ERW Steel Pipe

　　The causes of large diameter spiral pipe wrong side: large diameter spiral steel pipe production, the wrong side have occurred with many of its factors. In the production practice, often the wrong side of the ultra-poor leaving dry pipe downgrade. Therefore analyze the causes and prevention of large diameter spiral pipe produced the wrong side is necessary. 　　1, the strip camber is caused by the wrong side of the main factors pipe. In forming the spiral welded pipe, steel strip camber angle will constantly change shape, leading to changes in the weld gap, resulting in open seams, wrong side or even take sides. Seriously affecting the quality of steel, so the observation camber steel strip coil-after by controlling the vertical roll can be cut to make the disc as well as the continuous removal of part of camber angle control and corrective shaping is to reduce the camber of the strip in the production process effective way to produce the wrong side. 　　2, due to the poor without t...

　　In the production process of cold-drawn seamless tubes, there are cold work hardening and hydrogen embrittlement phenomena, which are the main reasons for the cracking of the seamless tube. This article analyzed two phenomena and put forward some measures to prevent cracking of small-diameter seamless steel tubes. 　　Burst phenomenon analysis cold-drawn seamless pipe is formed by reducing the diameter of the seamless steel pipe through a drawing die, and the process route is generally annealing, pickling, and drawing. In the process of drawing cold-drawn small-diameter seamless steel tubes, cracks may begin to crack as much as the bamboo ridges from head to tail. We call this phenomenon collectively cracking. 　　The reasons for the cracking are: 　　(1) Work hardening; 　　The influence of work hardening on the steel pipe during cold drawing produces a large number of plastic deformations, causing significant lattice distortions, thereby increasing the lattice energy and increasing...

　　When testing the hardness of steel, the mechanical properties of steel should be taken into account, which is related to the quality and performance after deformation, stamping and cutting.Thus, all seamless steel pipes need mechanical property test, the test has two types: tensile test and hardness test. 　　Tensile test is use a seamless steel pipe sample, and then pull the sample on the machine till it’s broken, therefore can test its tensile strength, yield strength, and elongation. The tensile test is the most common method to test the mechanical property of metal material. As long as the mechanical property is required, all metal material need to have tensile test. Particularly for those metal materials have complicated shapes that are not easy to be tested, the tensile test is the only way to test its mechanical property. 　　Hardness test is use a indenter and pressed it into the surface of sample pipes slowly, then measure the depth or dimension of the indentation so that ca...

　　Galvanized steel pipe is a steel pipe that has been coated with zinc. This coating protects the steel from corrosion. It is most commonly used for outdoor construction like fences and handrails, or for some interior plumbing. The zinc provides a barrier against corrosion so that the pipe may be exposed to the outdoor environmental elements. The protective barrier proves equally effective against damage from indoor humidity. 　　Galvanized steel can be made into a strong plumbing or tubing material — one that resists corrosion from exposure to water or the elements. It has been used used for water-supply pipes or as a strong tubing for outdoor applications. 　　 Galvanized steel hardness 　　Galvanized Steel are those steel that has been covered with a layer of zinc metal. Galvanized steel in terms of hardness test is a Brinell hardness, Rockwell hardness, Vickers hardness, Shore hardness, micro-hardness and high-temperature hardness, etc., which can be divided into a variety, most of...

　　cperforation tools are as follows: 　　1) roller: it is the main transmission deformation tool. Usually, the roller consists of an inlet cone, a rolling belt (also called a compression belt) and an outlet cone. Its function: 　　One. Injection cone: enter the tube blank and realize the perforation of the tube. 　　The outlet cone of the bay is designed to reduce the hair wall, smooth the surface of the capillary, uniform the thickness of the capillary wall and complete the capillary backflow. 　　C. Rolling belt: transition from inlet cone to outlet cone. 　　2) guide rail: it is a fixed external deformation tool, which not only plays the guiding role of the tube and capillary, makes the rolling line stable, but also is more important to close the hole and outer ring, restrict the transverse deformation and tube diameter of the capillary, and play the role of controlling the diameter of the capillary diameter. The guide plate has the same shape as the roller, and has an inlet part, a...

