Larsen steel sheet piles are a common type of steel sheet piles. Its ... Continue reading →

1. Surface treatment and anti-corrosion methods of angle steel Surface treatment and anti-corrosion of angle steel are key links to ensure its performance and extend its service life. Common surface treatment processes for angle steel include hot-dip galvanizing, cold-dip galvanizing, spray treatment, electrogalvanizing and mechanical galvanizing.   (1)Hot-dip galvanizing This is to immerse the angle steel after rust removal in a zinc solution melted at about 500℃, so that a zinc layer is attached to the surface of the angle steel, thereby achieving the purpose of anti-corrosion. Hot-dip galvanized angle steel is also called hot-dip galvanized angle steel. Its galvanized layer has a uniform thickness, which can reach 30-50um and has good reliability. The galvanized layer is metallurgically bonded to the steel and becomes part of the steel surface. Therefore, the coating durability of hot-dip galvanized angle steel is relatively reliable. This process is suitable for various ... Continue reading →

The method of using acid solution to remove scale and rust on the surface of steel is called pickling. Scale, rust and other iron oxides react chemically with acid solution to form salts that dissolve in acid solution and are removed. Acids used for pickling include sulfuric acid, hydrochloric acid, phosphoric acid, nitric acid and mixed acid.   Common media for pickling of seamless steel pipes and erw tube: sulfuric acid, nitric acid, phosphoric acid, hydrofluoric acid. Be sure to add pickling corrosion inhibitors during pickling to prevent acid corrosion of metals.   Pickling process of seamless steel pipes Mainly include immersion pickling method, spray pickling method and acid paste rust removal method. Generally, immersion pickling method is used, and spraying method can be used in mass production. Steel parts are generally pickled in 10% to 20% (volume) sulfuric acid solution at a temperature of 40°C. When the iron content in the solution exceeds 80g/L and ferrous ... Continue reading →

Uses and models of 304 stainless steel plate   304 stainless steel plate is an austenitic stainless steel containing 16% to % chromium and up to 35% nickel. It is the most common and widely used stainless steel variety with good corrosion resistance, heat resistance, low temperature strength and mechanical properties; good hot processing properties such as stamping and bending, and no heat treatment hardening phenomenon (use temperature -196℃～800℃).   The surface of 304 stainless steel plate is beautiful and has diverse possibilities for use. Its chemical composition is shown in the following table:   The physical properties of 304 stainless steel plate are shown in the following table   Due to its excellent performance, 304 stainless steel plate is widely used in the following fields: (1) Food field: suitable for food processing, storage and transportation, such as kitchen utensils, production equipment, tableware, cabinets, etc.   (2) Chemical field: ... Continue reading →

Galvanized steel sheet is a steel sheet coated with a certain thickness of zinc to improve corrosion resistance. Since the 1970s, car body steel sheets have begun to be galvanized. During assembly, in order to improve the corrosion resistance of the car body, the galvanized surface is placed inside the car, and the non-galvanized surface is placed outside the car for painting. As the corrosion resistance requirements of automobiles continue to increase, the weight of galvanized steel sheets continues to increase, and the galvanized layer also has double-layer galvanized steel sheets.   However, increasing the weight of galvanizing will also greatly increase the power consumption of galvanizing, resulting in increased material costs. Therefore, in the late 1970s, a galvanized steel sheet produced by hot-dip galvanizing process appeared, called hot-dip galvanized steel sheet. At present, galvanized steel sheets have been widely used in automobiles, with a thickness of 0.5-3.0 mm, ... Continue reading →

