Galvanized pipes are divided into hot-dip galvanized and cold-galvanized. The galvanized layer of hot-dip galvanized is thick, which has the advantages of uniform coating, strong adhesion and long service life. Corrosion resistance is much worse than hot dip galvanized pipe.

Seamless black steel pipes are widely used in high-pressure, low-temperature, corrosion-resistant environmental piping systems. Mechanical properties, technological properties and corrosion resistance are three important indicators to measure the quality of steel pipes, and are also important guarantees for the safe navigation of ships. So how to ensure the quality of seamless black steel pipe?

Stainless steel seamless pipe is a long strip of steel with a hollow section and no joints around it. It is a kind of steel pipe that is resistant to weak corrosive media such as air, steam and water and chemical corrosive media such as acid, alkali and salt.However, in long-term use, stainless steel seamless pipe is prone to scale.

In order to improve the product quality of seamless pipes and eliminate spots, surface degreasing and cleaning processes are required. The components and properties of lubricants are very important for surface degreasing and cleaning.

Now due to the development of science and technology, the ordinary quenching technology of cold drawn seamless tubing has been upgraded to high-frequency quenching technology. At present, high-frequency quenching technology has been widely used.

In the whole process of welding production, 35crmo welded pipe can easily show many situations such as missing welding and misalignment. But in this case, it is more difficult to grasp the trachoma at the butt weld of the 35crmo welded pipe.