Seamless Steel Pipe

　　The packaging requirements for seamless steel tubes are basically divided into two categories: one is a common type of bundling, and the other is a similar container loading with a turnover box. 　 　1. Seamless pipe bundling 　　a. The steel pipe should be avoided during the bundling and transportation process, and the bundling signs should be uniform. 　　b. The same bundle of steel pipes shall be the same steel number (batch number), steel grade and steel pipe of the same specification. It shall not be bundled in the mixing furnace (batch number). If there is less than one bundle, it shall be bundled into small bundles. 　　c. The weight of each bundle of steel pipes should not exceed 50kg. The weight of the bundle can be increased with the consent of the user, but the maximum weight cannot exceed 80 kg. 　　d. For flat-end steel pipe bundles, one end should be aligned, the pipe ends of the aligned ends should be less than 20mm, and the length difference of each bundle of steel pi...

　　As we know ASTM A106 Grade B pipe is one of the most popular seamless steel pipes applied in different industries. Not only in pipeline systems like oil and gas, water, mineral slurry transmission, but also for boiler, construction, structural purposes. Here are standards referred for making ASTM A106 pipes 　　 References ASTM standards: 　　ASTM A530/ A530M This is the standard specification for the common requirements of the carbon, and alloy pipes. 　　E213 The standard for the Ultrasonic Examination test 　　E309 The standard for the Eddy Current examination test 　　E381 The standard for the plan of Macroetch test, for the steel products the steel bars, steel billets, blooms, and forging steels. 　　E570 The standard for the test plan for the flux leakage test of the ferromagnetic steel pipe and pipeline products. 　　Related ASME Standard: 　　ASME B 36.10M The nominal sizes standard specification for the welded and seamless steel pipe. 　　 Related Military standard: 　　MIL...

　　Steel pipe fitting are made of carbon or alloy steel pipe , plates, profiles, to a certain shape that could make a function (Change the fluids direction or rate) in pipeline systems. Mostly these fittings includes steel elbow (45 or 90 degree bend), tee, reducer (concentric or eccentric reducer), cross, caps, nipple, flanges, gasket, studs and etc. 　　For industrial purposes, in pipeline systems usually we need to change the transmission direction; Adjust fluids (oil and gas, water, slurry) flow rate; Open or close the pipelines, etc. So to complete these activities, steel pipe fittings will be applied. 　　The manufacturing processes for pipe fittings includes forging and shaping operations. As well as pressing, hammering, piercing, extruding, upsetting, rolling, bending, fusion welding and machining. Or the processes of combination of two or more of these operations. 　　During the manufacturing steel pipe fittings, below activities shall be noted: 　　1, Injurious imperfections, ...

　　Pipe is tube which complied with ASNI B 36.10 and B36.19 (for stainless steel). Its diameter represented with NPS which is different from actual diameters. 　　Pipe wall thickness is indicated by the schedule No. And the same NPS number can have various types of Sch. No. Such as STD, thickened wall thickness (XS) and special thick wall thickness (XXS), and so on. 　　Tubing refers to finished product meet the standard PG-27.2.1 [Outer diameter D≤5in.(127mm)], and which according calculate formula to select diameter, thickness and according the design. 　　Piping usually refers to finished product which calculated by PG-27.2.2 formula to select NPS and Sch. No, and follows the design requirements. 　　Sample of description 　　Nominal diameter is not the real diameter, real diameter is always larger than the nominal diameter. For example the pipe nominal diameter in 4 inch, wall thickness SCH 40, means the pipe real out diameter is 4 1/2 inch (114.3 mm), real wall thickness 0.237 inch...

　　Some clients would have trouble when talking about the quality of steel pipe( no matter seamless or ERW steel pipe). Today, Threewaysteel would have to confess that leave the cheap price alone, and we should take these production processes account when we discuss high quality steel pipe. 　　1. With the different standards, we should have open-hearth, basic-oxygen or electric-furnace with different chemical requirements during the whole steel pipe’s production process. 　　2. With the type difference, we should figure out the seamless and welding type before producing. 　　3. Of course, tension, bend, and flattening tests shall be performed to make sure that it must adhere to the mechanical properties of the standard. 　　4. What’s more, different steel pipes need different test before the wholesale. 　　5. Finally, suppliers should let the clients know any of the inspections and tests set forth in this specification where deemed necessary to ensure that the pipe conforms to the spec...