Heat treatment refers to a metal thermal processing process in which the material is in a solid state and obtained by heating, holding and cooling to obtain the expected structure and properties.   (1) Cold drawn seamless steel pipe annealing: refers to a heat treatment process in which metal materials are heated to an appropriate temperature, maintained for a certain period of time, and then slowly cooled. Common annealing processes include: recrystallization annealing, stress relief annealing, spheroidizing annealing, complete annealing, etc. The purpose of annealing: mainly to reduce the hardness of metal materials, improve plasticity, to facilitate cutting or pressure processing, reduce residual stress, improve the uniformity of the structure and composition, or prepare the structure for subsequent heat treatment, etc. (2) Normalizing cold-drawn steel pipes: refers to a heat treatment process in which steel or steel parts are heated to 30 to 50°C above Ac3 or Acm (the ... Continue reading →

In the API SPEC 5CT casing pipe standard, the steel grade of casing and tubing indicates its yield strength and characteristics. Steel grade markings are usually represented by 1 letter and 2 or 3 numbers, such as N80. In most cases, according to the order of letters in the alphabet, the later the letter, the greater the yield strength of the pipe. For example, N80 grade steel casing pipe has a greater yield strength than J55: the numerical notation is determined by the minimum yield strength of the pipe expressed in thousands of pounds per square inch. For example: the minimum yield strength of N80 steel grade is 80klb/in2   The oil and casing steel grades listed in the API SPEC 5CT standard are: H40, J55, K55, N80, M65, L80, C90, C95, T59, P110, Q125.   1.What is N80 pipe? N80 steel pipes are generally petroleum casing pipes. N80 oil casing is an important equipment for oil drilling. Its main equipment also includes drill pipes, core pipes and casings, drill collars and ... Continue reading →

Galvanized angle steel has the characteristics of good corrosion resistance and beautiful appearance. It is widely used in: curtain wall materials, power towers, communication towers, shelf construction, railways, highway protection, street light poles, marine components, construction steel structural components, substation ancillary equipment, Light industry, etc.   Galvanized angle steel can be divided into hot-dip galvanized angle steel and cold-dip galvanized angle steel according to process classification. Commonly seen in the market is hot-dip galvanized angle steel. Cold-dip galvanized angle steel generally needs to be processed by cold plating according to user needs. According to the side length, it can be divided into galvanized equal angle steel and galvanized unequal angle steel. Hot-dip galvanizing is divided into blow plating and rack plating. The surface quality of galvanized angle steel is stipulated in the standard, and it is generally required that there should ... Continue reading →

1.What is angle steel? Angle steel, commonly known as angle iron, is a long strip of steel with two sides perpendicular to each other.   Angle steel can be composed of various stress-bearing components according to different needs of the structure, and can also be used as a connector between components. Widely used in various building structures and engineering structures, such as house beams, bridges, transmission towers, lifting and transportation machinery, ships, industrial furnaces, reaction towers, container racks, cable trench supports, power piping, busbar support installation, and warehouses Shelves etc. Angle steel is a carbon structural steel used in construction. It is a simple cross-section steel material. It is mainly used for metal components and factory building frames. It requires good weldability, plastic deformation performance and certain mechanical strength during use. The raw material billet for the production of angle steel is low carbon square steel ... Continue reading →

Non-destructive testing of seamless steel pipes is an inspection technology that detects internal or external defects without damaging the steel pipe. In recent years, it has been widely used by major seamless steel pipe manufacturers. The non-destructive testing technologies used in the production of seamless steel pipes mainly include ultrasonic flaw detection, magnetic flaw detection, eddy current flaw detection and penetrant flaw detection. Various flaw detection methods have their own scope of use. This article will describe the eddy current flaw detection method for seamless steel pipes.   1. What is eddy current flaw testing of seamless pipes? (1) Seamless pipe means With the rapid development of the construction industry, the demand for seamless steel pipes is increasing. Seamless pipes are steel pipes without welds. Compared with welded pipes, seamless pipes have higher precision and stronger corrosion resistance, but the cost It is also higher. Common materials include ... Continue reading →

