knowledge about spiral welded and Straight seam welded steel pipes

Spiral steel pipes are made by steel coil, extrusion forming under the normal temperature, then taken the technology of double wire and double-faced submerged-arc welded.

During molding process of spiral welded steel pipe, steel plate has uniform deformation and light residual stress, thus the surface has no scratches. Spiral steel pipe has more flexible thicknesses and diameters, especially in making high-grade thick pipes with small or medium aperture, these techniques has incomparable advantages in satisfying your needs.

Straight seam welded pipe has simple production process, high production efficiency, low cost and rapid development. The strength of the spiral welded pipe is generally higher than that of the straight welded pipe. It is possible to produce a welded pipe with a large diameter by using a narrow blank, and it is also possible to produce a welded pipe having a different pipe diameter by using a blank of the same width. However, compared with the straight pipe of the same length, the weld length is increased by 30 to 100%, and the production speed is low. Therefore, most of the smaller diameter welded pipes are straight seam welded, and the large diameter welded pipes are mostly spiral welded.

Common material

Q235A, Q23b, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb. Q345 L245 L290 X42 X46 X70 X80

standard:

GB/T 9711-2011 (national standard, also called oil and gas industry, delivery steel pipe delivery technical conditions, the first part: A-grade steel pipe (to the current strict requirements have GB/T9711.2 B-grade steel pipe)), API-5L (US oil Association, also called pipeline steel pipe; which is divided into two grades of PSL1 and PSL2), SY/T5040-92 (spiral submerged arc welded steel pipe for pile)

good stocks

ERW/EFW Pipe

Api Carbon Steel Pipe

Smls Line Pipe

Saw Line Pipe

A335 P22 Steel Pipe

304l Steel Pipe