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  • Cangzhou Steel Pipe Group (CSPG) Co., Ltd.
  • ADD:No.92 Jiefang East Rd., Cangzhou City, Hebei Province, China
  • TEL:+86-31-75673271
  • MOBILE:+8615373302068
  • E-MAIL:ella@cnspipe.com
  • Metallurgical properties of materials
    Oct 29, 2018

    Straight seam submerged arc welded pipes are produced from steel plates, and spiral welded pipes are produced from hot rolled coils. The hot rolling strip unit rolling process has a series of advantages, and has the metallurgical process capability for producing high quality pipeline steel. For example, a water cooling system is installed on the output gantry to accelerate cooling, which allows the use of low alloying compositions to achieve special strength levels and low temperature toughness, thereby improving the weldability of the steel. But this system is basically not available in steel plate production plants. The alloy content (carbon equivalent) of the coiled sheet is often lower than that of similar grades, which also improves the weldability of the spiral welded pipe.

    It should be further noted that since the coil rolling direction of the spiral welded pipe is not the direction of the vertical steel pipe axis (the pinching depends on the helix angle of the steel pipe), the rolling direction of the straight steel pipe is perpendicular to the axial direction of the steel pipe, and thus, the spiral The crack resistance of the welded pipe material is superior to that of the straight seam steel pipe.