ASTM B423 Alloy Steel Pipe Supplier: ASTM B423 UNS N08825, N08221, N06845 Steel Pipes, Seamless, OD 1/8-30IN, WT SCH 5S, 10S, 40S, 80S, Cold, Hot Finish. Product: ASTM B423 Alloy Steel Pipe. Grades: UNS N08825, N08221, and N06845. Outer Diameter: NPS 1/8-30IN. Wall Thickness: SCH 5S, 10S, 40S, 80S. Manufacturing: cold and hot finish. Application: Used for general corrosive service.