Seamless Steel Pipe

　　 ERW carbon steel pipe has this processing technology, which has the advantages of post welding heat treatment, eliminating residual stress in weld and heat affected zone, refining grain, small heat affected zone and fast heating speed. It can greatly improve welding speed and weld quality. It can be used without pickling, shot peening and trimming steel as blank, and welding alloy at the same time. Steel, high alloy steel and non-ferrous metal pipe greatly reduce the power consumption of the unit, and equipped with a set of welding equipment can produce ERW carbon steel pipe. 　　But at the same time, the larger the diameter of the carbon steel tube unit, the more restrictions on the weight of the steel strip and the thickness of the raw material, the storage equipment is limited by the spiral looper. In addition, the ERW carbon steel tube unit has a higher line speed, and the speed of the arc welded pipe is generally 3m / min, which does not match each other. Therefore, ERW carbon...

　　The welding process of welding pipeline unit is complicated and changeable by using uncoiling, pinch, straightening, shearing, orientation, butt welding, looper, and medium. 　　 Welded pipe 　　The concrete butt welding process is: 　　1, when the coil is positioned well, the conical head of the coiler can be inserted into the coil at the same time, the lead is sent to the roller, and the roller is rolled down, and the coil car and the magnetic roller can be returned in situ. 　　2, in order for the spring steel to operate accurately in the center, the whole axial movement + 150mm before the uncoiler runs. After the uncoiler is started, the steel belt passes the pinch roll to the leveling machine with the dust removal device. 　　3, the straightening of the spring steel strip is used to cut the head and tail of the steel strip with a sliding hydraulic shear. (the steel strip head can be immediately slid into the inside of the scrap, the tail of the strip can be cut off by the output...

　　Requirements for API 5L X52 seamless tube in standard 　　1. there are no cracks, wrinkles, wrinkles, spalling, crusts and scales on the inside and outside surfaces of the steel pipes. These defects should be completely eliminated. The grinding of surface defects should be smooth and smooth. The depth of clearance should not exceed the negative deviation of nominal wall thickness. The actual thickness of the defect removal zone should not be less than the minimum allowable wall thickness of the steel tube. The welding method should not be used. 　　2. the straight path of the inside and outside surface of the steel pipe must be grind. The depth of clearance should not exceed the negative deviation of nominal wall thickness. The actual thickness of the defect clearance area should not be less than the allowable minimum wall thickness of the steel pipe. 　　3. end shape: cut both ends of the steel pipe into right angles and remove burrs. 　　The welding interface is not allowed on the ...

　　In order to maintain a stable heat treatment product during the induction heat rapid heat treatment process, the following measures should be taken on the production line: 　　(1) The casing plant adopts the technology of continuous heating of steel bridges and uses bridging technology to improve the phenomenon of low steel temperature and increase steel production. A computer is used to control the head and tail of the steel; dual-frequency power is used to control the temperature at the end of the steel pipe; rotary joints are used to achieve great progress, etc. to increase the longitudinal temperature uniformity of the steel. 　　(2) Advanced steel conveyors are used to ensure uniform steel speeds. Steel tubes and large bars should rotate at a constant speed. The transmission mechanism should use variable frequency drive to improve the stability and reliability of the mechanism. This is one of the important conditions for ensuring that the longitudinal temperature of the phase ma...

　　The seamless steel pipe is a hollow section steel. The hollow pipe means that the steel pipe is hollow. It is for this reason that the seamless pipe is used in a large amount in transportation, and the steel pipe has been passed. The seamless treatment and the precision of the pipeline are also very good, so that users can use the seamless steel pipe more conveniently in transportation, such as transportation of oil, natural gas, tap water and so on. 　　When the seamless steel pipe and the ordinary solid steel pipe are in many aspects the same, the weight of the former is very light, which makes it a new economical steel, so it is used in the manufacture of parts and mechanical parts. Oil drill pipe, bicycle frame, barrel and so on. Moreover, the use of seamless steel pipe can improve the material utilization rate without the waste of raw materials, and the production process can be simplified. For example, the current jacks, rolling bearing rings and the like are all made using sea...

　　Features of LSAW steel pipe on technical： 　　1.Pipe forming process, the steel sheet uniform deformation, 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, effectively improve the dimensional accuracy of steel, improved the distribution of internal stress of the steel pipe, to avoid damage due to stress caused by corrosion, it is also conductive to the cons...

　　Austempering is one of the effective quenching methods for reducing the deformation and cracking of seamed steel pipes (straight seam steel pipes , spiral steel pipes and erw steel pipes) and seamless steel pipe, but how to properly use the process should be based on the material, size, hardness and toughness of the steel pipe. The requirements for deformation, as well as the specific working conditions, etc., are reasonably selected. The following issues to be noted for the isothermal quenching of seamless steel tubes are summarized below for reference by heat treatment operators. 　　[1] For austempering of steels with low hardenability such as carbon seamless steel tubes, the quenching heating temperature should be appropriately increased, the stability of austenite should be increased, and the high temperature non-Bayesian in the isothermal process should be avoided and prevented. The transformation of the body. 　　[2] Austempering is limited by the size of steel and steel. In t...

　　High-frequency welded pipe is now often used as a steel, in the machinery industry is very wide application, which is inseparable from its advantages. Here are some advantages of high-frequency welded pipe. 　　High-frequency welding steel pipe, mainly using high-frequency current with skin effect and proximity effect two features, so the edge of the weld current is highly concentrated on the surface, the tube welding edge in a very short period of time the heating to the desired welding temperature and then extruded through the tube to tube welding synthesis. High-frequency welding process has many advantages, the material on the tube and pipe Size wide adaptability. High-frequency welding is not only to improve welding speed and can get a small heat affected zone and weld burn through the good. 　　As the high-frequency welding pipe with good quality, small burr inside and outside, high welding speed, lower power dissipation, etc., are widely used and promoted. In the welded pipe, ...