　　Corrosive forms of sanitary stainless steel tubes mainly includes crevice corrosion, pitting corrosion, balanced corrosion, intergranular corrosion and stress corrosion, etc. 　 　Crevice Corrosion 　　Crevice corrosion refers to local corrosion caused by electrochemical imbalance of the medium in the seams of sanitary 　　stainless steel tube components and punctate or ulcer form corrosion pits arise. 　 　Pitting Corrosion 　　Pitting corrosion refers to the fact that the surface passivation film of sanitary stainless steel tubes is destroyed by corrosion, producing local or slight corrosion, and the size of erosion point is generally less than 1 mm, the depth is larger than the aperture of surface corrosion. The process of pitting corrosion process is slow, first corrosion pits form, and then continuing to internal corrosion, even perforation. 　 　Balanced Corrosion 　　Balanced corrosion refers to the phenomenon of all surface corrosion after sanitary stainless steel tubes cont...

　　Double-sided Submerged Arc Welding (LSAW - Longitudinal Submerged Arc Welded), a new kind of welding method, was invented in 1940. Compared with the manual welding, the same point is that LSAW is using slag protection technology, but the slag is not the coating of electrode. The welding flux is made of by the slag specially smelting. This system of welding flux composed of a funnel transfer to the front of the welding through a pipeline. 　　The second difference is that the electrode was not used while adopts the welding wire because welding wire can be provided continuously. After having burned a electrode, we must throw a welding head, and we have to stop the operation, moreover, the operation continues by changing electrode to weld once again. 　　The first advantage of using this method is that it is fully automated. The second advantage is that the heat transfer and protection performance are stronger and the welding quality is higher under the submerged arc welding. The third ...

　　Production process of spiral steel pipe is complex, but it is one of the most popular steel pipes because it can be used widely. Spiral steel pipes are produced through welding process, then what issues should be noticed in the welding process? 　　Straight seam welded pipes are simple-produced with high efficiency, low cost and rapid developed. The strength of the spiral welded pipes is generally higher than that of seam welded pipes and narrow billet can be used to produce larger diameter welded pipes, besides, the same width billet can be used to produce welded pipes of different diameter. But compared with straight seam pipes of the same length, weld length increases by 30 ~ 100%, and production speed is lower. As a result, small diameter welded pipes mostly adopt straight seam welding, while large diameter welded pipes mostly adopt spiral welding. 　　Notes in the process of spiral steel pipe welding 　　From the aspect of economic benefit, pipe fittings of spiral steel pipes s...

　　 Stainless steel pipe fitting materials can't contact with other metals directly when lifting, non-metallic materials such as wood or rubber sheet should be padded. 　　Arc striking and arc stopping of stainless steel pipe fittings: back welding method should be adopted for arc striking and must be made within the groove, arc stopping should fill arc crater. Arc striking should be avoided in the pipeline and on the surface of pipe parent metal. If defects such as holes and crack are found when arc starting and arc stopping, they should be cleaned up. 　　Arc striking and arc stopping of stainless steel pipe fittings of multi-channel multi-layer welding should be staggered. 　　Argon tungsten-arc welding can be carried out only if the inner of pipes and cavity are protected by filling argon gas before back welding of stainless steel pipe fittings, pipe fittings and stainless steel pipes, pipe fittings and stainless steel pipes, pipe fittings connection and butt joint. 　　When st...

　　Thick-walled seamless steel pipe is a common type of thick-walled steel pipe. It is a special material for thick-walled steel pipe. For thick-walled seamless steel pipe, it is more important to protect the most basic use and play. More important performance. Thick-walled seamless steel pipe makes the important material of seamless steel pipe, its hardness is relatively large, generally it is more difficult to master the cutting skills and methods when cutting, so thick-walled seamless steel pipe can be successfully cut.In order to safely cut thick-walled seamless steel tubes, the following operations are recommended. 　　1. Mechanical cutting adopts two kinds of external installation and internal installation. It adopts the principle of turning tool to cut and groove the nozzle. The single machine span is large, the processing thickness is large, the waste is small, no pollution, and the processing process does not produce high temperature. Does not affect the pipe material, which i...