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  • Shaanxi Tonghui Steel Co., Ltd.

  • E-mail: sxthsteel@sxth-group.com

  • Tel: +86-29-89636557

  • Add: 1st Building Of Jinqiao International, Xi'an, Shaanxi,China

  • Distinction between annealed and non annealed stainless steel welded pipe
    Aug 24, 2018

    1, pipes can be judged by echo. Knock on each tube and listen to the echoes at the mouth of the tube. If the echo is higher and sharper, it has been annealed. Because the crystal structure of the annealed parts is more uniform and denser, the echo with higher pitch can be produced. Unannealed parts have more defects and can absorb part of the acoustic energy, so they have lower tone at the nozzle and become stuffy. Sonar can be used to detect if conditions are available.

    2, use a good digital multimeter to measure the resistance per unit length (such as 2 meters) of each branch. The resistance of stainless steel is large and should be measured. The resistance of annealed steel parts is smaller than that without annealing. Dry before testing, no liquid.


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