American Standard SCH 80 wall thickness steel pipe is a seamless pipe that conforms to American standards (such as ASTM A53/A106, etc.). SCH 80 represents a specific wall thickness series designation, belonging to the category of thickened pipes (usually corresponding to the letter XS). The actual wall thickness of this type of steel pipe is not a fixed value, but varies depending on the nominal diameter (DN) of the pipe; for example, for a 3-inch (3") steel pipe with a nomin...