ERW Steel Pipe

　　There is a steel tubular scaffolding type named the single typed tubular scaffolding, which uses only one type of scaffolding tubes of Ф48×3.5mm. Different kinds of scaffolding shall be used in the same different type of construction projects and formwork projects. Thecuplock scaffolding are most widely used in the bridging construction projects. So does the frame scaffoldings. When constructing the main body of the buildings, the coupler scaffoldings are more often used. The transverse space between the standing tubes is usually 0.9-1.5m and the longitudinal space is 1.2-1.8m. For sure, there are also other scaffolding kinds. PRIME STEEL PIPE scaffolding products fully comply with Euro HD1004 standards and also the most up to date international standard. ISO 9002 are also certified in our company. When choosing the scaffolding, the predominant factor is the diameter element. This is delicately designed to meet special construction requirement in the construction projects. 　　PRIME ...

　　When building the scaffolding frames, the ground shall be leveled and solid and the bottom of the standing tubes shall be backed with a thick scaffolding plank about 50mm in depth. There shall be a 50mm thick scaffolding for sale plank or 15 mm plywood on the floor. 　　a The scaffolding tubes and accessories shall be checked and inspected rigorously before the real start of the erection, and it is forbidden to use any disqualified tubes and accessories. 　　b Lay down the lines, plank the scaffolding boards, and set the base plates or standing tubes locations according to the design of the construction details. 　　c The outside ring of the scaffolding shall be built from one corner to the other two side in the shape of a circle. One letter shaped scaffolding shall be erected and extended from one end to the other end. 　　d The fixation order of the tubes shall be from the longitudinal tubes, the transverse tubes to the standing tubes. And then set the longitudinal and transverse ...

　　First, reasonable selection. Straight pipe joints should choose a good micro deformable material straight seam steel pipe steel, for carbide segregation serious straight seam steel casting steel should be reasonable and transfer of heat treatment, larger and unable to cast a straight seam steel pipe steel may be solution bis refined heat treatment. Reasonable choice of heating temperature control heating rate, on a straight seam steel pipe can be heated slowly, preheat and other ways to reduce heating balanced straight seam steel pipe heat deformation. 　　Second, the correct heat treatment process operation and reasonable heat treatment process is also a useful way to reduce the distortion of straight pipe joints. Straight seam steel pipe deformation reason is often messy, but we only need to master the rules of the deformation analysis of the onset of the reason, the choice of avoiding abnormal deformation method of straight pipe joints can be reduced, and also can be controlled. ...

　　Single-sided welding double-sided forming is to weld on one side, and the other side of the weld can also be formed well. It is often used in the welding of pipes, and the inside can no longer be welded. The single-sided welding has double-sided forming with continuous arc welding and arc welding. The single-sided welding double-sided forming operation technology is a kind of operation method which can be obtained by using a common welding rod and a special operation method on the front side of the groove and ensuring the front and back sides of the groove after welding. 　　Generally, a good welder can make double-sided molding, but the technique of double-sided molding is not easy to master, and requires considerable experience and comprehension ability, so the single-sided welding double-sided forming technology is rarely used unless it is forced to They are replaced by argon arc welding. Single-sided welding of the double-sided forming root-welding layer is not only prone to slag...

　　Precision steel tubes is a kind of seamless steel pipe . Precision tubes features: 　　1. The cold-rolled precision steel tolerances and high precision, product precision control 5mm, outer wall finish, the surface oxide layer. 　　2. The cold-rolled precision steel comprehensive performance excellent, able to withstand high pressure, cold bending, flaring, flattening no crack, no wrinkled skin, can do a variety of complex deformation and mechanical processing. 　　3. The promotion and application of precision seamless steel can save and improve processing effectiveness, reduce the manufacturing processes and equipment investment, can save costs and greatly reduce machining time, improve production and material utilization, and help to improve product quality, reduce cost. 　　Precision tubes uses: precision cold-rolled steel is widely used in automobiles, motorcycles, electric cars, petrochemical, power, shipbuilding, aerospace, areas of bearings, pneumatic components, the low-press...

