This article will discuss the bending radius and related limiting requirements of ERW pipe to help understand and correctly use ERW pipe. 1 Overview of bending radiusThe bending radius refers to the radius of curvature used when bending the pipe, and can also be understood as the minimum bending radius of the pipe during the bending process. The size of the bending radius directly affects the bending performance and service life of the pipe. Generally speaking, the smaller the value of K, the smaller the bending radius, and the better the bending ability of the pipe. 1 Bending radius and pipe bending abilityThe size of the bending radius directly affects the bending ability of the pipe.

The production process of straight seam welded pipe is simple, the production efficiency is high, the cost is low, and the development is rapid. The forming process of a straight seam steel pipe involves the following steps:1. Heat Treatment (optional): Depending on the application and requirements of the steel pipe, heat treatment may be applied to improve the material's properties. Cutting and Beveling: The straight seam steel pipe is cut to the desired length and may have its ends beveled for welding purposes if necessary. However, the general steps mentioned above represent the typical process for producing straight seam steel pipes.

Compared with welded steel pipes, seamless steel pipes are lighter in weight when they have the same flexural and torsional strength, and are economical section steels. , use steel pipes to make ring partsTo avoid quality problems with seamless steel pipes, it is important to implement thorough quality control measures throughout the procurement and production process. Select reputable suppliers: Choose established and reputable suppliers known for delivering high-quality seamless steel pipes. Production process control: Ensure that the manufacturing process of seamless steel pipes is carefully controlled and monitored. Encourage open communication and collaboration to resolve problems, implement corrective actions, and drive continuous improvement in the quality of seamless steel pipes.

The welded pipe is a steel pipe made of steel plate or strip steel after being crimped and welded, generally with a length of 6 meters. The production process of welded steel pipe is simple, the production efficiency is high, there are many varieties and specifications, and the investment in equipment is small, but the general strength is lower than that of seamless pipe. If the wall thickness of the steel pipe is relatively thin, high-frequency welding can be used; for some thin-wall steel pipes, protective gas welding can be used, and for thicker steel pipes, manual arc welding can be used. If the steel pipe is a high-strength alloy steel with good wear resistance, temperature resistance, and pressure resistance, the welding process must be implemented to avoid cracking tendencies due to high-temperature welding operations. Compared with the welded pipe, the steel pipe dimension can reach 650mm, and the minimum diameter is 0.

Socket welding connectionThis is to insert the stainless steel pipe into the pipe fitting, and then extend the stainless steel pipe fitting in a circle for argon arc welding connection, so that the stainless steel pipe fitting will self-melt into one body. However, in the production process of socket welded stainless steel pipe fittings, the joint positions of the stainless steel pipe fittings are expanded through a water expansion process similar to the compression stainless steel pipe fittings. Threaded connectionThe threaded type uses stainless steel pipe fittings and stainless steel pipes to be tightened directly like screws. Generally speaking, the connection method of threaded bolts is not suitable for the use of thin-walled stainless steel pipes. Summarize:The above six connection methods each have their own advantages and disadvantages, but the most commonly used connection method for thin-walled stainless steel pipes is the double-pressure connection.

Compared with welded steel pipes, seamless pipes are lighter in weight when they have the same bending and torsional strength, and are an economical section steel. Weld defects: Seamless tubes are typically produced without welding. Weld defects such as porosity, cracks, or incomplete fusion can compromise the structural integrity of the seamless tube. Residual stress: During the manufacturing process, residual stresses can develop within the seamless steel tube structure. Additionally, proper heat treatment, material selection, and process optimization can help minimize the occurrence of these defects and enhance the overall quality of seamless steel tubes.

Compared with solid steel such as round steel, the steel pipe is lighter in weight when the bending and torsional strength is the same, and it is an economical section steel. Different performanceIn terms of corrosion resistance, pressure bearing and high temperature resistance, seamless steel pipes are better than welded pipes. Different pricesSeamless steel pipes are more expensive than welded pipes because the production process of seamless steel pipes is more complicated and its cost is higher. When purchasing seamless steel pipes, everyone should check whether the specifications and models of seamless steel pipes meet the requirements. When purchasing seamless steel pipes, we need to pay attention to the quality of the steel pipes.

The welding process used for submerged arc welding straight seam steel pipes is submerged arc welding technology to produce welded pipes, which are welded with fillers and submerged arc particles to protect the flux. LSAW is the English abbreviation of submerged arc welding straight seam steel pipe. The production technology of submerged arc welding straight seam steel pipe includes JCOE forming technology and rolling forming submerged arc welding technology. Requirements for welding temperature of straight seam steel pipe:The material is low-carbon steel, and the welding temperature is controlled at 1250~1460°C, which can meet the penetration requirements of 3~5mm pipe wall thickness. The welding process parameters of thick-walled straight seam submerged arc welded steel pipe mainly include: linear energy, welding current, welding voltage, welding speed, welding wire spacing, groove size, etc.

