LSAW Steel Pipe

　　The API SPEC 5L specification provides standards for pipe suitable for use in conveying gas, water, and oil in the natural gas and oil industries. The API SPEC 5L covers seamless and welded steel line pipe. It includes plain-end, threaded-end, and belled-end pipe, as well as through-the-flowline (TFL) pipe, and pipe with ends prepared for use with special couplings. 　　PRIME STEEL PIPE API 5L steel pipe comes in a variety of wall thicknesses and is manufactured domestically, to order, to meet our customer’s particular application requirements. We offer both seamless and welded (ERW*) to meet the particular challenges of all transmission environments. 　　 Line pipe grade designations come from API Spec 5L Specification for Line Pipe. Standard Line Pipe has grade designation A and B. Stronger grades have the designation X followed by the specified minimum yield strength of the pipe steel, measured in kilopounds per square inch (abbreviated ksi), e.g. X60 for pipe having a minimum yi...

　　In the production process of thick-walled straight seam steel pipes , it is necessary to perform strict production processes. If the production process is unreasonable or the production equipment is not used properly, deviations will occur. This situation is called misalignment, which clearly leads it is necessary to prevent the cause of the misalignment of thick-walled straight seam steel pipes. 　　What are the causes of the wrong side of thick-walled straight seam steel pipes? 　　1. The thick side straight seam steel pipe has the wrong side, then you should first check whether the sickle of the steel belt is bent, the sickle bending is the main factor causing the wrong side of the steel pipe; 　　2. When the remaining height of the steel strip head-to-tail butt welding seam is relatively large, if the correct processing is not performed during forming, it will easily cause a large misalignment; 　　3. If the shape and dimensional accuracy of the uncut edges of the steel strip are...

　　Features of outer thick tubing : 　　1. Enhance connection strength through upsetting of joints; 　　2. Sealing is achieved through cooperation with thread grease. 　　Disadvantages of the outer thick tubing: 　　1. Low processing efficiency, serious waste of factory capacity; 　　2. Slip failure easily occurs under tensile load; 　　3. Can't meet the requirements of gas seal under higher pressure; 　　4. The performance of the upper shackle is not good and the anti-sticking ability is poor; 　　5. Limited thread repair; 　　6. Difficulty processing accessories such as short sections; 　　7. The tubing order cycle is long, the price remains high.

　　Cold drawn erw steel pipe, which is one of the best choices for the production of multi-stage hydraulic cylinders. Its process is the same as that of precision seamless pipe cold drawing. It is precision drawn by precision resistance welding (ERW) and manufactured with EN. 10305-2 EU mechanical cold drawn carbon steel welded pipe standard. 　　After the electric resistance welded pipe is welded, the whole pipe body is normalized to ensure the homogeneity of the weld and the heat affected zone with the rest of the metallographic structure and mechanical properties; cold drawing and subsequent heat treatment (eliminating internal stress) and the steel pipe have good dimensions. And mechanical properties. 　　After the welded steel pipe is processed by cold drawing and deep processing, a high-quality steel pipe with small dimensional tolerance and good mechanical properties is obtained. 　　In addition, cold drawn welded pipes have significant advantages over cold drawn seamless pipes i...

　　Large diameter seamless steel pipe is over 1000MM, which is made from steel ingot or solid tube, and then processed by hot rolling or cold rolling. Sometimes, the seamless steel pipes is longer or short while using. Short seamless steel pipes can be welded, longer seamless steel pipes can be cut off. Here are three methods of cutting large diameter seamless steel pipes to proper length to meet industry needs. 　　1. By saw machine 　　Saw machine can make neat section which is convenient for welding. The disadvantage is low efficiency. 　　2. By gas cutting 　　Though gas cutting is fast, the disadvantage is presented notched surface which is not good for construction. 　　3. By cnc cutting machine 　　By cnc cutting machine, seamless steel pipes manufacturers will not save a lot cost but also can obtain smooth section of seamless steel pipe which has not much difference from cutting by saw machine. 　　If you are looking for a new range of strong and durable pipes, you have come at...

　　Most of the seamless steel tubes are medium and high carbon alloy steels. After quenching, some supercooled austenite has not been converted into martensite, and remains in the use state as residual austenite, which affects the performance. If it is cooled below zero, it will promote the martensite transformation of retained austenite. Therefore, the essence of cold treatment is to continue quenching. The quenching stress at room temperature and the quenching stress at zero degrees are superimposed. When the superimposed stress exceeds the strength limit of the material, it will form a cold treatment crack. 　　Precaution: 　　(1) Seamless steel pipes are boiled in boiling water for 30-60 minutes before quenching after quenching, which can eliminate 15% -25% quenching internal stress and stabilize residual austenite, and then perform conventional cold processing at -60C, or After -120C cryogenic treatment, the lower the temperature, the more the amount of retained austenite is trans...

　　The difference between ERW straight seam resistance welded steel pipe and LSAW straight seam submerged arc welded (UOE) steel pipe: 　　1. The difference between raw materials and production capacity 　　The raw material of ERW steel pipe is hot rolled steel coil, and the raw material of UOE steel pipe is hot rolled steel plate. Therefore, ERW steel pipe can realize continuous pipeline operation, high production efficiency and low production cost; while UOE steel pipe is processed by steel plate, continuous pipeline operation cannot be realized, production efficiency is low, and production cost is high. 　　The ERW steel pipe is limited by the thickness of the coil. Generally, the maximum thickness that can be produced is 25mm, and the maximum caliber that can be produced is 660mm. The maximum thickness that UOE steel pipe can be produced is 40mm. The maximum production diameter is 1422mm. 　　2. Welding difference 　　No welding wire is required for ERW steel pipes; welding wire is ...