Welded steel pipe, also known as welded pipe, is a steel pipe made by welding after the steel plate or strip is curled and formed. Generally, the fixed length is 6 meters. The production process of welded steel pipe is simple, the production efficiency is high, there are many varieties and specifications, and the equipment investment is small, but the general strength is lower than that of seamless steel pipe.

Commonly used materials:

Q235A, Q235C, Q235B, 16Mn, No. 20, Q345, L245, L290, X42, X46, X60, X80, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, etc.

Implementation standards:

GB/T3091-2008, Welded steel pipe for low-pressure fluid transportation: mainly used for transporting water, gas, air, oil and heating hot water or steam and other generally lower pressure fluids and other purpose pipes. Its representative material is: Q235A grade steel.

GB/T14291-2006, Welded steel pipe for fluid transportation in mines: mainly used for straight seam welded steel pipes for mine compressed air, drainage, and axial gas drainage. Its representative materials are Q235A and B grade steels.

GB/T12770-2002, Stainless steel welded pipe for mechanical structure: mainly used for machinery, automobiles, bicycles, furniture, hotels and restaurants decoration and other mechanical parts and structural parts. Its representative materials are 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, etc.