First, an introduction to H-beams. H-beams, also known as I-beams, are economical profiles with more optimized cross-sectional area distribution and a more reasonable strength-to-weight ratio. It is named because its cross-sectional shape is similar to the letter "H". The inner sides of the two out

Carbon steel pipe is a commonly used industrial pipe, which is widely used in construction, manufacturing, and other fields due to its low price and high strength. However, carbon steel pipes are prone to rust problems, which will affect their service life and aesthetics if not treated in time. So,

Bestar steel co., ltd will participate in the Tube Dusseldorf exhibition in Germany from April 15 to 19, 2024.

Understanding of thick-walled steel pipes: Thick-walled steel pipes, steel pipes whose outer diameter to wall thickness ratio is less than 20 are called thick-walled steel pipes. It is mainly used as petroleum geological drilling pipes, cracking pipes for the petrochemical industry, boiler pipes, b

Welding steel pipe is a common process that plays an important role in the construction, manufacturing, and repair fields. However, when performing welding operations, we need to pay attention to some key things to ensure welding quality and safety. First of all, the preparation before welding th

Cold-drawn seamless steel pipe technology plays an important role in the steel industry. It is a key process for manufacturing high-quality steel pipes. Cold-drawn seamless steel pipes have excellent mechanical properties and high-precision dimensions and are widely used in the petroleum, chemical i

1. Anti-corrosion performance of galvanized square steel pipe Galvanized square steel pipe is obtained by hot-dip galvanizing ordinary square steel pipe, and its surface is covered with a layer of zinc. This layer of zinc can effectively prevent the square steel pipe from contacting the external en

There are three most commonly used welding methods for stainless steel: manual welding (MMA), metal arc welding (MIG/MAG), and tungsten inert gas welding (TIG). While these welding methods are familiar to most people in the stainless steel industry, we feel this area deserves a closer look. 1. Ma

1. Mechanical cutting adopts external installation and internal installation. It uses the turning tool processing principle to cut and bevel the pipe mouth. The single machine has a large span, can process large thicknesses, has less waste, is pollution-free, and does not produce high temperatures during the processing. It does not affect the pipe material and is conducive to welding. Water cutting uses a high-pressure pump and emery to process pipes. Its cuts are clean and the processing span is large. However, its efficiency is low and the processing thickness is seriously limited. 2. Oxyacetylene flame cutting, by adjusting the oxygen valve and acetylene valve, the mixing ratio of oxygen and acetylene can be changed to obtain three different flames: neutral flame, oxidizing flame, and carbonizing flame. 3. Ion cutting, plasma cutting with different working gases can cut various metals that are difficult to cut with oxygen cutting, especially for non-ferrous metals (stainless steel, aluminum, copper, titanium, nickel), the cutting effect is better; its main advantage is the cutting thickness When cutting small metals, plasma cutting speed is fast, especially when cutting ordinary carbon steel thin plates, the speed can be up to 5 to 6 times that of oxygen cutting. The cutting surface is smooth, the thermal deformation is small, and there is less heat-affected zone.

