Seamless Steel Pipe

　　 Galvanized Steel Pipe Solvent Treatment 　　1, the steel pipe into the solvent tank, the tape to relax all the steel immersed in the solvent, does not allow the steel pipe surface exposed solvent surface. Such as steel pipe at both ends do not take bubbles so far, and then lifting the side of the pipe vibration up, lifting the steel pipe control solvent into the drying rack. 　　2, steel pipe in the solvent treatment process, the tilt angle of steel pipe is not greater than 15 °. 　　3, the pipe immersed in the solvent time of 60 to 120 seconds, on duty back to the tube soak 3 to 5 minutes, successor to the plating tube soak 5 to 10 minutes. 　　4, solvent temperature: keep the solvent clean at room temperature. 　　5, the solvent-treated steel pipe, do not stick to other dirt, do not pour Sheung Shui, placed in the drying platform balance; placed on the drying bench steel pipe, pipe is not allowed to go to the top, such as must be up , The feet must be coated with ammonium chlorid...

　　The so-called SS pipe is a kind of long and round hollow steel bar. It is famous for the following features: reliability, economy, convenience and hygiene and so on. Therefore, this pipe is widely used in a lot of projects and other pipes can not replace its functions at all. 　　This pipe is made up of two categories namely stainless steel pipe without seam and stainless steel welded pipe. According to different manufacturing technologies, it can be separated into the following types: hot rolling, extrusion, cold drawing and cold rolling. Besides, on basis of the form of section, the SS pipe can also classified into circular pipe and deformed pipe including square, rectangular, semi-circular, hexagonal, triangular, octagonal and so on. 　　With the rapid development of economy, a great number of houses, public constructions and travelling facilities are built, so there is new requirement for the hot water supply and domestic water supply. Especially for the quality of water, people...

　　High carbon steel is a carbonaceous material with a carbon content of 0.6 to 1.7%, a density of 7.81 g/cm3, and a hardness of HRC 60 to 65. It is often called a tool steel and is usually quenched and tempered. Since the carbon content is high and water quenching is prone to cracking, double-liquid quenching is often used, and small parts are often oil quenched. High carbon steel has poor weldability. In addition to high carbon structural steel, there are also high carbon steel castings and carbon tool steels. These steel mills are used as parts and tools for high hardness or wear parts, mostly for repair and surfacing. High carbon steel is more likely to produce hot cracks than medium carbon steel. High carbon steel is more sensitive to quenching. The heat affected zone during welding and the hardened martensite structure are prone to occur, so the tendency of hardening and cold cracking are great. High carbon steel has poor thermal conductivity at the bottom of the carbon steel. Th...

　　 Seamless steel pipe pickling passivation process steps 　　Washing→degreasing to oil→washing→second oil removal→hot water washing→acid washing→water washing→neutralization→water washing→chromic anhydride immersion second time ash→water washing→passivation→hot water washing→drying→checking→sealing → Brush primer → custody 　　Operation process 　　Washing: rinsing the inner and outer sludge of the pipe with a normal temperature water of not less than 0.5 MPa, degreasing and degreasing; 　　Heating with 3% caustic soda solution to 80°C for 2h → water washing; 　　Using normal temperature water with a pressure not lower than 0.5 MPa Rinse → second degreasing and de-oiling; 　　Use trisodium phosphate, sodium carbonate, water glass, petroic acid 6% to 70°C~90°C for 30 min → hot water wash; 　　Soak with warm water at 50°C ~ 60°C for 3 ~ 5 min → acid Washing; 　　Immersing with 15% sulfuric acid and 0.2% inhibitor solution at room temperature for 2h → water washing; 　　Rinsing residual...

　　There are generally five categories of square tube performance: 　　 Plasticity 　　Plasticity refers to the ability of a metal material to undergo plastic deformation (permanent deformation) without damage under load. 　　 Hardness 　　Hardness is a measure of the hardness of a metal material. At present, the most commonly used method for measuring hardness in production is the indentation hardness method, which presses the surface of the metal material to be tested under a certain load with a certain geometry of the indenter, and determines the hardness value according to the degree of being pressed. Commonly used methods are Brinell hardness (HB), Rockwell hardness (HRA, HRB, HRC) and Vickers hardness (HV). 　 　Impact toughness 　　The load acting on the machine at a large speed is called the impact load, and the ability of the metal to resist damage under the impact load is called impact toughness. 　　 Fatigue 　　The strength, plasticity, and hardness discussed above are all i...

