Hot rolled welded pipe refers to steel pipes made by welding hot-rolled steel strips or coils after curling and forming. Its production standards usually include national standard GB/T3091-2008, British standard BS1387-1985, American standard ASTM A53, European standard EN10219/2001, and API 5L; Common materials include Q195, Q235, Q275, Q355, S235JR, S275JR, S355JR, etc; Quality grades can be divided into A, B, C, and D. Since the 1930s, with the rapid development of high-quality strip steel rolling production and the advancement of welding and inspection technology, the quality of welds has been continuously improved. The variety and specifications of welded steel pipes have been increasing, and they have replaced seamless steel pipes in more and more fields. They can not only be used directly, but also further processed, such as cutting, bending, flattening, beveling, grooving, threading, punching, welding, reducing diameter, painting, spraying, galvanizing, etc. They have a wide range of applications and strong plasticity, and are widely used in various fields.
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