The quenching stress at room temperature and the quenching stress at zero are superimposed, and cold treatment cracks are formed when the stack response force exceeds the strength limit of the material.

The color of the precision tube becomes unsightly after rust. These methods can solve this problem.

Some rules must be followed when storing seamless steel pipes

The pipe jacking method to produce seamless steel pipes was proposed by Heinrich Erhard of Germany in 1892.

In order to complete the construction safely and quickly, it is essential to calculate the pressure of the seamless pipe, especially the calculation of the internal pressure.

When the directionally emitted ultrasonic beam encounters defects when propagating in the tube, it will produce wave reflection and wave attenuation. After the defect reflection wave is picked up by the probe, the flaw detector processes the defect echo signal and gives a quantitative Defect indication.