What is spiral welded steel pipe?

Spiral welded steel pipe refers to the steel or steel plate bending deformation of circular, square and other shapes and then welded into the surface of the seam with the steel pipe. According to the welding method can be divided into different arc welding pipe, high frequency or low frequency resistance welded pipe, gas pipe, furnace pipe, Bundy tube. According to the shape of the weld can be divided into straight seam welded pipe and spiral welded pipe. Welded steel pipe for oil drilling and machinery manufacturing industry. Furnace welded pipe can be used as water and gas pipes, large diameter straight seam welded pipe for high pressure oil and gas transportation; spiral welded pipe for oil and gas transportation, pipe piles, piers and so on. Welded steel pipe is less costly than seamless steel pipe and has high production efficiency.

One spiral welded pipe production process is simple, high production efficiency, low cost, the development of faster. The strength of the spiral welded pipe is generally higher than that of the straight seam welded pipe, and the pipe with larger diameter can produce pipe with larger diameter. The same width of the blank can also produce different pipe diameter. However, compared with the same length of the straight pipe, the weld length increased by 30 to 100%, and the production rate is low. Therefore, the smaller diameter of the pipe are mostly used straight seam welding, large diameter welded pipe are mostly used spiral welding.
Common material: Q235A, Q23b, 0Cr13,1Cr17,00Cr19Ni11,1Cr18Ni9,0Cr18Ni11Nb. Q345 L245 L290 X42 X46 X70 X80

Standard: GB / T9711.1-1997 (GB, also known as oil and gas industry, delivery of steel pipe delivery technical conditions of the first part: A-class steel pipe (to the current requirements of a strict GB / T9711.2 B-class steel pipe)), API-5L (American Petroleum Institute, also known as pipeline steel pipe; which is divided into PSL1 and PSL2 two levels), SY / T5040-92 (pile with spiral submerged arc welded pipe).

Abstract from Tianjin Xinyue Steel Group