Electro-static powder coationg steel pipe is to spray the powder paint  to the pipe through electro-static processing and to roast for some time to form coating.Electro-static spraying equipment----electro-static plastic spraying machine is used to spray the powder paint to the workpiece surface.Under the efect of static,the powder will be adsorbed onto the workpiece surface.Thus powder coating is formed.Through flowing and solidifying under high temperature,the powder coating will become different finial coating.The impression of powder coating is superior than paint to spraying in the mechanical intensity,adhesive power,anticorrosion and aging resistance etc,Also the cost is lower than paint-spraying.