steel tube

　　 LSAW steel pipe after heat treatment is a new technology to eliminate residual stress. After the material is preheated before welding to heat treatment temperature and the butt welding process to maintain the temperature of the continuously heated member, after the welding is completed using its thermal insulation cotton allowed to cool slowly. This method can effectively reduce the welding residual stress and improve resistance to stress corrosion of metals. 　　Internal weld NDT since the large steel pipes in water supply project belongs, especially the thickness t = 30mm steel is used as a pipe bridge, both to withstand water pressure inside, but also the burden of its own weight and the water formed by a steel pipe moment, so the welding quality requirements are particularly high. For pipe bridge with a thickness t = 30mm large-diameter pipe, the longitudinal seam and girth weld belong to a class, require 100% of X-ray film examination and 100% ultrasonic flaw detection; and th...

　　The galvanized steel pipe production lines have special requirements, especially for the production environment, it is nesscary to production quality and efficiency improvement. Particularly, galvanized steel need a stable enviroment to production. 　　First, Ensure that the production line for delicate work processes, equipment, heating, ventilation, drainage, etc., all work are revolves around the ritual of quality. As long as the quality of the galvanized steel is good, all other factors can be achieved. 　　The use of galvanized steel is very widespread, especially in natural gas pipes, heating and other high strength and quality of the pipeline industry, galvanized steel pipe has a obvious advantages than others. If the galvanized used as plumbing, a large amount of rust inner tube after several years of use, the outflow yellow water pollution not only to ware but also mixed with not smooth inner wall of the breeding of bacteria. And corrosion leads to high heavy metal content ...

　　TP347H high-pressure boiler heat-resistant stainless steel seamless steel pipe round billet is the main material used to manufacture heat exchanger tubes, reheater tubes, steam pipes and petrochemical heat exchange tubes for large generator sets. The application environment is high temperature and high pressure, and the use environment is relatively harsh. This requires good high temperature structure stability, long-lasting performance, high temperature corrosion resistance, and good thermal processing, cold working, welding and bending. Processing performance. 　　TP347H trial chemical composition (mass fraction, %): 0.04 ~ 0.1C, ≤ 2.0Mn, ≤ 0.75Si, ≤ 0.03P, ≤ 0.01S, 9.0 ~ 12.0Ni, 17.0 ~ 19.0Cr, 8 × w (C) ~ 1.0% w (Nb). The production process is as follows: batching→EAF electric arc furnace initial refining→AOD furnace refining→die casting→finishing→heating→forging→straightening→finishing→inspection→packaging→into the warehouse. 　　The TP347H round billet was developed by using th...

　　20G and 12Cr1MoVG are representative of high-quality carbon steel and alloy steel for boilers, and have been widely used and developed in practice. 12Cr1MoVG is a low-alloy pearlitic heat-strength steel that has been developed earlier and has a relatively mature application. It has low carbon content, good processability and thermal conductivity, and has high durability and long-lasting plasticity. It is generally used in the manufacture of headers, steam pipes with steam temperatures below 540 °C, superheaters, reheaters and some castings and forgings with a metal wall temperature not exceeding 580 °C. It is the most common main steam used in high-parameter thermal power plants. One of the steels for pipes and reheater pipes. With the sharp increase of the operating parameters and single-unit capacity of power station units in China and the need for the development of high-temperature boiler pipes to large diameters, further research on high-temperature and high-strength boiler tube...

　　The production process of seamless steel pipe is mainly accomplished by tension reduction. The tension reduction process is a continuous rolling process of hollow base metal without core rod. In the production rolling process, sometimes the steel pipe is not straight, and what method can correct the tortuosity of the seamless steel pipe? 　　The seamless steel pipe is a circular, square, rectangular steel with a hollow section and no seams around it. The seamless steel pipe is formed by perforating a steel ingot or a solid tube blank, and then hot rolled, cold rolled or cold drawn. The seamless steel pipe has a hollow section and is used as a pipe for conveying fluid. Compared with a solid steel such as round steel, the steel pipe is light in weight when it has the same bending and torsional strength, and is an economical section steel, which is widely used in manufacturing structures. Parts and mechanical parts, such as oil drill pipes, automotive drive shafts, bicycle frames, and ...

　　Iron ore is mainly used in the steel industry. There are many kinds of iron minerals, and about 300 kinds of iron minerals and iron-containing minerals have been discovered, among which more than 170 are common. However, under the current technical conditions, the main industrial value is magnetite, hematite, maghemite, ilmenite, limonite and siderite. 　　Classification of magnetite 　　The chemical formula of magnetite is Fe3O4, and the theoretical iron content is 72.4%. This ore sometimes contains a composite ore of TiO2 and V2O5, which is called titanomagnetite or strontium titanomagnetite. 　　It is rarely encountered in natural pure magnetite ore, and some of the magnetite is often oxidized into semi-artificial hematite and imaginary hematite due to surface oxidation. The so-called imaginary hematite is the oxidation of magnetite (Fe3O4) to hematite (Fe2O3), but it still retains the shape of the original magnetite, so it is called imaginary hematite. 　　Magnetite has strong ma...

