The blanks used in welded steel pipes are steel plates or strips. Due to their different welding processes, they are divided into furnace-welded pipes, electric-welded (resistance-welded) pipes, and automatic arc-welded pipes. Because of their different welding forms, they are divided into two types: straight seam welded pipes and spiral welded pipes. Because of their end shapes, they are divided into round welded pipes and special-shaped (square, flat, etc.) welded pipes. Welded pipes are divided into the following varieties due to their different materials and uses:
1. GB/T3091-1993 (galvanized welded steel pipe for low-pressure fluid transportation). It is mainly used to transport water, gas, air, oil, heating hot water or steam, and other general lower-pressure fluids and other pipes. Its representative material is Q235A grade steel.
2. GB/T3092-1993 (galvanized welded steel pipe for low-pressure fluid transportation). Mainly used to transport water, gas, air, oil, heating hot water or steam, and other general lower-pressure fluids and other pipes. Its representative material is Q235A grade steel.
3. GB/T14291-1992 (Welded steel pipe for mining fluid transportation). It is mainly used for straight seam welded steel pipes for mine air pressure, drainage, and shaft gas discharge. Its representative materials are Q235A and B-grade steel. GB/T14980-1994 (Large-diameter electric welded steel pipe for low-pressure fluid transportation). Mainly used for transporting low-pressure fluids such as water, sewage, gas, air, heating steam, and other purposes. Its representative material is Q235A grade steel.
4. GB/T12770-1991 (Stainless steel welded steel pipes for mechanical structures). Mainly used in machinery, automobiles, bicycles, furniture, hotel and restaurant decoration, and other mechanical parts and structural parts. Its representative materials include 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, etc.
5. GB/T12771-1991 (Stainless steel welded steel pipes for fluid transportation). Mainly used to transport low-pressure corrosive media. Representative materials are 0Cr13, 0Cr19Ni9, 00Cr19Ni11, 00Cr17, 0Cr18Ni11Nb, 0017Cr17Ni14Mo2, etc.
Post time: Oct-16-2023