LSAW Steel Pipe

Carbon structural steel pipe is a seamless pipe that does not contain other alloying elements except for carbon (C) elements and a certain amount of silicon (Si) (generally not exceeding 0.40%) and manganese (Mn) alloying elements for deoxidation. . Such steels must guarantee both chemical composition and mechanical properties. The content of impurity elements such as sulfur (S) and phosphorus (P) is generally controlled below 0.035%. Structural seamless pipe pickling In addition to stripping the iron oxide scale during pickling, hydrogen also diffuses into the carbon structural steel pipe matrix and gathers at impurities or pores. It leads to an increase in internal stress, reduces the plasticity of carbon structural steel pipes, and increases the brittleness of carbon structural steel pipes. This effect is called hydrogen embrittlement. Hydrogen embrittlement is mainly affected by the diffusion rate of hydrogen atoms. The diffusion rate of hydrogen is related to the following factors...

What is non-destructive testing? Non-destructive testing, referred to as NDT, is a modern inspection technology that detects the shape, position, size and development trend of internal or external defects without damaging the object to be inspected. It has been widely used in steel pipe production in recent years. The non-destructive testing methods used in the production of seamless pipes & tubes mainly include magnetic particle testing, ultrasonic testing,radiographic testing, eddy current testing, penetrant testing, etc., and various testing methods have a certain range of application. 1. Magnetic Particle Testing Apply magnetic powder on the surface of the seamless pipe to be tested, apply a magnetic field or current to make it enter the defect, form a magnetic charge distribution, and then observe the deposition of the magnetic powder to detect the defect. 2. Ultrasonic testing Using the characteristics of ultrasonic propagation in materials, by transmitting and receiving ultr...