steel tube

　　ERW pipe, shorted for electronic resistance welded pipe, is manufactured by cold forming the steel coil into a round cylindrical pipe. Current passes between the two edges of the steel to heat the steel to a point at which the edges are able to connect together to form a bond using the actual welding process. ERW is normally used to transport liquid, such as petrol and gas, playing a significant role in the world line pipe transporting area. 　　 Seamless steel pipe , or SMLS, refers to a hollow steel pipe having no seam around. Due to its unique feature of strength and anti-bending, seamless pipe is widely used in construction, oil refining and chemical industries. 　　What is the difference tube billet quality between ERW steel pipe and seamless steel pipe? 　　Tube billet, a key raw material in manufacturing process, is a solid round bar of steel used to produce many pipe products. Compared with seamless pipes, the chemical structure of the tube billet of ERW pipe has more advanta...

　　In the pipeline anti-corrosion construction process, LSAW steel pipe anti-corrosion surface treatment is to determine the life of one of the key factors, it is LSAW steel pipe anti-corrosion layer and whether the combination of a solid premise. The study of professional organizations, in addition to the life of the coating depends on the type of coating, coating quality and construction of environmental factors, LSAW steel pipe coating surface treatment of life-span of about 50%, therefore, it is must to strictly in the surface of LSAW steel pipe requirements accordance with standard. Mainly rust removal methods of LSAW steel pipe are: 　　1, The use of solvent or emulsion cleaning the steel surface, to remove oil, grease, dust, lubricants and similar organisms, but it can not remove the steel surface rust, oxide, welding flux, etc., so the anti-government operations only as an adjunct. 　　2, Pickling 　　Generally two methods used to do chemical and electrolytic pickling process, ...

　　Electric Resistance Welding (ERW) pipe is manufactured by rolling metal and then welding it longitudinally across its length. Seamless pipe is manufactured by extruding the metal to the desired length; therefore ERW pipe have a welded joint in its cross-section, while seamless pipe does not have any joint in its cross-section through-out its length. 　　In Seamless pipe, there are no welding or joints and is manufactured from solid round billets. The seamless pipe is finished to dimensional and wall thickness specifications in sizes from 1/8 inch to 26 inch OD. Applicable in for High-pressure applications such as Hydrocarbon Industries & Refineries, Oil & Gas Exploration & Drilling, Oil & Gas Transportation and Air and Hydraulic cylinders, Bearings, Boilers, Automobiles 　　ERW (Electric Resistance Welded) pipes are welded longitudinally, manufactured from Strip / Coil and can be manufactured upto 24” OD. ERW pipe cold formed from a ribbon of steel pulled through a s...

　　1.The board used to making LSAW steel pipe , steel plate into the production line after the first full plate ultrasonic inspection; 　　2. The edge milling: through the two edges of the steel plate edge milling machine double-sided milling, make it meet the requirements of plate, plate edge parallelism and groove shape; 　　3. The bending edge: the use of bending machine for plate bending, make the edge of curvature; 　　4. Molding: on the JCO forming machine bending of the plate after half after many step punching, pressure into a "J" shape, and the other half of the steel plate bending, same pressure into a "C" shape, eventually forming the opening "O" shape 5. Early welding: the forming of lsaw mild steel pipe joint with gas protection welding and continuous welding (MAG); 　　6. The welding: the columns more wire submerged arc welding wire (up to 4) in the lsaw steel pipe inside; 　　7. The welding: adopting many wire submerged arc welding of columns...

　　ERW steel tube and spiral submerged arc welded pipe in the process of tube forming, welding and process the two kinds of steel pipe and there are some differences in performance. 　　(1) ERW steel pipe surface quality is superior to spiral submerged arc welded pipe, ERW steel pipe surface is smooth, smooth, beautiful, spiral submerged arc welded pipe inside and outside weld reinforcement. 　　(2) ERW steel pipe welds than the spiral submerged arc welded pipe is short, as long as the length of ERW steel pipe welds and steel, spiral submerged arc welded pipe weld length 1.4-1.7 times that of steel pipe length. Weld the longer, the higher the chance of weld defects. 　　(3) The standard requirements are basically the same geometric dimensions, but in-kind, ERW steel pipe sizing, straightening process, therefore, the geometric dimensions higher than the accuracy of spiral submerged arc welded pipe. 　　(4) ERW steel pipe weld defect types spiral submerged arc welded pipe. The dissolved ...

