ERW Steel Pipe

　　Pipeline transport with transport capacity, low safety, transportation cost advantages, is the best means of transporting petroleum products. However, because pipeline cracks and defects have a greater impact on the safe operation of the pipeline, cracks in the structure itself is also more complicated. 　　By the intelligent instrumentation detected cracks and defects are generally located inside and outside wall or coating. Cracks and defects in the pipe can generally be divided into two categories: direct cracks and defects, indirect cracks and defects. Cracks and defects directly refers to the state and the wall cracks and defects are directly related . These cracks and defects have a direct impact on the integrity of the pipe or tube sections, such as corrosion, cracks or scratches. Indirect refers cracks and defects relating to the integrity of the pipe material damage or system failure. With the increasing use of time, they can cause a direct pipeline cracks and defects occur....

　　Before the pipe insulation of the joint, the welding port, planing, beveling pipe end to end face, blunt edge and gap shall be repaired first, which shall meet the following requirements.The chuck does not help narrow the gap between the solder and the heat solder. 　　Counterpart pipe insulation should be flush with the inner wall, 300mm long straightedge should be used in order around the inner wall abutting the interface, the wrong port of tolerance should be 0.2 times the wall thickness, and no greater than 2mm. 　　When the counterpart of the weld location should meet the following requirements: a straight pipe from the upper section of the center plane between the two butt weld, nominal diameter greater than or equal to 150mm, not less than 150mm, when the nominal diameter less than 150mm, should not be smaller than the outer tube path. The pipe should;be measured from the interface center counterparts at 200mm flatness, when the pipe when the nominal diameter of less than 100m...

　　Each kind of steel pipe would have its heat treatment during production process. No matter you are seamless steel pipe or ERW steel pipe, we should figure out the method before production. Today, we would have an introduction for heat treatment method for carbon steel pipe. 　　There are two methods for improving carbon steel pipe’s performance. One is adjusting the chemical composition of the steel alloying; the other is the heat treatment. For the heat treatment, we should combine it with shaping deformation. Of course, in the field of modern industrial technology, heat treatment to improve the performance of the steel still occupy a dominant position. 　　Thus, for wholesale carbon steel pipes, it is important to figure out the chemical characters for each kind of steel pipe. 　　 http://www.xysteelpipe.com/info/Heat-treatment-method-for-carbon-steel-pipe-1230-1.htm

　　Capillary rolling is the main deformation process of seamless steel pipe production. Its function is to make the wall thickness of the capillary close to or reach the thickness of the finished pipe wall, and to eliminate the uneven thickness of the longitudinal wall produced by the capillary during the perforation process. The surface quality of the inner and outer parts of the waste pipe, controlling the outer diameter and roundness of the waste pipe. The hollow capillary tube is rolled into a waste tube that is close to the finished size. 　　1. Automatic pipe rolling machine: The automatic pipe rolling machine is a two-roller irreversible vertical rolling mill. It is characterized in that a pair of high-speed reverse-rotating return rolls are arranged behind the work rolls, and the function is to send the once-rolled capillary tubes to the front. The second rolling is carried out, so its production efficiency is low, and most of the domestic units have been modified or eliminated....

　　Mechanical properties would be our first lesson before purchasing seamless steel pipe or other welded steel pipe. Today, our main topic would be carbon steel pipe for its mechanical properties, rust situation and density question. 　　Mechanical properties, such as casting process, segregation, non-metallic inclusions, porosity, shrinkage and cracks, should be checked out carefully before purchase. 　　For rust situation, we should figure out that carbon steel pipe would be with a high corrosion resistance and adhesion. Under this situation, it would service for human beings with long time. Of course, no harmful substances for steel pipes would be the first step before production. 　　Talking about density, we should know that it is calculated by dividing the mass by the volume. The density of carbon steel is approximately 7.85 g/cm3 (0.284 lb/in3). 　　 http://www.xysteelpipe.com/info/Corrosion-and-density-of-carbon-steel-pipe-1228-1.htm