Steel casing pipe is a type of piping equipment used in the oil and gas industry for drilling, production, transportation and control of well fluids. It is usually a long steel pipe installed in oil or natural gas wells to maintain the wellbore structure. The integrity of the well, control of fluid transport, and isolation of fluids in different formations in the well. Petroleum casing has the functions of protecting the wellbore, controlling fluids in the well, and isolating formations.   The industrial chain of the casing industry includes multiple links, covering all stages from raw material procurement to final product manufacturing and services. The synergy of the entire industry chain enables oil casing to meet the needs of the oil and gas industry, from exploration to production and Transportation, providing important support for the construction and maintenance of oil and natural gas wells. Casing is lowered section by section in the wellbore by a drilling machine. The ... Continue reading →

With the rapid development of our country's economy and the continuous progress of industry,  steel casing pipe is widely used in various industries, promoting economic development. Oil casing manufacturers now have the ability to produce high-quality oil casing, providing more choices for various industries.   How should oil casings of different diameters be connected? Usually, casings of different specifications, models and materials have different connection methods.   For steel casing pipes whose length does not exceed 10m or whose diameter is less than 25mm, internal threads or external threads are generally used for connection. As for larger oil and casing pipes, since their internal structures are relatively complex, direct docking can also be chosen based on the actual situation. In addition, during the installation process, attention should also be paid to the sealing requirements at the interfaces at both ends of the oil casing to ensure the quality of the ... Continue reading →

With the development of industry and technology, stainless steel welded pipes have been popularized in all walks of life, and the number of users using 304 stainless steel welded pipes is also gradually growing. What are the advantages of 304 stainless steel welded pipe? Today I have listed 3 main advantages to share with you.   1. What is 304 stainless steel welded pipe? 304 stainless steel welded pipe is a high-strength, corrosion-resistant pipe. It has a smooth surface, compact structure, good corrosion resistance and wear resistance, can resist the erosion of various corrosive media, and has good heat resistance and Impact resistance, can resist the erosion of high temperature and impact. 304 stainless steel welded pipe has a wide range of applications. It can be used in petroleum, chemical, electric power, metallurgy, heat, hot water, air conditioning, gas, water treatment and other industries, as well as in automobiles, ships, aircraft, machinery manufacturing and other ... Continue reading →

There are many types of steel pipes, among which seamless steel pipes and stainless steel pipes are the two categories with the widest application fields. Seamless steel pipe is one of the important raw materials in economic construction and is known as the "blood vessel" of industry. It is widely used as pipes in the mechanical industry, petroleum geology industry, chemical industry, power station boilers and heat exchanger pipes, etc.   Stainless steel is known as a compound of iron and carbon, with a main chromium content ranging from 10.5 - 11.5%. Stainless steel seamless pipes were formed in the 19th century, but it was not until the early 20th century that stainless steel seamless pipes became mass-produced and widely used. The secret to the stain-fighting properties of chromium content is discovered. When chromium comes into contact with an oxide called chromium oxide, it surrounds the steel and provides a barrier against corrosion. Whenever the chromium oxide ... Continue reading →

What are steel sheet piles? What are the uses of steel sheet piles in real life? Steel sheet pile refers to the steel used in bank protection projects, mining projects, and steel sheet pile construction foundation projects. Steel sheet piles mainly include thin sheet piles, composite support piles, and tubular support piles. Nowadays, with the continuous development trend of our lives, our use of steel sheet piles has become the most common and widely used building material in today's life. There are many issues that require our attention during the construction of steel sheet pile projects. From the production of steel sheet piles to the installation, users do not need to prepare materials. Through the strict organization of steel sheet pile construction personnel, the construction speed is faster. In on-site operations, there is no wet work, which is more in line with the needs of modern engineering development. Prefabricated fences are environmentally friendly, removable, and ... Continue reading →