　　Blind flange, its function is to cut the medium in the pipe, according to the use of pressure and the form of the flange sealing surface can be divided into the following: 　　Smooth surface blind flange, used with smooth sealing surface flange, its applicable pressure range is 1.0 ~ 2.5MPa. 　　The convex blind flange has a convex surface on one side and a concave surface on the other side, and is used together with the concave and convex sealing surface flange. The pressure is 4.0 MPa and the specification range is DN25 to 400 mm. 　　The trapezoidal groove surface blind flange is used in combination with the trapezoidal groove sealing surface flange, and the pressure range is 6.4 to 16.0 MPa. Specifications range from DN25 to 300mm. 　　The "8" word blind flange is also divided into three types: smooth surface, concave surface and trapezoidal groove surface. The pressure is the same as the above three blind flanges. The difference of the "8" word blind flange ...

　　The material used for the anticorrosion treatment of the spiral tube plays a decisive role in the quality of the anticorrosive steel pipe . Raw materials must be rigorously tested for anti-corrosion treatment. The anti-corrosion materials required for different anti-corrosion treatments are different. 　　Epoxy coal tar asphalt anticorrosion is mainly applied to asphalt anticorrosive coatings and polypropylene non-woven fabrics. The main raw materials for PE anticorrosive steel pipes are polyethylene and polypropylene. 　　Cold tape refers to the tape used for anti-corrosion wrapping. Cold tape generally includes polyethylene (composite) anti-corrosion tape, polypropylene reinforced fiber anti-corrosion tape, aluminum foil anti-UV anti-corrosion tape, polyethylene 660 (modified asphalt) tape, double-sided tape Anti-corrosion tape (this tape is rarely used in China, but it is very practical, widely used abroad, generally used for export) and epoxy coal asphalt anti-corrosion tape. The...

　　1, Seamless pipes don’t have a weld seam. Traditionally, the seam of welded pipes has been viewed as a weak spot, vulnerable to failure and corrosion. However, improvements in the manufacturing process for welded pipes have increased the strength and performance of the weld seam. Still seamless pipes prevent any possibility of a weak seam. In general, welded steel pipes can withhold 20% less working pressure than seamless ones. 　　2, Seamless pipes has higher working pressures compared to welded pipes of the same material and size due to having no welded seam. 　　3, Seamless pipes offers superior corrosion resistance because it has little potential for impurities, defects and differences in malleability that may be associated with the welded area in welded pipe. 　　4, Seamless pipes do not require testing for weld integrity. This is a must for welded pipes. 　　5, Seamless pipes harden as they are manufactured, so heat treatment after manufacturing is not required. Most welded pip...

　　Cleaning the inside of the steel pipe 　　Run after through the inside of the pipe. This can be done in a sink if the pipes is small enough. Use a water hose outside if the pipe is too big to fit in the sink. Tilt and twist the pipe. While the water is running, tilt it so the water run against the inside of the pipe. Twist the pipe so the water cleans off the sides of the pope, use a scrub brush saturated with soapy water to scrub the inside of the pope. If the pipe is too narrow to fit your hand though, use a baby bottle brush to clean the inside, Rinse the pipe with clean water and allow to dry. 　　Cleaning the outside of the steel pipe 　　Saturate a soft cloth with distilled white vinegar and wipe the outside of the pipe with the cloth. Rinse the outside of the pipe with warm soapy water. Soak paper towels in baby oil and clean the outside of the pipe with them. The baby oil will make the pipe shine like new. Spray a water displacing formula onto a cloth and wipe the pipe down. ...

　　 Seamless steel pipes are widely used in our lives and are also suitable for all major factories, so the specifications and specifications are very high, especially the outer diameter of seamless steel pipes, which is small today. Let me introduce you to the factors that affect the accuracy of the outer diameter of seamless steel tubes. 　　1. Always slag. First, raise the temperature to the upper limit of the process temperature so that the zinc slag is separated from the zinc liquid, so that the zinc slag sinks to the bottom of the tank and is taken up by a zinc spoon or a special slag machine. The plated parts falling into the zinc liquid should be salvaged in time. 　　2. To prevent the iron in the plating agent from being brought into the zinc tank with the workpiece, the plating agent should be processed in the online regeneration cycle, and the ferrous content should be strictly controlled. It is not allowed to be higher than 4g/l, and the PH value is always maintained at 4.5...

　　The corrosion resistance of stainless steel tubes depends on the chromium. When the amount of chromium added is 10.5%, the atmospheric corrosion resistance of the steel pipe is remarkably increased, but when the chromium content is higher, although the corrosion resistance is still improved, it is not obvious. The reason is that when chromium is used to alloy steel, the type of surface oxide is changed to a surface oxide similar to that formed on pure chromium metal. This tightly adhering chromium-rich oxide protects the surface from further oxidation. This oxide layer is extremely thin, through which you can see the natural luster of the steel surface, giving the stainless steel a unique surface. Moreover, if the surface layer is damaged, the exposed steel surface will react with the atmosphere to repair itself, and the "passivation film" is reformed to continue the protection. 　　Therefore, all stainless steel pipes have a common characteristic, that is, the chromium con...

