API PSL1 X42 DN200 HFW Steel Pipe

Why does HFW high frequency straight seam welding process meet the production requirements of this pipe?

If X42 material is the "performance core" of the pipe, then HFW technology is its "efficiency core" and "quality assurance". The core production requirements of API PSL1 X42 HFW steel pipe are "stable batch, controllable precision, reasonable cost and up-to-standard quality", and HFW process perfectly fits these four requirements, which has irreplaceable adaptability advantages compared with other production processes, which is also the key to choose HFW process as the core processing technology.

First of all, HFW process has high production efficiency and is suitable for large-scale mass production. The application scenarios of this pipe are mostly batch projects, which require a large number of standardized pipes to be supplied quickly. The HFW process adopts automatic continuous production mode, and the whole process is automatically controlled from steel plate cutting, bending and forming to welding, cooling and nondestructive testing. The welding speed can reach 10~30m/min, far exceeding LSAW and SSAW processes, and the average daily output of a single production line can reach hundreds of tons, which can meet the rapid supply demand of large-scale batch projects. At the same time, the process flow of HFW is simple, and there is no need for complicated flux laying and slag cleaning, which reduces human error, ensures the quality consistency of different batches of pipes, and meets the quality requirements of API PSL1 standards for batch products.

Secondly, the forming precision of HFW process is high, which meets the standard size requirements of API PSL1. Fluid conveying pipes require strict dimensional accuracy. Excessive dimensional deviation will affect the sealing performance and construction efficiency of pipeline connection, and even lead to leakage hazards. HFW process can accurately control the heating temperature and range through high-frequency current, and cooperate with precision forming die and extrusion device to realize precise forming of pipes. The dimensional accuracy is much higher than that of SSAW process, and it is also better than that of LSAW process for small and medium-sized thin-walled pipes. At the same time, after welding, sizing and straightening links are set up to further correct the dimensional deviation and ensure that each pipe meets the API PSL1 standard and engineering design requirements.

Thirdly, the welding quality of HFW process is reliable and meets the strict inspection requirements. The core of pipeline transportation safety depends on the quality of weld, especially the transportation of flammable and explosive fluids, and weld defects can easily lead to safety accidents. The API PSL1 standard requires that the weld should be tested by ultrasonic wave, water pressure test and other multiple tests, and the defect rate is less than 0.3%. HFW process makes use of the characteristics of high-frequency current to make the weld penetration uniform and width consistent, and the strength and toughness of the welded joint are close to the level of the base metal, so it is not easy to produce defects such as cracks and incomplete penetration. And welding does not need flux, so as to avoid inclusion defects caused by flux residue, and unqualified products can be eliminated in real time with on-line nondestructive testing equipment, so as to ensure the weld quality to meet the standard.

Finally, the process cost of HFW is reasonable, which is suitable for the positioning of high cost performance of pipes. The core positioning of this pipe is "standardization and high cost performance". Compared with seamless steel pipe production, HFW technology only consumes 60%~70% of its energy, and the utilization rate of raw materials is as high as 98%, which greatly reduces the cost of resources and energy consumption. Compared with LSAW process, it does not need flux and has a high degree of automation, and the labor cost is reduced by more than 40%, while reducing the cost of environmental protection treatment. The combination of the cost advantage of HFW process and the economy of X42 material further highlights the cost performance advantage of API PSL1 X42 HFW steel pipe, making it highly competitive in the fluid transportation pipe market.