Daisy Dai

The large-diameter seamless steel tube is characterized by a large diameter and a relatively thick wall thickness. Therefore, according to this feature, the combination of ultrasonic detection inside...

China's straight seam welded pipe industry started in the 1950s and started late. The production process and technology are quite different from those in developed countries. Most of the enterprises...

The so-called high frequency is relative to the frequency of the alternating current of 50 Hz, and generally refers to a high frequency current of 50 kHz to 400 kHz. When high-frequency currents pass...

The degree of deformation is related to the selected extrusion ratio.Reducing the die hole diameter or increasing the diameter of the extrusion tube can increase the extrusion ratio, thereby...

High-speed seamless steel pipe are high-carbon, high-alloy cold-work die. When heated at the conventional quenching temperature, due to the dissolution of alloy carbides, the content of carbon and...

Surface contaminationAfter hot-dip galvanizing the substrate, some of the coating has a small surface defects, rough look like embedded in the coating of dross particles, under the scanning electron...

The segments open until all the segments touch the inner wall of the steel tube. The steel pipe was initially rounded. The position of the past segment of the segment begins to decrease the speed of...

1.The method of production of seamless steel tubing, which is roughly divided into slant rolling (mannesmann method) and extrusion method.The slant rolling (mannesmann method) is the first to use a...

The stress corrosion of welded steel pipe can only occur under certain circumstances, and it also has the following characteristics:(1) Stress corrosion cracking can occur only when there is stress...

Process weldability of stainless steel tube refers to the ability to obtain high quality, non-defective welded joints under certain welding conditions. For the welding, the welding process generally...