... -Sch160,XXS,XS,STD Standard: . ANSI. JIS. DIN, Piping steel ;15NiGrMoNb5 alloy steel pipe Size1/2"-24Wall thicknessSch10-Sch160XXSXSSTDStandardAPI,ASME, B36.10M 1996 ... 5L GRB/ API 5 CT/ Q345/ A335/ ST37/ ST52Packagingpipe cap, steel strips bundledSurface treatmentblack rust-proof oil, transparent oil, hot galvanizing ...