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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
  • Prevention of horizontal cracking measures
    Oct 29, 2018

    1. Improve the quality of billet heating

    (1) Strictly heat according to the process requirements, and use the upper limit temperature to heat, to prevent low temperature heating. For example, the heating temperature of carbon steel (1胪~45.) billet is 20~30°C higher than the original process, and the effect is better. According to statistics, the gap in the next five months fell by nearly 40%.

    (2) For the inclined bottom furnace, the material should be diligently placed to make the billet heat evenly, and the appearance of the yin and yang surface is eliminated. At the same time, after the material is finished, the furnace door is closed to reduce heat loss.

    (3) Strictly control the rolling rhythm to ensure that the billet is heated and penetrated without blackening. Avoid the phenomenon of perforated black spirals.

    (4) Use high quality heavy oil to ensure the heating quality of the billet.


    2. Improve capillary wall thickness accuracy

    (1) Correctly adjust the perforation and rolling process parameters, improve the precision of the work rolls such as rolls, and make the blanks and waste pipes deform evenly during the piercing and rolling process.

    (2) Accurately adjust the centering position and install a roller device so that the head can be aligned with the center of the blank to avoid eccentricity of the hole.

    (3) Install and adjust the holding roller, hold the ejector pin tightly to prevent the ejector from sinking.

    (4) Carry out the equipment repair system to keep the equipment in good condition and ensure the wall thickness accuracy of the capillary tube.

    (5) Strengthen management, often measure the wall thickness of the capillary tube, and find problems in time to adjust.