　　Spiral pipe stacked right help protect the quality of spiral steel pipe , spiral steel pipe prolong life, prevent deformation, erosion, so orderly stacking spiral steel pipe, but also conducive to late spiral pipe loading, inventory. Spiral Pipe buyers should also strictly in accordance with the requirements of spiral steel pipe pile. 　　1) Spiral pipe open dumps, following necessary pad with wood or stone, stack surface needs slightly tilted to facilitate drainage, and pay attention to the material placed flat to prevent the causing bending. 　　2) Spiral pipe principle requires stacking under palletizing firm to ensure the safety of the premise, to do according to species, palletizing specifications, different varieties of materials to palletizing respectively, to prevent muddy and mutual erosion, but also easy to install a library car. 　　3) Prohibit storage of steel aggressive action items in spiral steel pipe pile position around. 　　4) Spiral steel pipe pile bottom should be...

　　In the long-distance pipeline construction, pipe-line account for a large proportion, generally 35% to 40% of line pipe accounts for investment projects total investment. How to choose a reasonable price, excellent performance pipe is particularly important to a reasonable choice of pipe to save construction investment, easy construction and safe operation of the pipeline system has a very important influence. 　　Gas Pipelines straight seam steel high-frequency electric resistance welded steel pipe, spiral submerged arc welded pipe, LSAW steel pipe . Limited frequency straight seam electric resistance welded steel pipe diameter range is generally limited to domestic steel Φ406.4 mm or less, the largest in Japan has reached a diameter Φ508mm. For large diameter pipe in the form of a spiral SAW, LSAW two kinds. Spiral welded steel pipe because the pipe forming process and characteristics of many shortcomings, the proportion is gradually declining in the long-distance pipeline. 　　In ...

　　Seamless steel pipe are mainly produced by hot-rolled steel pipes. In addition to hot rolling, there are still cold-rolled or cold-drawn hot-rolled piers to produce small-size seamless steel pipes. The proportion of seamless steel pipes in steel pipes has stabilized at 42 in recent years. %-45%, the welded pipe has a rising trend. Seamless steel tubes and welded steel tubes are more reliable and adaptable to the materials, especially for the production of thick-walled and alloy steels. The main problems are high investment, high costs, complex manufacturing processes, and large wall thickness and ovality tolerances. The welded pipe is actually a deep-processed plate product. Its cost and price mainly depend on the cost and price of the plate. Under the condition of similar prices, the market competitiveness of the seamless steel pipe is improved due to its strong reliability, with the quality of the steel plate. The continuous improvement and the improvement of the technical level of...

　　It is important to understand the quality of the product you are going to buy, and here we will introduce some simple SA 213 boiler tube quality identification methods. 　　First, low quality SA 213 boiler tube prone to fold. Folding is a variety of polylines formed by the surface of the SA 213 boiler tube, which often runs through the longitudinal direction of the entire product. The reason for the folding is due to the high efficiency of the poor manufacturers, the amount of pressure is too large, resulting in the ear, the next rolling to produce folding, folding products will crack after bending, SA 213 boiler tube strength decreased. 　　Second, poor quality SA 213 boiler tube surface prone to scarring. There are two reasons: 　　1. Poor SA 213 boiler tube material is not uniform, more impurities. 　　2. Poor quality manufacturers guide guide equipment simple, easy to sticky steel, these impurities are easy to produce scar after the bite roll. 　　Third, poor quality SA 213 boile...

　　The square steel pipe is a term for square pipes which have the equal side length and rectangular pipes which have the unequal side length. The square steel pipe is made by the strip steel with the rolling process. Generally, the strip steel will be unpacked, flattened, curled and welded to be a round pipe, be rolled into a square pipe, and will be cut into the needed length. Square steel pipes are mainly used in fields including the mechanical industry, the chemical industry, shipbuilding, oil casings and pipelines for transporting water, gas, sewage, etc. 　　The classification of square steel pipes according to materials 　　According to materials, the square steel pipe can be divided into the common carbon steel square pipe and the low alloy square steel pipe. 　　The classification of square steel pipes according to production processes 　　According to production processes, square steel pipes can be classified into the hot rolled seamless square pipe, the cold drawn seamless s...