　　The boiler tube is made by tube. Boiler tube operated under high temperature and high pressure conditions for long period, the material would be creep, plasticity and toughness would decrease, the original tissue changed, result in corrosion and so on. 　　Steel pipes for boilers should be: 　　1. sufficient lasting strength; 　　2. sufficient plastic deformation ability; 　　3. hot brittle; 　　4. high oxidation resistance, resistance to coal ash, resistance to natural gas corrosion at high temperatures, steam and stress corrosion; 　　5. good tissue stability and good process performance. 　　The steel for high-pressure boiler tube are carbon steel and pearlite, ferrite and austenitic stainless steel.

　　 LSAW steel pipe quality check methods: magnetic force, soaked inspection, ray detection, ultrasonic flaw detection 　　 Magnetic force 　　Magnetic flaw detection can only find the appearance and appearance of magnetic straight seam welded pipe shortcomings, and the shortcomings can only do quantitative analysis, the nature and depth of the shortcomings can only be based on experience to estimate. Magnetic inspection is the use of magnetic field magnetization of ferromagnetic Longitudinal Welded Pipe leakage occurred to find the shortcomings. According to the measurement of magnetic flux leakage method is not the same, can be divided into magnetic powder method, magnetic induction method and magnetic recording method, during which the most widely used magnetic powder method. 　 　Soaked inspection 　　Penetration test is the use of some of the liquid permeability and other physical properties to discover and show shortcomings, including the color check and fluorescence detection of...

　　Reducing flanges are designed for when there is a change in the pipe size. The predominate flange (dimensions) matching the larger pipe size (NPT) but having a smaller bore matching the smaller pipe size (NPT). These flanges normally come in blind, slip-on, threaded and weld neck flanges. They are available in all pressure classes and provide a good alternative to connecting two different sizes of pipe. This type of flange should not be used if an abrupt transition would create unwanted turbulence, such as at a pump. 　　A reducing flange consists of a flange with one specified diameter having a bore of a different and smaller, diameter. Except for the bore and hub dimensions, the flange will have dimensions of the larger pipe size. 　　Material of Reducing Flange: 　　Cabon steel: A105, A350 LF2 　　Stainless steel: A182 F304/F304L/F316/F316L/F321 　　Alloy steel: F11, F12

　　The lap joint flange is practically identical to a slip-on flange except it has a radius at the intersection of the bore and flange face. This radius is necessary to have the flange accommodate a lap joint stub end. Normally, a lap joint flange and a lap joint stub end are mated together is an assembly system. 　　Specifications of Lap Joint Flange: 　　Standards: ANSI, MSS, API, AWWA, DIN, JIS, BS and GB. 　　Process: free forging, plate cutting. 　　Sizes range: 1/2" to 64" (and much larger size according to customers' demands). 　　Materials: Carbon steel, stainless steel and alloy steel. 　　Printing: Carbon steel and alloy steel with yellow print, black print, oil or zinc. 　　Packing: in wooden cases, wooden pallets or as per customers' special requirement, Standard Export Package. 　　 Check www.tjxysteel.com for more info

　　General seamless stainless tube production process can be divided into cold drawing and hot rolled, cold rolled seamless steel tube production process generally more complicated than hot rolled, three-roll rolling tube billet must first, after the extrusion sizing test, if there is no response after crack on the surface of pipe have to be cut after cutting machine, cutting grow about a meter of billet. And then enter the annealing process, annealing with acid pickling liquid, pickling when should pay attention to whether there is a lot of bubble surface, if there is a lot of bubbles show that the quality of the steel tube are not up to the standard of the response. Appearance on cold rolled seamless steel tube is shorter in hot rolled seamless steel pipe, cold rolled seamless steel tube wall thickness generally smaller than hot rolled seamless steel tube, but the surface looks brighter than the thick wall seamless steel tube, not a lot of rough surface, the diameter is not a lot of b...

　　After the stress-relieving heat treatment, the test results of the steel pipe are analyzed and it is concluded that: 　　1.The geometrical accuracy of the steel pipe is basically unchanged; 　　2.The elongation, section shrinkage and surface roughness of the steel pipe meet the technical requirements; 　　3.The impact energy of the steel pipe is increased by 83% compared with the cold working state, but the technical requirements of the hydraulic cylinder cylinder are still not reached; 　　4.The tensile strength, yield strength and hardness of steel pipes are greatly reduced on the basis of cold working; 　　5.The metallographic structure of the steel pipe is slightly improved compared to the cold working state, but it is far from the technical requirements of the hydraulic cylinder cylinder. 　　Since the stress relief annealing is mainly to eliminate the internal stress of the metal, the heating temperature does not exceed the phase transition temperature of the material in the he...

　　Welded steel pipe like ERW steel pipe, is now widely used among various industries. And the types of weld pressure rolls applied the pressure require for the weld are as varied as the welding units used to supply the heat. 　　Then, how many roll units are needed in steel pipe production? 　　According to different size and shape of the product being welded, the number of rolls in the weld squeeze box is proportionate. There are no hard and fast rules; however, common guidelines for round tube or pipe size ranges are as follows: 　　3/8 to 2 in. uses two-roll units. 　　1/2 to 3 1/2 in. uses three-roll units. 　　2 to 10 in. uses four-roll units. 　　Larger than 10 in. uses five or more rolls. 　　Now with the wide demands coming from customers, there are square, rectangular, hexagonal which are welded in the finished shape rather than being reshaped after being welded round. 　　 http://www.xysteelpipe.com/info/How-many-rollers-are-needed-for-steel-pipe-production-1294-1.htm