　　In the high frequency welding process of production, in order to ensure that the product quality of the high frequency welded pipe meets the requirements of the technical standards and the needs of the customers , we need to analyze the factors that affect the product quality in the steel pipe production process. 　　Through a month of nonconforming product statistics of Φ76mm high frequency welded steel pipe unit, We believe that the factors that affect the quality of steel pipe products in the production process include raw materials, welding technology, roll adjustment, roll material, equipment failure, production environment and other reasons, etc. Among them, raw materials, welding technology, roll adjustment are key links, 32.44%, 24.85% and 22.72% respectively, the sum of the three links accounted for 80.01%. And the other four elements of the impact on the quality of steel products accounted for 19.99%, are relatively minor links, including roll material, equipment failure, p...

　　We've mentioned that roll adjustment had a great influence on ensuring the quality of high frequency welded pipe in the process of production, so now we can talk about techniques of roll adjustment when changing roll. 　　1) Replace the steel pipe specifications, we generally replace a complete set of roll. Roll adjustment method is: use a wire to pull a centerline from the unit inlet to the outlet, and make the molding line to meet the technical requirements. After changing the roll specifications, we need to make a comprehensive adjustment for forming roller, guide roller, squeeze roller, sizing roller firstly, and then focus on the adjusting the closed hole of forming roll, guide roller, squeeze roller. 　　2) The role of the guide roller is to control the direction of the pipe seam and tube's bottom line height, ease the edge of the extension, control the rebound of the edge of the tube, ensure that the pipe straight without turning into the squeeze roller. Such as the g...

　　How to ensure the quality of high frequency welded pipe in the process of production? We should take the effects of roll adjustment into consideration, except that, we also need to consider the geometric dimensions of steel strip. 　　When the width of the steel strip is less than the allowable deviation, the squeezing force of the welded steel pipe will be reduced, which will cause the welding of the steel pipe loose, and cracks or open-end pipe will appear. When the width of the strip is greater than the allowable deviation,the squeezing force will be increased when the steel pipe is welded, which will cause tip, welding or burr welding defects appearing on the weld of the steel pipe. Therefore, the fluctuation of the strip width not only affects the accuracy of the steel pipe's outer diameter, but also seriously affects the surface quality of the steel pipe. 　　About the steel pipe that requires the same section wall thickness difference does not exceed the specified value (...

　　In the historical perspective, the best point in time to addressing overcapacity is in the case of the entire industry downturn, steel prices generally loss to promote, The resistance in this time is minimal. In 2009 around, we had this opportunity, but we did not grasp, instead we took a loose policy so that a large number of excess capacity survived, and even expansion. Today, the difficulty we faced is greatly increased than in 2009. 　　From the point of view of supply-side structural reform, it is actually very necessary that iron and steel and other excess industry to address capacity. But the more important is the supply of new industries and new capacity. On the one hand, new industries and new production capacity can provide industrial base for local and support local development, which is possible to ensure the interests consistency of local and central, so that policy is resolutely and thoroughly implemented. On the other hand, new industries and new capacity provide new p...

　　The storage of seamless steel tubes requires the selection of suitable sites and warehouses, and usually requires the following conditions: 　　(1) The site or warehouse where the steel is to be stored shall be selected in a clean and well-drained place away from the factories and mines that generate harmful gases or dust. Weeds and all debris should be removed from the site to keep the steel clean. 　　(2) Do not stack materials that are corrosive to steel, such as acid, alkali, salt or cement, in the warehouse. Different types of steel should be stacked separately to prevent confusion and prevent contact corrosion. 　　(3) Large-scale steel, rail, insult steel plate, large-diameter steel pipe, forgings, etc. can be stacked in the open air. 　　(4) Small and medium-sized steel, wire rod, steel bar, medium-diameter steel pipe, steel wire and steel wire rope, etc., can be stored in a well-ventilated shed, but must be placed on the underside. 　　(5) Some small steel, thin steel, steel...

