... Chinese national standard Application:General seamless steel tubes for conveying fluids productionSteel pipetypeSeamless and ERWsize1/2" ... beveled EndSurface treadmentBlack painting , Anti-rust varnish, Anti-rust oil , Hot-galvanized , Cold galvanized ,3PE, EPOXY coating, ... medical drug use power, metallurgy,, oil drilling, boilers and pressure vessel of medium and low pressure(normally the container ...