SSAW Steel Pipe is spiral submerged arc welded pipe. Its development history is as follows:

early stage

In the middle of the 20th century, with the development of welding technology, the submerged arc welding process gradually matured and began to be used in the production of steel pipes, and spiral submerged arc welded pipes came into being. At that time, it was mainly used in fields that had relatively low requirements on steel pipe quality and pressure bearing, such as low-pressure water transmission, thermal pipelines and piling pipes. The production process is relatively simple, the equipment investment is small, and the continuous welding of low-priced narrow strip coils to produce large-diameter welded pipes has certain cost advantages.

Technological improvement and development stage

Late 20th century: With the development of industry and the improvement of steel pipe quality requirements, the production technology of SSAW steel pipes has been continuously improved. Advanced technologies such as low residual stress forming and pipe end mechanical diameter expansion have begun to be adopted. The quality of spiral welded pipes that have undergone strict quality control has been significantly improved and is comparable to straight seam welded pipes. It is gradually being used in oil and gas long-distance pipeline projects. Increase.

Early 21st century: In major long-distance oil and gas pipeline projects such as China's "West-East Gas Pipeline", SSAW steel pipes have been widely used, promoting the further development and improvement of its production technology. In terms of welding technology, the automatic double-wire double-sided submerged arc welding process has been promoted and applied, improving welding efficiency and quality; in terms of quality testing, the use of advanced testing equipment such as online continuous ultrasonic automatic flaw detectors ensures that the spiral welds are non-destructive Detection coverage enables timely discovery and elimination of defects.

Mature and widely used stage

In recent years, SSAW steel pipes have reached a high level in terms of production technology, equipment automation, and product quality control, and have been widely used in domestic and foreign markets. In addition to the field of oil and gas transportation, it is also widely used in pipeline construction in urban gas, heat, water supply and drainage, chemical industry, electric power and other industries. Internationally, although the United States, Japan and Germany generally do not agree with the use of SSAW in trunk pipelines, countries such as Canada and Italy still use it in some cases, and Russia also uses it in small quantities and has formulated strict supplementary conditions.