1. The end of the steel pipe is coated with warped edges. Coating warping is divided into the warping produced during the production process and the long-term stacking process. There are three common forms: ①The overall coating is warped, and the epoxy powder of the bottom layer is peeled off the contact surface of the steel pipe; ②The intermediate adhesive layer is debonded from the epoxy powder layer, causing warped edges; ③The outer polyethylene coating is debonded from the middle adhesive layer, causing the surface to lift. There are common factors as well as individual factors in the production of curling. 2. Surface pitting. The surface of the coating presents a hemispherical or semi-ellipsoidal bulge with a diameter of about 2-5mm, forming uneven pitting, which seriously affects the apparent quality of the protective coating. 3. The coating at the weld is thinned or cracked. Spiral welded or straight seam welded steel pipes, after three-layer PE layer forming, the coating at the weld is thinned or torn. The weld reinforcement exceeds the standard. When the plastic with the same width of the extrusion die is coated on the steel pipe, the coating formed in the weld zone is too thin, and its cooling shrinkage residual stress accumulates in the thin zone, due to the heat storage capacity of the weld zone After cooling and forming, the residual heat accumulated in the weld zone will heat the coating in this zone again through thermal conduction, resulting in a decrease in the strength of the coating in this zone. If the weld surface is rough, such defects will be more obvious. 4. Drum bag defect. The bulging of the protective layer not only affects the apparent quality of the steel pipe but also indicates that the adhesion and cathodic dependability of the protective layer and the surface of the steel pipe are reduced. The main reason is that the amount of water in the coating cooling and shaping process is insufficient. After the spray cooling is completed, the residual heat inside the steel pipe is much greater than the Vicat softening point of the coating. 5. Surface wrinkles. In the three-layer PE molding process, no matter whether the coating method or the winding method is used, there is an air layer at the interface between the primer and the polyethylene film and the steel pipe. Before coating, this air layer must be eliminated, otherwise air bubbles will be formed and passed through the silicone rubber pressure roller. With rolling or water cooling, the bubbles will collapse, form wrinkles, and sometimes burst. In the winding method, the air bubbles need to be driven out by a special silicon rubber roller, but the rolling process can easily cause coating defects. 6. Adhesion and cathodic peeling. In the adhesion or cathodic peel test of the finished tube, the coating part of the whole is peeled off, and the product does not meet the standard at all. In the coating molding process, if the primer has been cured and then the primer is wrapped (covered), the adhesion between the powder and the primer will be drastically reduced; after molding, the rapid water cooling of the powder before curing will cause the material properties to change, It is easy to reduce the bonding force; the surface of the steel pipe is not cleaned, which can also cause such defects. 7. Raw material issues. ①Polyethylene raw materials absorb moisture, or raw materials contain excessive recycled materials or excessive additives. During the extrusion process, the fishnet-like membrane will be extruded. ②When the flow rate of the primer melt is lower than the standard, the resulting primer film is super thick and has low ductility, which reduces the adhesion to the powder layer and polyethylene. ③The particle size distribution of the epoxy powder exceeds the standard, resulting in a low powder loading rate; the powder's applicable temperature range is narrow, and the gelation and curing time is short, resulting in poor bonding between the powder primer and the primer.

1. Petroleum: Petroleum pipelines, process pipelines for transporting corrosive media in chemical and pharmaceutical, printing and dyeing industries; 2. Fire protection: Applicability to water supply pipelines of sprinkler and sprinkler systems; 3. Expressways: cable protection sleeves for power, communications, and expressways; 4. Coal mines: suitable for underground water supply and drainage, the underground spraying, positive and negative pressure ventilation, gas drainage, fire sprinkler, and other pipe networks; 5. Sewage treatment: sewage treatment discharge pipe, sewage pipe, and biological pond anti-corrosion project; 6. Power plant: process water waste residue and return water pipeline in thermal power plant; 7. Agriculture: agricultural irrigation pipes, deep well pipes, drainage pipes, and other networks; 8. Municipal engineering: suitable for high-rise building water supply, heating network heating, tap water engineering, gas transportation, buried water transportation, and other pipelines.

In the construction industry, carbon steel forged fittings are used for structural support and reinforcement.

1. Make the structure and composition of the steel pipe uniform, which is especially important for the raw materials, because the rolling temperature and cooling rate of each section of the hot-rolled wire rod are different, resulting in inconsistent structure. At high temperatures, the atomic

Stainless steel is a well-known and most commonly used metal for tubing development due to its versatile chemical composition and properties. Stainless steel is available in a variety of grades, materials and specifications to meet all industrial needs. SS 304 is one of the most widely used non-magnetic and austenitic stainless steels, suitable for the manufacture of all types of piping. 304 stainless steel tubing and 316 stainless steel tubing are available in various forms such as seamless, welded and flanges.

According to the requirements of the anti-corrosion coating standard for the appearance of large-diameter submerged arc steel pipes, the surface disposal methods of submerged arc steel pipes are improved from time to time 1. Cleaning Use solvents and emulsions to clean the surface of the steel to remove oil, grease, dust, smoothing agent and similar organic matter, but it cannot remove the rust, oxide scale, welding flux, etc. on the surface of the steel, so it is only used as an auxiliary in anti-corrosion homework The trick is also one of the simple maintenance tricks. 2. Pickling Generally, two methods of chemical and electrolysis are employed to pickling. Pipeline anticorrosion only uses chemical pickling, which can remove the oxide scale, rust, and old coatings. Sometimes it can uses as sandblasting and rust removal. Although chemical cleaning can make the appearance reach a certain degree of cleanliness and roughness, its anchor pattern is shallow, and it easily pollutes the surrounding conditions, Meide Steel Control Manufacturing Co., Ltd. recommends against this method. 3. Derusting things Use wire brushes and other things to polish the surface of the steel to remove loose oxide scale, rust, welding slag, etc. Hand-operated tools can reach the Sa2 level for rust removal, and power tools can reach the Sa3 level for rust removal. If the steel surface has adhered to a strong oxide scale, the results of rust removal of the tool will not be expected, and the anchor pattern depth required for anti-corrosion construction cannot be reached. Compared with the original rust removal method. 4. Radiation derusting Radiation rust removal is a high-power motor that drives the radiating blades to twist at a high speed, so that steel shots, steel grit, iron wire segments, minerals, and other abrasives are radiated to the surface of the submerged arc steel pipe under the effect of the strong centrifugal force of the motor, which can not only remove oxides, Rust and dirt, and the submerged arc steel pipe can reach the required average roughness under the effect of the fierce abrasive impact and friction. It is a relatively complete method for removing rust. It is strongly recommended by Meide Steel Control Manufacturing Co., Ltd. After radioactive rust removal, not only can be the physical adsorption effect of the pipe surface be expanded, but also the mechanical adhesion effect of the anti-corrosion layer and the pipe surface can be enhanced. Therefore, radiation rust removal is a fantasy rust removal method for pipeline anticorrosion. Generally speaking, shot blasting should be employed to internal and external surface treatment of pipes, and shot blasting should be used for surface treatment of submerged arc steel pipes.