　　The 3PE Epoxy coated steel pipe is with 3 layer coatings, first FBE coating, middle is adhesive layer, outside polyethylene layer. 3PE coating pipe is another new product developed on the FBE coating basis since 1980s, which contains adhesives and PE(polyethylene) layers. 　　3PE can strengthen the pipeline’s mechanical properties, high electrical resistance, waterproof, wearable, anti-aging. It could protect pipe from the heat loss which only account for 1/4 of pipe. Let’s see why 3PE coated pipe is more advantage than FBE coated pipe. 　 　Durable lifetime 　　3PE epoxy coated steel pipe have good stability and anti-aging performances under the normal work temperature and pressure conditions, consequently its lifetime can prolong above 50 years. 　 　Corrosion resistance 　　Due to PE elements structure stability is very high, it is resistant to corrosion of natural gas, liquefied petroleum gas, artificial gas and other chemical subjects, no need secondary anti-corrosion equipment....

　　Processing techniques of large-caliber lsaw steel pipe : 　　① Thread processing steel wire head Wuxi large diameter pipe, tooth shape, pitch and so it is necessary to link up with the sleeve-shaped teeth, pitch together, and by supporting the gauge view qualified. 　　② When processing steel thread should be used in water-soluble cutting fluid lubrication; when the temperature is below 0 ℃, should be incorporated into the 15% -20% of large diameter pipe Wuxi sodium nitrite, do not use oil lubrication fluid or without lubricating fluid threading. 　　③ Each operator should view the appearance of quality steel wire head and make the operator symbol. 　　④ Self-qualified by the head of steel wire, each standard response processing capacity of large diameter pipe, Jiangsu random sampling of 10%, and not less than 10, if a failure that the batch processing of the full view, he failed wire head should be re-processed after passing through the inspection can use it again. 　　⑤ Silk has be...

　　 SSAW steel pipe in the production process, we need to pay attention to a series of matters. Except for the following test items, according to the API standard and other relevant standards and the special requirements of some users, but also the need for steel, steel pipe and other tests Destructive tests, including physical and chemical properties of the raw materials into the plant sampling, visual inspection of 100% steel . 　　A. Oiled marking: steel after passing were oiled to prevent corrosion, and according to user requirements for marking. 　　B. Leveling Milling: The flat steel anvil machine so that the original curl, and then through the edge milling machine for two-sided steel milling, so as to meet the requirements of the plate width, plate edge parallelism and groove shape. 　　C. Shear molding: the steel plate production line along the outer edge of the spiral curl into a tube. 　　D. Butt cut: double-sided submerged arc welding using advanced technology to pre-welding...

　　Large diameter lsaw steel pipe hydrostatic testing machine during the pressure test, the first sealing means by the end of the test straight seam steel pipe sealed at both ends and low-pressure water injection in the exhaust pipe filling process air through the exhaust valve, in after the water is full of low-pressure, high-pressure water injection device through the booster is to pressurize the inner tube until the required test pressure. After reaching a predetermined test pressure predetermined dwell time, if the straight seam steel pipe leak, deformation phenomena in the pressure test is carried out relief. Then open the end seals, low-pressure water discharge, straight seam steel pipe to be tested to check for visual inspection station for suspicious penetration. According to the standard pressure for pressure testing process curve automatic recording device for recording. 　　Pressure steps: 　　1. The hydrostatic pressure test pressure Longitudinal working pressure and test p...

　　Domestic high-precision seamless steel pipe generally by increasing the metal alloy in a way to improve the performance of the material, seamless steel pipe after the cold drawing are required to stress annealing, to eliminate the residual stress of the material, improve the organization of materials, improve material plastic, so as to achieve the purpose of preventing the occurrence of fracture failure of seamless steel pipe. 　　At present, China's stainless steel seamless steel tube are made of ordinary 45 # or 20 # steel 27SiMn steel, cold drawn by the deformation of the metal strength is improved; however, it is at the expense of metal plasticity and toughness for the price. Precision cold drawn seamless steel tubes is its high dimensional accuracy and high strength properties and based on the market, it must ensure that the amount of deformation within a certain range, in order to maximize the performance of the material, reducing the material Negative Effects. 　　Seamles...