steel pipe

　　We use a rigorous quality monitoring system to inspect raw materials and test each product during the production process to ensure that each tube meets the standard requirements and is fully qualified at the factory. 　　Our quality control system mainly includes the following steps: 　　1. In order to ensure that the original and auxiliary materials used are qualified products, the company evaluates and selects qualified suppliers according to GB/T19001-2000-ISO9001:2000 and API standards. Inspected by the raw material inspector of the Quality Management Department, unqualified raw materials and accessories may not be put into use. 　　2. Casing pipe diameter test: This test is used to detect the straightness of the pipe body and detect whether there is a bump in the pipe wall. 　　3. Tubing collar size and appearance inspection: QC staff inspects the size and surface of the steel pipe to ensure compliance. 　　4, Quality inspection is for the finished product testing, quality inspe...

　　International requirements for the threads of casing pipe when a pair of inner and outer cones are fitted to each other, only the allowance of the end face is satisfied, and the axial displacement can be used to complete the interference at the connecting surface. And can be used to improve the processing quality of the connecting area, increase the axial force to add the touch area at the touch area and pressure, and then get more tight ring pressure touch area. The larger the area of the touch area, the less likely the leakage path is, and the more reliable the sealing function is. The thread of casing pipe is a special taper sealing method with thread groove - taper pipe thread seal. 　　When the tapered pipe thread meets, only the face allowance (close distance) is satisfied, and the preload in the sealing surface can be easily obtained by screwing the thread and causing the axial displacement. After reviewing the taper sealing method, when the inner and outer taper threads are m...

　　A106 and A53 the most commonly used carbon steel pipe types in industry today, and they’re very similar. But while the differences between A106 and A53 are few, they matter a great deal in terms of when and where each is specified. 　　To ensure you purchase the correct pipe, two things are a must: A basic understanding of seamless and welded seam pipe, and providing detailed specs. If you read the ASTM and ASME standards for A106 and A53 pipe, you’d quickly observe how similar they are in terms of chemical makeup and manufacture. The most important difference is that pipe meeting the A106 standard must be seamless while pipe meeting A53 can either be seamless or welded. 　　Welded seam pipe is made by curling a steel plate into a cylinder and then joining the edges via a weld. Seamless pipe is made by piercing cylindrical bars of steel through the middle while it’s hot, creating the same shape but without a seam. 　　The reason for the difference lies in the suitable applications fo...

　　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...

　　ERW is the first letter abbreviation for electric resistance welding. 　　ERW tube and submerged arc welding pipe significantly different, using a pressure-free filler metal welding, the weld is not filled with other ingredients, relying on high-frequency current skin effect and proximity effect, instantly heating the plate edge to welding temperature by squeezing rollers squeeze formed weld forging organizations. High-quality steel pipe welds require online or off-line heat treatment, welding zone structure refinement, quality ERW pipe welds and base metal can reach the same level of toughness, which is submerged arc welding process can not be achieved. 　　EFW namely electric fusion welding of the first letter abbreviation. 　　Submerged arc welding (SAW) - Electric welding (EFW) one, is through one or more consumable electrodes between the workpiece and the heating of the metal between the metal binding of a process, the arc and the metal filling material melted sufficiently, no p...

　　Hydrostatic pressure test is conducted using a method for static characteristics of rock deformation measurement indicators. 　　Hydrostatic pressure test is a test. When the pressure vessel is made, after the newly installed container 3 prior to use or access, in order to test the strength of the container macro (if there is a crack, if the deformation is too large) and sealing the sealing point and weld, adding an appropriate amount of water in the container. 　　 Determination of rock 　　Excavation in Rock a circular tunnel test, the test tunnel test section at one end portion is closed up concrete decking, using a high pressure water pump is forced into the test tunnel, so try cave rock surface subjected to a uniform water pressure caused rock deformation test changes again Underground radius or diameter, and then the relationship between pressure and deformation calculated deformation modulus and elastic resistance of rocks. 　　 Determination of pressure parts 　　Usually clos...

　　First,after hot rolling, steel internal non-metallic inclusions (mainly sulfides and oxides, and silicate) is pressed into thin slices, delamination (interlayer) phenomenon. Layering the steel in the thickness direction of the tensile performance deteriorated significantly, and there may be an interlayer tears during weld shrinkage. Weld shrinkage induced local strain reaches the yield point strain often several times larger than the load caused by the strain. 　　Second, the residual stress caused by uneven cooling. The residual stress in the absence of external force internal self-equilibrium stress, hot-rolled steel sections have such a variety of residual stress, the greater the general steel-sectional dimension, the greater the residual stress. Although the residual stress from equilibrium, but still has some influence on the properties of steel members under loads. Aspects such as deformation, stability, fatigue, etc. are likely to have an adverse effect. 　　 Check www.tjxyste...

　　Spiral pipe is a very widely used pipe, sometimes it may require welding, but spiral pipe exsit welding defects. 　　Under normal circumstances, weld defects of spiral pipe has porosity, undercut and crack phenomena. 　　Helical tube bubble defects: conducting spiral welded, in the center of the weld bead, there will be the situation of bubble defects, will produce this situation? Main reason is that, in the welding process is hydrogen bubbles form of residue inside the metal. How to solve this failure? 　　Welding process, we need to clear weld the inside of the oil, water and other ingredients, but also need good drying and removing moisture, so that hydrogen does not remain inside the weld . Increasing the welding current in the welding process and the generation of the bubble can be avoided yet. 　　Spiral undercut: v-shaped groove weld edge, and along the weld centerline, said undercut. Usually undercut is inappropriate because of the current, voltage and welding speed, therefor...