　　Lamination defect control measures of spiral steel pipe is following below: 　　1, to improve the toughness of plastic tube 　　Improve the cleanliness of molten steel, to reduce the harmful inclusions; increase the proportion of the slab crystal axis, to reduce the center segregation and center porosity; the use of reasonable cooling system to avoid cracks occur within the slab; billet or rolling slab to be taken offline slow cooling process, reduce internal stress, thus ensuring the microstructure and mechanical properties of the finished tube and pipe meet the technical standards. 　　2, the reasonable control of the heating temperature 　　By measuring the thermoplastic curve, choose the best heating temperature. Note also that there is enough heating tube holding time, in order to reduce and improve plastic deformation resistance and toughness. 　　3, lower roll speed 　　Roll speed is a key parameter piercing process, the roll speed from low to high variations in the process, ...

　　Fasteners are general term for mechanical parts used for fixing two or more parts. It usually includes: Bolts, studs, screws, nuts, tapping screws, gaskets, which almost made by carbon steel and alloy steel . Surface treatment is necessary for certain parts. The coating must be firm and installed without shedding. For screw thread fasteners, the coating must be thin enough that the thread can still be screwed after plating. Generally, the temperature limit of coating is lower than that of fasteners, so the operating temperature requirements should also be considered. Therefore, the following issues should be considered in surface treatment: material, appearance, service temperature, installation torque-preload consistency. Some commonly used coatings for fasteners are briefly described below for reference. 　 　Electric galvanized 　　Electroplating is the most commonly used coating for commercial fasteners due to its low cost and good appearance. Zinc coating is relatively cheap and...

　　The hardness test of seamless steel pipe can be divided into two methods, one is tensile test and the other is hardness test. The following small series is introduced in detail for everyone: 　　The seamless steel pipe produced by the tensile test, the tensile tester of the sample will be pulled to the fracture, and the other measurement, usually only the mechanical properties of the tensile strength or more, the yield strength, the elongation and the reduction of the area . Tensile test is a test method for metal materials, almost all metal materials, as long as needed. Mechanical properties provide basic mechanical properties for tensile testing. In particular, those that are not easy to form a material hardness test, tensile test, as the only means of mechanical performance testing. 　　The hardness test is a rigid indenter hardness tester that is slowly pressed into the surface of the sample, and then the indentation depth or size is tested to determine the hardness of the mater...

　　AC electromagnetic coil eddy current testing to the surface of the metal member induced eddy current NDT techniques. It is suitable for conductive materials, including defects in ferromagnetic and non-ferromagnetic metallic material component testing. Since the eddy current testing is not required in the detection coil in close contact with the member, it does not full coupling agent between the coil and the member, easy to implement test automation. But only for eddy current testing of conductive material, it can only detect defects surface or near surface layer, inconvenient to use in the shape of complex components. 　　When the alternating current through the coil principle, if the voltage and frequency of the use of the same, the current through the coil will also be unchanged. If placed in a metal tube coils, thick-walled spiral pipe circumferential surface induced current, that vortex. Magnetization direction opposite the direction of the applied magnetic field eddy current, ...

　　1. Thick-walled spiral pipe forming process, the steel deformation even small residual stress, surface does not produce scratches. Processing of steel in the diameter and wall thickness of pipe sizes range, greater flexibility, especially in the production of high-grade steel thick-walled pipe, particularly large diameter thick-walled tube aspect has the incomparable advantage of other processes to meet more user requirements in terms of pipe specifications; 　　2. The use of internal and external welding (fine welding) process after the first pre-welding, can be implemented in the best position welding, less prone to the wrong side, partial and incomplete penetration welding defects, easy to control weld quality; 　　3. Overall mechanical expanding can effectively improve the dimensional accuracy of steel, and to improve the distribution of internal stress of the steel pipe, so as to avoid damage due to stress caused by corrosion, it is also conducive to the construction site weldi...