Commonly used materials for welded pipe

　　Commonly used materials for welded pipe: Q235C Q235B, Q235A, 16Mn, 20#, Q345, etc. Welded pipe due to its different materials and usage, are divided into the following several standard: GB/T3091-2008 (low pressure fluid transport welded steel pipe). Mainly used for conveying water, gas, air, oil and heating hot water or steam and other generally low pressure fluid and other use pipe. Its representative material is: Q235A. GB/T14291-2006 (mineral fluid transport welded steel pipe). Mainly used in mine air pressure, drainage, gas drainage shaft with a straight seam welded steel pipe. Its representative material Q235A and Q234B.

　　production process

　　ERW production has the advantages of simple process, high production efficiency, low cost, rapid development. Strength of spiral welded pipe is usually better than straight seam welded pipe is high, can use a narrow diameter of billet production larger pipe can also differ with the same width of the billet production diameter pipe. Pipe process raw material uncoiling, leveling, end cutting and welding, looper, forming, welding - both inside and outside the weld bead removal -- pre correction - induction heat treatment, size and alignment: eddy current testing - cut -- check the water pressure, pickling, final inspection (strictly) -- packing, shipment.(welding neck flange stainless steel)