　　Requirement for API 5L X52 seamless pipes in standard 　　1. No cracks, folds, folds, peels, scabs and scales are allowed on the inner and outer surfaces of the steel pipe. These defects should be completely removed. The grinding of the surface defects should be smooth and smooth. The depth of the clearance shall not exceed the negative deviation of the nominal wall thickness. The actual thickness of the defect removal zone shall not be less than the minimum allowable wall thickness of the steel pipe. The method of welding shall not be used. 　　2. The straight path appearing on the inner and outer surfaces of the steel pipe must be ground. The depth of clearance must not exceed the negative deviation of the nominal wall thickness. The actual thickness of the defect removal area should not be less than the minimum wall thickness allowed by the steel pipe. 　　3. End shape: Both ends of the steel tube should be cut at right angles and the burrs removed. 　　4. Solder joint interface i...

　　We would take seamless steel pipe into list once we discuss the petroleum’s exploit. How’s the price now for seamless steel pipe? Today, supplier would have an introduction for this question. 　　First of all, in order to prevent soil erosion, seamless steel pipe for petroleum transportation underground should be coated with anti-corrosion paint or tar, asphalt and other anti-corrosion coatings, or covered with asphalt impregnated glass cloth and linen.Under this situation, you need to add the price for this. 　　What's more, all seamless steel pipes should be clean before using. and some steel pipe need to clean regularly. So we should take this cost into consideration too. On the pipelines that transport oil and natural gas over long distances, the dirt accumulated in the steel pipes must be removed regularly by a sweeper. For this purpose, dedicated devices for sending and receiving sweepers should be installed. 　　 http://www.xysteelpipe.com/info/How-is-the-price-of-petroleu...

　　Seamless steel pipe products and specifications are very numerous, and their performance requirements are various. All of these should be distinguished according to user requirements or changes in working conditions. In general, SMLS pipe products should be based on cross section shape, production method, material quality, connection mode, plating characteristics and classification. 　　The cross-section shape of SMLS pipe can be divided into round steel pipe and special-shaped steel tube. 　　The special-shaped steel pipe is a kind of steel pipe with various non circular sections. There are: square tube, square tube, elliptical tube, flat tube, semicircle tube, six corner tube, six corner tube, one side six corner tube, equilateral triangle tube, five corner flower tube, octagonal tube, convex tube, double convex tube. Double tube, multi concave tube, melon tube, flat tube, diamond tube, star tube, parallel quadrilateral tube, ribbed tube, drip tube, inner fin tube, stranded tube, t...

    ERW steel pipe is fed into the molding machine, deformed into a cylindrical tube through an induction loop or contact welding angle, the magnetic field around the induction coil current is induced by the edge of the strip, the strip edge due to its resistance generated thermal resistance is heated, the heated extruded strip edge forming roll extrusion welds. High-frequency welding metal is not added, it is actually a forge welding. If production control is better, does not remain fused surface of molten metal or oxide. HAZ shaped like a drum, because the edges of the strip into the strip entering the high-frequency current to generate heat from the end and side portions of the strip edges. HAZ color slightly darker than the base metal because welding carbon steel strip edge heating to diffusion, cooling weld carbon is absorbed in the strip edges.     Common defects of erw steel pipe welding     High frequency pipe may be a variety of welding defect...

    What is the difference between black pipe and galvanized pipe?     1. Different coating.     Black pipe is made of steel as is galvanized pipe. The difference is that galvanized pipe is coated with zinc, while black pipe is not.     2. Different Corrosion resistance     The black pipe is a light coating and provides only the barest protection. Black pipe will rust outdoors. The galvanized pipe will barely rust at all.     3. Different costs.     Black pipe is cheaper than galvanized pipe because of the zinc that is added to galvanized pipe.     4. Different application     Black pipe is best used for gas lines, not for water lines because it rusts easily, while galvanized cannot be used for gas lines because the zinc can clog the lines when it begins to flake, galvanized pipe is the safer pipe to use in water lines.     http://www.xysteelpipe.com/info/What-is-the-d...

    Precision pipe is a carbon, alloy or stainless steel tube with high precision size.Usually it is made by hot rolling or cold rolling.Therefore, the precision pipe is a seamless tube.     Key processes in manufacturing the precision steel pipe.     During manufacturing processes, the key point is to do the annealing for raw materials.     Precision steel pipe manufacturing flow chart:     Raw Material Inspection – Remove Oxide Layer – Visual Inspection – Heating – Hot Rolling – Pickling and Passivation (Phosphating) – Grinding – Lubrication and Drying – Cold Rolling (Internal and external extraction) – Remove Oil – Ends Cutting – Inspection – Marking – Packing and Storage     As we know, most of precision steel pipe has cold drawn and hot rolled process. On the contrast, cold rolling will be more complicated. Not only the pipe need to be continuous rolled by three roller, but also the test have to be done after ext...

    The heat treatment of 15CrMo seamless steel pipe is one of important process in manufacturing process.     Compared with other processes, the heat treatment generally does not change the shape and chemical compositions of 15CrMo seamless steel pipe. It changes the chemical composition of the surface of 15CrMo seamless steel pipe, to improve the performance of the workpiece. In order to make the 15CrMo seamless steel pipe has the required mechanical properties, physical properties and chemical properties, heat treatment is necessary besides selecting reasonable materials and a variety of forming process.     Steel is the most widely used material in the mechanical industry. In the 1960s, the heat treatment takes advantage of plasma field which make 15CrMo seamless steel pipe obtain new technology for surface heat treatment and chemical heat treatment. Heat treatment can control the microstructure of steel, therefore, heat treatment is important for 1...

    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 mu...