DIN 14mm Welded ERW Steel Pipe Hydrostatic Test

Hydrostatic Test High Frequency Welded Pipe Water Engineering ERW Steel Pipe

The high frequency welding thermal process of ERW steel tube results in the gradient of temperature distribution near the edge of the tube blank, and forms the characteristic areas such as melting zone, semi-melting zone, superheated structure, normalizing zone, incomplete normalizing zone and refiring zone.Among them, the austenite grains in the overheated area grow rapidly due to the welding temperature above 1000℃, and the hard and brittle coarse grain phase will be formed under the cooling condition.

The welding is pressure bonding rather than molten welding. Compared with molten welding, the welding heat affected area is relatively small and has little influence on the microstructure of the base material. After welding, the strength and toughness of the weld are different from that of the parent. According to the use of the material, the internal and external welding burrs can be cleaned or not.

Welding to the work piece can not be cleaned, can be welded thin wall pipe, welding metal pipe.For liquid transport: water supply, drainage. For gas transmission: gas, steam, liquefied petroleum gas. For structural use: as pile driving pipe, as bridge; Pipes for wharves, roads, building structures, etc. High-frequency straight seam welded steel tube process: longitudinal shear -- uncoiling -- strip flattening -- head and tail shear -- strip butt welding -- sleeve storage -- forming -- welding -- removing burrs -- sizing -- flaw detection -- flying cut -- initial inspection -- straightening of steel tubes -- pipe section processing -- hydrostatic test -- flaw detection -- printing and coating -- finished products. High frequency straight seam welded steel pipe is mainly used in water engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation, urban construction.

Hebei Synda International Trade Co., Ltd. is an import and export company (Subsidiary of Synda Group) approved by the People’s Republic of China. The company was established in September 2017 with a registered address in Cangzhou City, Hebei Province, China.Main business covers the import and export of goods and the sale of steel pipes , Application and development of metal materials, project development of valves and various steel pipe fittings. The product types include spiral steel pipes, straight seam steel pipes, seamless steel pipes, rectangular pipes, hot-rolled steel plates, cold-rolled steel plates, angle steel I-beams and other profiles, stainless steel pipes and various pipe fittings and valves. After years of development, the company's products have been applied to many large Chinese engineering projects, and are also exported to Southeast Asia, Central Asia, the Middle East, Africa, Europe, South America, North America and other countries and regions,have won wide recognition from many customers.

We has an efficient management team that is diligent in thinking and daring to climb. We have always been adhering to the tenet of "serving customers, mutual benefit and win-win", serving our partners wholeheartedly, and are willing to work together with partners for future development.