In order to improve the durability and corrosion resistance of seamless steel pipes, anti-corrosion treatment is usually carried out during the production process. One common treatment method is hot-dip galvanizing or spraying anti-corrosion coatings. When the sprayed coating is black or contains black components, the surface of the steel pipe will appear darker. This anti-corrosion treatment not only enhances the durability of steel pipes, but also provides better protection in high temperature, humid or corrosive environments.