　　Metal surface exposed to the corrosive environment is easy to cause electrochemical reaction or chemical reaction. Seamless steel pipe's surface can be corrosive due to self-excited reaction and pitting corrosion reaction, coupled with the chloride ion, which form into a strong corrosive solution to accelerate the corrosion reaction. All these can destroy the passivation film of seamless steel pipes . Therefore, the surface of the seamless steel pipe must be regularly cleaned and maintained in order to keep its gorgeous surface and extend the service life. When cleaning the surface of seamless steel pipe, we must pay attention to the surface scratches, to avoid the use of bleach ingredients and abrasive cleaning solution, wire ball, grinding tools, etc. Water the surface at the end to get rid of the washing liquid. 　　How to maintain seamless steel pipes: 　　1. If there is dust and dirt, seamless steel pipes can be washed with soap, weak detergent or warm water. 　　2. If there...

　　ERW pipes means Electric Resistance Welded Pipes. ERW steel pipes and tubes are used in various engineering purposes, fencing, scaffolding, line pipes etc. ERW steel pipes and tube are available in various qualities, wall thicknesses, and diameters of the finished pipes. 　　1. Yield strength of the N80 is higher than the J55 up to 173 ~ 206 MPa. 　　2. On the same area of the sample, the elongation of N80 is higher than J55. 　　3. Under the same size, the same sample orientation, the same minimum sample size, J55 grade couplings, coupling stock, coupling material, semi-finished and coupling attachment material can absorb lower than N80 steel grade. 　　4. The nondestructive testing methods of seamless pipe,coupling stock, welded tube with J55 and N80 is differeent. 　　5. J55 and N80 steel grade is not the same color: length greater than or equal 1.8m, J55 painted a bright green, N80 painted a red; 　　6. J55 chosen by the manufacturer, or organize according to the order specified...

　　1. Extra length of tool joints provides plenty of space to operate while reducingwear rate and extending the service life of the outer diameter. 　　2. In order to extend the service life of the connection, API Bore Back Box adopts the larger size, whose function is four times as large as the other entire box. 　　3. The entire centre upset protects the tube from outer diamete wear by keeping the tube away from the hole wall, while at the same time reducing the risk of differential sticking. 　　4. HWDP with the drill pipe elevator can quickly and effectively deal with the task of drilling platform. 　　5. Research shows that 95% of the cause for drill string failure can be attributed to fatigue failure. However, the structure of HWDP has high fatigue strength.

　　Stainless steel seamless tube of metal and oxygen in the atmosphere to react, in the appearance will form an oxide film. However, the oxidation of the iron oxide formed on the ordinary carbon steel pipe continuously causes the corrosion to be enlarged, and as a result, the pores are formed. This good stainless steel seamless tube is damaged, we can use paint or oxidation-resistant metal such as zinc, nickel and chromium plating to cover the appearance of carbon steel, but, as we expected, this maintenance only is a layer of maintenance film, if the maintenance layer is damaged, the steel will begin to be corrosion. The corrosion resistance of stainless steel depends on the chromium, chromium is a part of steel composition, chrome on steel combined treatment, will change the appearance of the oxide type similar to pure chromium metal surface oxide. This tightly adhered chromium-rich oxide maintains the appearance and avoids further oxidation. 　　Heat treatment process includes heat...

　　Cold Drawn Seamless Steel Pipe Production Needs Attention To Control Points 　 　1. Capillary tube 　　The wall thickness of the capillary tube should be uniform, and the surface defects on the inner and outer surfaces should be small; the outer surface polishing and inner hole defect cleaning equipment should be arranged. 　 　2. Reexamination 　　Compared with ordinary cold drawn steel pipe, cold drawn precision seamless steel pipe production increases the hot-rolled capillary pickling re-inspection process, mainly to ensure that there are no defects such as folding and crack on the outer surface of the capillary tube, and the inner surface is excluded from folding and severely scribed. Tubes with defects such as pockmarks. 　　 3. Tools 　　Generally, the surface smoothness of tools used in the production of cold-drawn precision seamless steel tubes is above Ra0.4, the dimensional accuracy is above H3, and the hardness is required to be above HRC70. At the same time, it is require...