Hot Galvanized Round Steel Pipe Used for Fluid Pipe, Boiler Pipe, Drill Pipe

Welded steel pipe, also known as welded pipe, is made of steel plate or strip after crimping forming welded steel pipe, general length 6 meters. Welded steel pipe production process is simple, high production efficiency, variety of specifications, less investment in equipment, but the general strength is lower than seamless stee

Since the 1930s, with the rapid development of high quality strip rolling production and the progress of welding and inspection technology, the quality of weld is constantly improving, the variety and specifications of welded steel pipe are increasing day by day, and replaced seamless steel pipe in more and more fields. Welded steel pipe is divided into straight seam welded pipe and spiral welded pipe according to the form of weld. Classification by production method: Process classification - arc welding pipe, resistance welding pipe, (high frequency, low frequency) gas welding pipe, furnace welding pipe.

Direct seam welding is used for smaller diameter welded pipes, while spiral welding is used for larger diameter welded pipes. According to the shape of the steel pipe end, it is divided into circular welded pipe and special-shaped (square, rectangular, etc.) welded pipe; According to the different materials and uses, it can be divided into welding steel pipe for mineral fluid transportation, galvanized steel pipe for low pressure fluid transportation, electric welding steel pipe for belt conveyor roller, etc. According to the current gb specification size table, according to the outer diameter * wall thickness from small to large order.

Product standards

The common materials of welded pipe are: Q235A, Q235C, Q235B, 16Mn, 20#, Q345, L245, L290, X42, X46, X60, X80, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb and so on.

The blank used for welding steel pipe is steel plate or strip steel, which is divided into furnace welding pipe, electric welding (resistance welding) pipe and automatic arc welding pipe because of the different welding process. Because of its different welding form is divided into straight seam welding pipe and spiral welding pipe two kinds. Because of its end shape is divided into circular welded pipe and shaped (square, flat, etc.) welded pipe. The welded pipe is divided into several varieties as follows because of its different materials and uses:

GB/T3091-2008 (welded steel pipe for low pressure fluid transportation) : mainly used for conveying water, gas, air, oil, heating hot water or steam and other general low pressure fluids and other purposes. Its representative material is: Q235A steel.

GB/T14291-2006 (welded steel pipe for mineral fluid transportation) : mainly used for straight seam welded steel pipe for mine air pressure, drainage and shaft gas discharge. Its representative material Q235A, B grade steel.

GB/T12770-2002 (welded stainless steel pipe for mechanical structure) : mainly used in machinery, automobile, bicycle, furniture, hotel and restaurant decoration and other mechanical parts and structural parts. Its representative material 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb and so on.

GB/T12771-1991 (welded stainless steel pipe for fluid transportation) : mainly used for conveying low-pressure corrosive media. The materials are 0Cr13, 0Cr19Ni9, 00Cr19Ni11, 00Cr17, 0Cr18Ni11Nb, 0017Cr17Ni14Mo2, etc.

In addition, welded stainless steel pipe for decoration (GB/T 18705-2002), welded stainless steel pipe for architectural decoration (JG/T 3030-1995), and welded steel pipe for heat exchanger (YB4103-2000).

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