　　Production principle and technology of seamless steel tube 　　1, The principle 　　The production method of the seamless steel pipe is roughly classified into a cross rolling method and an extrusion method. 　　The former method is to first pierce the tube with a diagonal roll and then extend it with a rolling mill. This method has a high production speed, but has high requirements on the processability of the tube blank, and is mainly suitable for the production of carbon steel and low alloy steel tubes. The latter rule is to perforate the tube blank or steel ingot with a punching machine and then extrude it into a steel tube by an extruder. This method is less efficient than the cross-rolling method and is suitable for producing high-strength alloy steel tubes. Both the cross-rolling method and the extrusion method must first heat the tube blank or the ingot, and the produced steel tube is called a hot rolled tube. Steel pipes produced by hot working can sometimes be cold worked a...

　　Several days ago, Prime Steel Pipe shared the brief introduction of scaffolding pipe, I believed that those people who saw that article must have a basic understanding to scaffolding pipe. Today, Prime Steel Pipe will continue to share some information of that, its advantages and disadvantages will be listed below. 　　Advantages of scaffolding pipe : 　　1) Bearing capacity is large. When the scaffolding geometry and construction in line with the relevant requirements of the specification, under normal circumstances, the capacity that single tube of scaffolding can bear will reach up to 15kN ~ 35kN (1.5tf ~ 3.5tf, design). 　　2) Easy assembly and disassembly, erection flexible. As the length of the pipe is easy to adjust, fastener connection is simple, thus it can be adapted to a variety of flat, facade buildings and structures with scaffolding. 　　3) More economical. Processing is simple, primary investment costs is low; if carefully designing scaffold geometry, paying attention ...

　　Large diameter LSAW steel pipe with its big wall thickness, good material, stable processing technology, becomes the preferred pipe by largest domestic and foreign oil and gas transportation project. In the large diameter LSAW steel pipe welded joints, weld and heat affected zone are the most prone to produce a variety of defects, and welding undercut, pores, slag, not fused, not penetration, welding cracks are the main form of welding defects, and also are the origins those often make LSAW steel pipe produce quality accident. The quality control measures will be listed below, if you you are interested in the production process of LSAW steel pipe, you can click the hyper-link. 　　1.The quality control before welding: 　　1) First of all, pipe manufacturer should take control of the quality of raw materials, after passing the inspection, raw materials can formally enter the construction site. And pipe manufacturer resolutely put an end to the use of substandard steel. 　　2) The nex...

　　Large diameter LSAW steel pipe, also known as welded steel pipe , is made of steel plate or steel strip after bending (electric model 0317 and check 6012755 standard) and then is made of by high-frequency welding and submerged arc welding. According to the form of seam welded steel pipe is divided into LSAW steel pipe and spiral welded pipe. According to the use it is divided into general welded pipe, galvanized steel pipe, blowing oxygen pipe, wire casing, metric pipe, roller tube, deep well pump, automotive tube, transformer tube, welded thin-walled tube, welded pipe and spiral welded pipe. 　　General pipe (manufactured by Prime Steel Pipe) is used to transport low pressure fluid. Implementation of the standard is GB/T0317 No. 6012889. It is manufactured with Q195A, Q215A, Q235A steel. It can also be made of other mild steel that is easy to weld. Steel pipe must be tested by water pressure, bending, flattening and other experiments, the surface quality has certain requirements, th...

　　Spiral welded pipe (some people call it SSAW steel pipe) is also a kind of welded pipe, its strength is generally higher than the LSAW steel pipe. Spiral welded pipe with large diameter can be produced by the narrow blank, and SSAW steel pipe with different diameter can also be produced by the same width of blank. However, compared with the same length of the straight pipe, the weld length increased by 30 to 100%, and the production rate is low. Therefore, the smaller diameter of the pipe mostly use LSAW steel pipe, large diameter welded pipe mostly use spiral welded pipe. 　　The production process of spiral welded pipe 　　Spiral welded pipe is the steel pipe with spiral seam that using the strip coil as raw material, extrusion forming under normal temperature, and using automatic double wire double-sided submerged arc welding process to weld. 　　1.Raw materials are coil, wire, flux. Those must finish the rigorous physical and chemical testing before putting into. 　　2.The head ...

