42CrMo4 cold drawn seamless rectangular tube

The primary reason for rusting of thick walled square tubes is the zinc coating on the surface. Zinc has more active chemical properties, soluble in acids and alkalis. In humid environments, zinc will react chemically and form a basic zinc carbonate film on the surface. When it comes into contact with substances containing hydrogen sulfide, the corrosion resistance of zinc decreases, making it easy to corrode and then exposing the surface of the steel plate, ultimately rusting. The probability of rust on galvanized strip steel using electroplating method is relatively low, because the electroplating coating is relatively thick and not easy to form oxidation of the steel plate, so it is not easy to rust 42CrMo4 cold drawn seamless rectangular tube，rectangle metal tubing，galvanized rectangular tube，structural steel square tube Mechanical parts: Square tubes can also be used to manufacture various mechanical parts, such as the frame, chassis, suspension system, etc. of cars,…