... , SCH40,SCH80 ......XXS Quality StandardASTM A 53 Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and SeamlessASTM ... pipesSteel GradeASTM A 53: Grade A, Grade B, Grade C, Type F, Type EASTM A519: 1010-1045, 4130-4142, 5135GB/T8162: 10 ... Certificate: EN 10204/3.1BThank youThreeway Steel Carbon Seamless Steel Pipe