　　In the ERW steel pipe production, electric resistance welding played an important role. Some customer don't know clearly about electric resistance welding, so pipe manufacturer Prime Steel Pipe will share types of electric resistance welding for all of you. There are three basic types of electric resistance welding: solid state, fusion, and reflow soldering. 　　In solid state, also called thermo-compression, there are dissimilar materials with dissimilar grain structure, e.g. molybdenum to tungsten, which are joined using a very short heating time, high weld energy, and high force. There is little melting and minimum grain growth, but it has a definite bond and grain interface. Thus the materials actually are still in the solid state. The bonded materials usually has excellent shear and tensile strength, but peel strength is poor. 　　In fusion, either similar or dissimilar materials with similar grain structures are heated to the melting point (liquid state) of both. The subse...

　　May be there are many people know ERW steel pipe , but there are less people know much information of electric resistance welding. Several days ago, pipe manufacturer Prime Steel Pipe shared some information of that, such as spot welding. Today, we will continue this topic, Prime Steel Pipe will share the resistance seam welding for all of you. Resistance seam welding is a process that produces a weld at the faying surfaces of two similar metals. The seam may be a butt joint or an overlap joint and is usually an automated process. Resistance seam welding is different from butt welding and spot welding. Butt welding typically welds the entire joint at once and seam welding forms the weld progressively, starting at one end. It is the same as spot welding, seam welding relies on two electrodes, usually made from copper, to apply pressure and current. Resistance seam welding use a rotating disc-shaped electrode. It can pressurize, energize and drive the workpiece forward, forming a serie...

　　For the general enterprise, advantages of the SSAW steel pipe are that it is suitable for the manufacture of medium and below wall thickness (20mm), large diameter (1-3mm) and medium grade (X70). Its limitations are due to the spiral around the tube, the weld in the curved surface position, thus the welding is more difficult, and improving the welding speed is also not easy, the residual stress is larger. Therefore, it is difficult to improve the steel grade (X80) and to improve the wall thickness (20 mm). When the wall thickness is large (for example, 25 mm), the weight due to the weight of the coil can be manufactured, but the yield is low. 　　In order to overcome the limits of SSAW steel pipe, foreign SSAW steel pipe manufacturer adopted some measures. To eliminate the residual stress, Russia adopted the whole body heat treatment method, Canada adopted the whole pipe body mechanical expansion method; in the process of forming the process to overcome the low speed of submerged ar...

　　Galvanized steel pipe is covered with zinc material, so galvanized pipe have a stronger ability of steel pipe resistant to corrosion. Covered with zinc also can prevent the buildup of mineral and deposit of the water line. So the primary use of galvanized pipe is to carry water to homes and commercial buildings. What's more, since its resistance to corrosion, galvanized steel pipe is commonly used as scaffolding frames. 　　The dark color of black steel pipe comes from the iron-oxide formed on its surface during manufacturing. So it is different from galvanized pipe because black steel pipe is uncoated. The black pipe is manufactured without a seam, which causing it is better pipe to carry gas. So the primary purpose of black steel pipe is to carry propane or natural gas into residential homes and commercial buildings. In addition, the black pipe is more fire-resistant than galvanized pipe, so it is also used for fire sprinkler systems. 　　On the one hand, there are some disadv...

　　The production process of precision welded pipe has a little difference with the different production method, but the formation of welding part of the production process is basically the same, the difference only in the subsequent process. Typical production process is as follows: 　　1. The first production mode production process of precision welded pipe: 　　Strip preparation → open → flat → cut head → butt welding → live storage → forming → welding → remove the burr → weld heat treatment → cooling → sizing → nondestructive testing → Flying shear cut → straighten → cut flat head → eddy current testing / water pressure test → inspection packaging → finished 　　2. The second production mode production process precision welded tube: 　　Steel preparation → open roll → straightening → cutting head → butt welding → loose storage material → forming → welding → cleaning burr → weld heat treatment → cooling → sizing → nondestructive testing → flying shear cut off → preparation (drawing) ...