　　High-frequency resistance welded steel pipe( erw steel pipe ) has the following characteristics: 　　(1) High-frequency resistance welding filler metal is a no pressure welding. 　　(2) High-frequency resistance welding high welding speed, high production efficiency. Since the current high concentration of energy in the weld zone, fast heating, and thus high welding speed. For example, China has introduced 426 units, the maximum welding speed 45m / min, the minimum welding speed 15m / min. 　　(3) The weld heat affected zone. Due to the highly concentrated energy welding, heating speed, high welding speed, the workpiece strong self-cooling effect, so the heat affected zone. 　　(4) High welding production technology and management level requirements. High-frequency welding is resistance welding in a continuous production line, the welding speed, high production efficiency, factors affecting the welding process and more, you must have a high level of technology and management level, i...

　　Pipe surface roughness is the machining surface having a smaller pitch and the tiny valley irregularities. The distance between two peaks or two troughs (the pitch) is small (less than 1mm), it is difficult to distinguish with the naked eye, so it belongs to the microstructure geometry errors. Surface roughness is, the more smooth the surface. The surface roughness of size, have a great impact on the performance of mechanical parts. 　　Pipe surface roughness mainly in the following aspects: 　　1) Pipe surface roughness of the parts wear resistance. The rougher the surface, the smaller the effective contact area between the mating surfaces, the greater the pressure, the faster the wear. 　　2) Pipe surface roughness of stability of the complex nature. For clearance fit, the rougher the surface, the more easy to wear, so that the gap increases during operation; interference fit, because the assembly will squeeze microscopic convex peak level, reducing the actual effective interferenc...

　　Black steel pipe and galvanized steel pipe are the two most common kind of pipe applied to transport liquid and gas. They have several respects similar to each other and many people confuse one to the other one. What is the main difference between black steel pipe and galvanized steel pipe? Black steel pipe and galvanized pipe are made of steel, but galvanized pipe has a zinc coating while black pipe does not and therefore, galvanized pipe is more expensive and more durable. For transportation, black steel pipe tend to erode more easily than galvanized pipe and on account of this, it is more suitable for transporting gas and galvanized pipe is fit for carrying water instead of gas. 　　Galvanized pipe covered with a layer of zinc which makes it have higher ability of corrosion protection and help to prevent the accumulation of mineral deposits that will block the pipe. Galvanized pipe is mainly used for carrying water to supply home and commercial buildings; it is also serve as scaf...

　　How to bond the thermal expansion seamless steel pipe : 　　1. Thermal expansion pipe before bonding, dry cloth and the outer side of the socket socket wipe process, when the sticky surface oil to be wiped clean with acetone. 　　2. Thermal expansion pipe section should be flat, perpendicular to the tube axis and chamfered; inserted before bonding should be drawn markings and insert test, the test can only be inserted into the depth of the original depth of 1/3 ~ 1 / 2, prohibited the use of over-the gap is greater than the bonding method. 　　3. Apply adhesive should be applied inside of the socket, smear the outside of the socket, the socket should be applied along the axial direction from the inside out evenly amount, shall not apply or drain excess coating (200g / m2). 　　4. After the adhesive applied, the external force should be applied within 1 minute to keep the same, straight and position connectors are properly maintained. 　　5. After bonding is completed in a timely man...

　　At times, it can seem as though a project is becoming overwhelming. With all of the important things going on in life it can seem impossible to devote a large amount of time to one particular task. Keeping yourself and your team organized is the first step to creating more success and less stress during any type of steel casing project. Without some kind of organized plan, your project can turn into an unorganized mess rather quickly. Here are a few helpful ways that organization can assist in producing the exact outcome you were hoping for in your next steel casing pipe project. 　　Manage Your Time Wisely 　　It’s understandable, as humans we can become distracted and lose track of time. However, when it comes to working on a project, time is crucial. In most cases, there is some type of deadline to your work. Having a planned out schedule of your tasks will help you keep track of how much time needs to be devoted to each one. That way, when the end is in sight you won’t be rushin...

　　To control the welding quality of galvanized steel pipe, The factor of one person is the control focus. Therefore, before the welding, the skilled welder with the welder's certificate should be selected to carry out the necessary technical training. It is not allowed to be replaced at will, to ensure that the pipe welder is relatively stable. 　　Welder: The welder must ensure reliable performance and meet the needs of the process; the welder must have a qualified current and voltmeter to ensure the correct implementation of the welding process. The welding cable should not be too long, and the welding parameters should be adjusted when it is long. 　　Welding environment control: Ensure that the temperature, humidity and wind speed during welding are in accordance with the process requirements. 　　 http://www.xysteelpipe.com/info/How-to-control-the-welding-quality-of-galvanized-steel-pipe-1446-1.htm