　　1. Quality detected by sampling way depending on design requirements. 　　2. Visual inspection by the root. Covering the surface layer should be uniform, smooth, no bubbles, wrinkles, protruding tumor and uneven hem overlay defects. 　　3. Film thickness with magnetic gauge, measuring 1.5 meters in every single section of pipe ends and the middle point of the circumference, the film thickness should meet two 85%: the 85% of the thickness of the measuring point design requirements, less than the thickness of the measuring point, with the minimum should not be less than 85% of the design thickness. 　　4. Check the pinhole pinhole tester, found pinholes, sanding with sandpaper grinding machine painted up. 　　5. Insufficient film thickness or pinholes, after curing repair should be reviewed, the failure to repair again, until qualified. 　　6. Check adhesion, with a hard coating on the draw tool is cut at an angle of 60 to conduct random checks, shall be classified through direct coati...

　　After hot-rolled seamless steel tubes, the grain refinement of steel, the ingot destroy the cast structure, eliminate defects and microstructure of the resulting dense PIPE, improved mechanical properties. Air bubbles present before the steel pipe, cracks and loose, after hot rolling at high temperature and pressure will be welded together. 　　Although there are many advantages of hot-rolled seamless steel pipe , but its shortcomings must be clear, after the hot-rolled steel, non-metallic inclusions in steel interior is pressed into thin slices, stratification. Layered in the thickness direction of the steel in tension performance deteriorated significantly, there interlayer tear weld shrinkage. 　　Been to hot-rolled steel, must have advanced technology, if technology does not pass, steel uneven residual stress caused by cooling during hot rolling. Residual stress in the absence of external forces are balanced inside, but in the case of steel external forces under are affected to s...

　　Delivery standard length of carbon steel pipe , also known as user requirements length or the length of the contract, there are four provisions in the existing standards: 　　A, Normal length(also known as non-random length): any length within the length of the standard required and no fixed length requirements are usually called normal length. 　　B, Cut length: cut length should be within the range of usual length, which is required in the contract a fixed length dimension. But the actual operation is definitely cut out and it is unlikely, so the standard specifies the length of the length positive deviation allowed. Production decreased length than the length of the tube length of pipe is usually the yield big margin, producers proposed fare increase is reasonable. Markups enterprises are not consistent, usually based on the base price increase of about 10%. 　　C, Double length: according to the requirement of order, the length is the integer multiple and referred to as double le...

　　 Steel pipe hydraulic pressure test equipment is mainly used for the following components: automotive hoses: steering tube, brake pipe, air conditioning pipes, fuel pipes, cooling pipes, cooling hoses, heater hoses, air filter hoses, turbo system hose, engineering hydraulic hose; air hose and manifold; hard pipe or fittings and other automobile brake pump, radiator, oil cooler, cylinder; engineering hydraulic hose is mainly used for hydraulic equipment, engineering machinery, mining machinery, such as hydraulic pipe burst test; pressure equipment body, such as the need to detect the cylinder pressure, the burst test. 　　 Device Features: 　　1, with a gas-driven automatic booster pump, the output pressure can be easily adjustable, controllable; 　　2, advanced technology, reasonable structure design. With small size, light weight, elegant appearance characteristics; 　　3, all bearing parts are international famous brands of standard parts, without any solder connections for easy r...

　　Pressure fluid transport with spiral submerged arc welded pipe SY5036-2000, is mainly used to transport oil, natural gas pipelines; 　　Pressure fluid transport with spiral seam high frequency welded steel pipe SY5038-2000, high frequency lap welding method for spiral seam high frequency welded steel pipe pressurized fluid delivery. Strong pressure steel, plastic, and easy welding and machining molding; 　　General low pressure fluid with spiral submerged arc welded pipe SY5037-2000, single-sided or double-sided automatic submerged arc welded into the legal delivery SAW pipe for water, gas, air and steam low pressure fluid. 　　Common spiral steel pipe standards are generally divided into: SY / T5037-2008 (Ministry of standard, also known as ordinary fluid pipes with spiral submerged arc welded pipe), GB / T9711.1-2008 (GB, also known as the oil and gas industries - Steel pipe technical delivery conditions for the first part: a grade steel (demanding a GB / T9711.2 B grade steel)), ...