According to the production method, seamless tubes are divided into hot-rolled tubes, cold-rolled tubes, cold drawn seamless tubing, extruded tubes, jacked tubes, etc. The importance of the outer diameter of seamless steel pipeThe outer diameter of the seamless steel pipe directly affects the pressure bearing capacity and fluid transmission efficiency of the piping system. How to choose the appropriate outer diameter of seamless steel pipe(1)Pipeline design requirements: First, we need to determine the outer diameter of the seamless steel pipe according to the specific pipeline design requirements. According to different corrosion environments, seamless steel pipes of different materials can be selected, such as stainless steel, alloy steel, etc. SummaryThe selection of the outer diameter of the seamless steel pipe is very important to the quality and safety of the project.

Recognizing the tempering temperature in the heat treatment of seamless steel pipes typically involves using specific techniques or tools to determine the achieved temperature. The temperature control settings can be adjusted to achieve the desired tempering temperature. By conducting hardness tests on the steel samples after tempering, it is possible to correlate the achieved hardness with the tempering temperature. For example, certain microstructural features, such as the presence of specific precipitates or grain size characteristics, can indicate the tempering temperature range. It is crucial to follow established heat treatment procedures and guidelines to ensure the desired properties are achieved in the seamless steel pipes.

The welded pipe is a steel pipe made of steel plate or strip steel after being crimped and welded, generally with a length of 6 meters. The production process of welded pipe is simple, the production efficiency is high, there are many varieties and specifications, and the investment in equipment is small, but the general strength is lower than that of seamless steel pipe. The phosphating of seamless or welded pipes is a process of chemical and electrochemical reactions to form phosphate conversion coatings. It can play a great role in improving the rust resistance of steel pipes. Therefore, when considering the process interval of square rectangular tubes, an appropriate interval should be selected according to the situation.

High-frequency longitudinal welded pipe (ERW pipe) is a hot-rolled coil formed by a forming machine. Mainly used in water supply engineering, octg pipe, petrochemical industry, chemical industry, electric power industry, agricultural irrigation, urban construction, etc. According to the stress state of the component, supply conditions, production and processing conditions and cost, the structure of the steel pipe can be a round pipe structure or a rectangular pipe structure, or a mixture of the two steel pipes. When used in combination, generally the chord is a rectangular tube, and the web is a round tube. Advantages of high frequency longitudinal seam welded pipe:1) The geometric characteristics of the straight seam steel pipe section are good, the pipe wall is generally thin, the section material is distributed around the center of mass, the section radius of gyration is large, and the torsional rigidity is large.

Widely used in water supply engineering, petrochemical industry (octg pipe), chemical industry, electric power industry, agricultural irrigation, urban constructionThere are many processes in the processing of welded pipes, and we need to pay attention to every detail. The heat treatment of welded steel pipes is a very important link in the processing of welded steel pipes. This phenomenon is affected by factors such as cooling rate, material composition and heat treatment process. In order to make the welded pipe have the required mechanical properties, physical properties and chemical properties, in addition to the reasonable selection of materials and forming processes, the heat treatment process is often essential. and their alloys can also change their mechanical, physical and chemical properties through heat treatment to obtain different performance.

Compared with welded steel tubes, seamless pipes are lighter in weight when they have the same bending and torsional strength, and are an economical cross-section steel. Manufacturing seamless pipes with accurate diameters requires precise control and adherence to specific processes. Piercing or Extrusion: Seamless pipes are typically produced using either the piercing or extrusion method. Finishing Processes: Finishing processes like grinding or polishing may be applied to achieve the final accurate diameter and improve the surface finish of the seamless pipe. It's important to note that maintaining accurate diameter during the seamless pipe manufacturing process requires precise control of various parameters, including temperature, pressure, speed, and tooling.

At present, the development trend of pipeline transportation is: the diameter of pipeline is constantly increasing, and the transportation capacity is greatly improved;The main advantages can be roughly summarized as:(1) Large volume of transportation. The transportation pipeline is usually buried underground, which occupies very little land; the construction practice of the transportation system has proved that the part of the transportation pipeline buried underground accounts for more than 95% of the total length of the pipeline. Therefore, pipeline transportation is the most energy-saving transportation method under anhydrous conditions. Theoretical analysis and practical experience have proved that the larger the diameter of the pipeline, the longer the transportation distance, the larger the transportation volume, and the lower the transportation cost. Taking oil transportation as an example, the ratio of transportation costs among pipeline transportation, waterway transportation and railway transportation is 1:1:1.

Large diameter straight seam steel pipe (LSAW pipe) produces finished products with guaranteed quality, high efficiency and low cost, and relying on the advantage of a vertical weld, it quickly entered the large diameter steel pipe market. The quality can meet the needs of transportation pipelines, piling, steel support, subway columns, octg pipe, steel pipe piles, etc. Generally, the straight seam steel pipe factory is the stock plate or the steel plate fixed by the steel factory, and the delivery cycle is long. Large-diameter straight seam steel pipes are often used in piling, bridge, support and other projects. If the steel pipes cannot arrive, the project will be delayed and the workers will not be able to work, which will cause economic losses.