Material API standard J55,K55,N80,L80. Stainless steel 304, 304L, 306, 316. Low carbon steel. Hole Arrangement Parallel, Spiral

8. FFX molding (flexible molding). New technology improved based on FF molding technology by Japan's Nakata Machinery Manufacturing Research Institute. The deformation is focused on the edge of the rough forming section so that the edge bends to about 30% of the width of the steel strip, and at the same time, more than 80% of the total deformation of the steel strip is uniformly completed in the rough forming section, and each forming roll in the rough forming section The pass patterns adopt a set of continuously changing multi-curvature curves, which contain the pass patterns that can be produced for welded pipes so that only one set of forming rolls can produce products of different specifications, which reduces the number of forming stages and roll changing time. 9.TPF three-point bending forming. According to the law of transformation of longitudinally welded pipes, the partial forming method is adopted. The first step uses "W" to shape the edge of the strip; the second horizontal roll bends the middle of the strip to make the strip a "U" shape; the third horizontal roll is curved "U" The two straight sides of the ”shape make it close to the double-radius section and send the strip steel to the vertical roll formation for rounding deformation. 10.UO molding. The edge of the steel plate is pre-bent as required and then molded by a U-forming machine and O-forming machine twice. The circumferential compression deformation (0.2%~0.4%) occurs in the O forming so that the circumferential residual stress of the open pipe is evened. Then the O-shaped tube blank is welded and then cold expanded. It is characterized by large production capacity, with an annual production capacity of 300 to 1 million tons, which is suitable for single-scale mass production and a relatively large investment. 11.JCO molding. The progressive bending pressure forming first presses one half of the steel plate into a J shape and then presses the other half of the steel plate into a J shape. After multiple compressions, a C shape is formed, and finally, an open O-shaped tube is formed from the middle. Then expand the diameter of the O tube after cooling. The steel pipe has great flexibility in production, which is especially suitable for the production of medium-diameter thick-walled pipes with less investment. 12. RB forming (roll forming). The steel plate is rolled and bent many times between three rollers and four rollers, and finally bent into the required cylindrical shape. This process appeared earlier and is mostly used to produce pressure vessels, structural pipes, and water pipes with larger outer diameters (up to 4500mm) and shorter lengths (3~6m), with poor dimensional accuracy and lower productivity. 13. Spiral welded pipe is formed in front swing type. The steel belt in front of the former swings as a whole to adjust the forming angle. The unit does not have loops and occupies a small area, but it can only produce intermittently (roll-to-roll or stop at opposite ends). 14. Spiral welded pipe back swing forming. The steel pipe bridge swings after the former to adjust the forming angle. Usually, there are loopers to ensure continuous production, occupying more land, and more equipment.

1. The cost of infrastructure is low. Compared with railway transportation, the cost of infrastructure can be saved by three points, and the transportation volume is twice that of the railway. 2. Simple construction, fast construction speed, generally laid underground, reliable and adaptable to various terrain. 3. The transportation operation cost is low, and it can be highly automated. Compared with other transportation methods, longitudinally welded pipe transportation is cheap, and the freight is only about 10% of the railways and about half of the waterway. At present, the proportion of oil and gas transported by longitudinally welded pipes in the world is increasing, accounting for about 75%-95% of the total oil and gas. At present, the scope of transportation is gradually expanding, not only oil and gas, but also various chemical raw materials and Products, and has been studying the use of longitudinally welded pipes to transport solids. The development direction of longitudinally welded pipe pipeline transportation points to the direction of large diameter and high pressure.