ERW steel pipe inner surface defects 1. Fold inward Characteristics: linear, spiral, or semi-helical jagged defects appear on the inner surface of the steel pipe.   cause: 1) Tube blank: The center is loose and segregated; the shrinkage cavity remains serious; non-metallic inclusions exceed the standard. 2) The tube blank is heated unevenly, the temperature is too high or too low, and the heating time is too long. 3) Perforation area: The head is severely worn; the parameters of the perforator are improperly adjusted; the perforation roller is aging, etc.   Inspection and Judgment: Inward folds are not allowed on the inner surface of steel pipes. Inward folds at the end of the pipe should be repaired or re-cut. The actual wall thickness at the ground should not be less than the minimum value required by the standard; full-length inner folds will be deemed scrapped. 2. Internal scarring Features: The inner surface of the steel pipe shows scars, which generally do not take ... Continue reading →

With the rapid development of the petroleum industry, severe corrosion of casings, buried pipelines, tank bottoms, especially casings has had a serious impact on the production, development, management and environment of oil fields.   Oil well casing is an additional layer of protection in order to protect the internal main oil pipeline from being squeezed by the stress of the external stone and soil layers and enhance its transportation stability. Since oil wells are thousands of meters deep underground, the deep soil casing is under tremendous pressure. With the long-term use of pipelines, oil well casings will suffer varying degrees of corrosion, holes, fractures, deformation, ruptures, and serious or even damage after a minimum of 16 months and a maximum of 5 years. This can cause significant losses to the well's performance.   1. Casing corrosion problem Corrosion exists in both the inner and outer casing walls of oil and gas wells, among which internal corrosion is ... Continue reading →

1. Basic situation of Larsen steel sheet piles (1)Origin of the name   English name: Lassen Steel Sheet Pile or Lassen Steel Sheet Piling. Because many people in China are accustomed to referring to channel steel as steel sheet pile, in order to distinguish it from channel steel, it is translated as Larson steel sheet pile.   (2)Use Larson steel sheet piles have a wide range of uses. In permanent structures, they can be used in docks, unloading yards, embankments, retaining walls, retaining walls, breakwaters, diversion embankments, docks, gates, etc.; in temporary structures, It can be used for mountain closure, temporary bank expansion, flow interruption, bridge cofferdam construction, large pipeline laying, temporary ditch excavation, soil retaining, water retaining, sand retaining, etc.; in flood fighting and rescue, it can be used for flood control, collapse prevention, quicksand prevention, etc. .   (3) Product specifications According to the cross-sectional shape ... Continue reading →

High-frequency straight seam welded pipe (ERW welded pipe) sizing means that the welded pipe is rolled through specific passes of roller butt welding, and the round pipe or special-shaped pipe with irregular size and shape is adjusted into a finished pipe. Regular shapes and sizes that meet standard requirements. There are four basic functions of diameter technology.   1. Determine the basic size and shape of the welded pipe (1) Circle→Circle, by adjusting the sizing round roller, the irregular round tube sized after the extrusion roller is adjusted into a finished round tube with qualified cross-sectional shape and size. Measuring the roundness of a pipe depends not only on the distribution of the actual tolerance zone, but also on the ovality of the pipe. The ovality is generally 80% of the limit deviation. In practice, although some welded pipes do not exceed the tolerance, they exceed the ovality tolerance or tolerance zone and are close to the limit value. , this also ... Continue reading →

When cold-drawn seamless pipes become rusty, tools such as wire brushes are mainly used to polish the steel surface to remove loose or lifted oxide scale, rust, welding slag, etc. The rust removal of hand tools can reach Sa level, and the rust removal of power tools can reach Sa3 level. If there is a strong iron oxide scale attached to the surface of the steel and the tool rust removal effect is not satisfactory, pickling or spray (throwing) rust removal can be used. method.   1.Pickling Generally, chemical and electrolytic methods are used for pickling treatment. Cold-drawn seamless pipes only use chemical acid for anti-corrosion.   Washing can remove scale, rust, and old coatings. Sometimes it can be used as a reprocessing after sandblasting and rust removal. Although chemical cleaning can achieve a certain degree of cleanliness and roughness on the surface, the uneven lines are shallow and can easily pollute the environment.   2. Spray (throw) rust removal Spraying ... Continue reading →