LSAW Steel Pipe

 Tianjin Xinyue Steel Group has signed order with company which has cooperation with Bangladesh government. Order begin to product in January. First shipment goods arrived in the Chittagong, including 5o ton ERW pipes with black painting and 4 wooden package small fitting. Goods finally arrived in the destination port and customer has been expecting for so long. Because of CNY holiday, vessel date is delayed. Because of COVID-19 virus, vessel arrived in the port in the 13rd March, which should be arrived in the 4th March. Bangladesh customer has expected this day for a long time and finally goods arrived in the customer. Client arrange engineer to test goods immediately. Pipe length, painting content, thickness all conform to the standard for ASTM A 53. Client is very satisfied and expect next cooperation. Tianjin Xinyue always hold the value to offer best products with good quality, best service and shortest delivery time. Welcome your inquiry. http://www.tjxysteel.com/news/Bangla...

　　From manufacturing processes we can know that SAW (LSAW, SSAW) and ERW pipes are entirely different right from formation, welding etc. and hence, the performance of both the pipes differ in the following aspects: 　　1. The surface quality of ERW pipes are better when compared to SAW (LSAW, SSAW) pipes, as they are smooth and have a better finish. In most of the SAW pipes, it is mainly about the weld reinforcement internally and externally. 　　2. The defects found in ERW pipes are lesser than SAW pipes. As there is a solvent deposit in SAW pipes, it results in more defects apart from the defects in the volume. The defects found in ERW pipes are only confined to wire-line and straight welds and it can be inspected easily. The defects can be noticed easily and the ultrasonic reflection on the surface makes it easier to detect. 　　3. The residual stress ratio in ERW is lower than SAW pipes. As ERW pipe deformation happens more in ERW followed by a sizing of flat oval, it results in ...

　　The ERW welding machine technology is used to realize the high frequency welding of the electromechanical system. The high-frequency welding equipment is composed of a high-frequency welding machine and a forming machine. A high frequency welding machine is usually made up of two parts of high frequency generator and feed device. The effect is to produce high frequency current and control it. By extrusion roll frame, the function of the molding machine is high frequency current. The extrusion and melting part eliminates the oxide and impurities on the surface of the steel and makes the steel plate completely integrated into one. 　　 ERW pipe 　　High frequency generator 　　In the past, the use of high-frequency welded pipe unit is the three loop: high-frequency generator; solid state inverter; electronic high-frequency oscillator, and then basically improved to a single loop. There are many ways to adjust the output power of high frequency oscillator, such as autotransformer, react...

　　The effect of roller adjustment on the quality of ERW has a process called roller adjustment when producing ERW pipes. During the production process, the roller is damaged or worn seriously. It is necessary to replace the unit on the part of the roller, or to produce a certain number of rollers continuously to meet the needs of the replacement of the whole roller. At this point, the roller should be adjusted to achieve excellent steel quality. If the roll adjustment is not good, it is easy to form the change of steel pipe seam, lap welding, edge wave, indentation or scratch on the surface of drum and pipe body, elliptical steel pipe and so on. Therefore, the roll adjustment prompt should be mastered when the roll is replaced. 　　1, replacing the standard steel pipe is usually the whole volume that needs to be replaced. The way of roller conditioning is to draw a baseline from the inlet to the outlet by adjusting the wire, so that each hole is located on the baseline and the molding ...

    During the station construction of gas and oil pipelines, valves, instrument and flanges installation requires tapping in the main pipeline. It is hardly to identify visually the base pipe straight seam location of high frequency electric resistance welding. Some boss mounting positions are very close to electric welding pipe seam. Hence, it is very necessary to study the deep research and analysis for the boss installation influence on the base pipeline. The paper analyses the residual stress distribution on the high frequency straight seam resistance welding pipeline by hole drilling, and original residual stress impact about the different boss welding positions on erw pipe. There is a sharp rise in stress and the longitudinal weld residual stress impact after the boss installation on the erw pipe is much larger than the mother pipeline.     The distribution of residual stress in erw pipe is closely related to its welding and forming process. HFW resistance w...