　　For carbon and mild steel pipe, they all have seamless steel pipe type. And recently, we Threewaysteel has added mild steel pipe in our product’s category. In order to solve some customer’s confusion about the choice of carbon or mild one. Today, we will show the difference between them. 　　1. Carbon steel pipe contains mild steel pipe to some extent. 　　2. Mild steel pipe would have a very low carbon percentage when compared with the special carbon steel pipe(we can see detailed components in mild steel pipe's production description). 　　3. Mild steel pipe may have higher ductility than carbon steel pipe types. 　　4. Mild steel pipe would not strong as carbon steel pipe. 　　With more detailed information, you can have a view at the website or you can contact us directly. 　　 http://www.xysteelpipe.com/info/Difference-between--mild-steel-pipe-and-seamless-carbon-1180-1.htm

　　The advantage of this erw steel pipe processing technology is that there is a heat treatment process after welding, eliminating the residual stress in the weld and heat-affected zone, refining the grain, the heat affected zone of the weld is small, and the heating speed is fast, thus greatly improving the welding speed and weld quality, and can be used as blanks without pickling, shot peening and trimming. At the same time, alloy steel, high alloy steel and non-ferrous metal pipes can be welded to greatly reduce the unit power consumption. A set of welding equipment can be used to produce each. 　　However, for erw steel pipe units, the larger the diameter, the more limited the strip weight and wall thickness of the strip steel. The storage equipment is limited by the spiral looper. In addition, the erw steel pipe unit has a higher line speed and is buried. The arc welded pipe speed is generally 3m/min, which does not match each other. Therefore, erw steel pipe units need to fully ut...

　　Inner fold of hot rolled seamless steel pipe refers to spiral rendered in the steel pipe inner surface, the semi-helical or irregular distribution of the zigzag folding, some rendered as linear warping. Below are details: 　　1.An inner flap: presenting a straight line, a spiral or a semi-helical sawtooth defect on the inner surface of the steel pipe. 　　2. Inside scarring: scars in the steel pipe inner surface, generally easily peel off. 　　3. Warping: a straight line or intermittent small nail-like tilt leather. Often seen in the capillary head, and easy to peel. 　　4. Inside straights: a straight shape scratch with a certain width and depth. 　　5. Inner edge: a straight shape protrusion with a certain width and depth. 　　6. Inner drum kits: a super and regular protrusion and outer surface is not damaged. 　　7. Pull pits: a regular or non-regular pit and the outer surface without damage. 　　8. Internal thread (this defect produced only at Accel units): spiral traces often se...

　　The characteristics of thick walled seamless steel pipe production line is the production line length, transmission equipment, tension control strict requirements, strip steel is easy to deviation, required continuous production. Thick wall seamless steel tube rolling process, local advance into the austenitic seamless steel tube manufacturer non recrystallization region and two-phase zone limit. Non recrystallization zone rolling to get ferrite austenite grain size and uniform and rolling the total deformation volume and pressure rate, when the total amount of deformation and pressure ratio is greater, ferrite grain finer and more uniform. Local area is also known as the crack opening and the central, due to excessive cold, compared with the substrate side to advance into, therefore opening cracks of the ferrite grain size is smaller, base material grain changes little, two differences lead to rolling crack. 　　Thick wall seamless steel pipe continuous hot dip galvanizing producti...

　　With the development of national economy, thick wall LSAW steel pipe in the offshore platform, such as high temperature and high pressure of the pressure vessel, wind pipe pile has been widely applied. Manufacturing this kind of steel pipe generally use D36 steel, S355 steel and is Z to the performance of the steel plate structure, plate thickness, larger carbon content is higher, and the high carbon equivalent, poor weldability, hardening tendency, lower the welding performance of welding joint, easy to produce cold crack, especially in the transverse cracks appear probability is larger. After welding cracking, in addition to the necessary control measures, but also pay attention to the workpiece to repair in time. S355 steel, for example that appear after welding transverse crack repair measures. Concrete is: 　　 1, confirm the defect 　　100% of all weld on UT inspection, mark the location of the crack, length, depth and direction. If the welding line are flawed, and suggest tea...