Erw steel pipe outside diameter: 21.3 to 610mm (1/2-24 inch) Erw steel pipe standard: api 5l, api 5ct, astm a53, astm a252, astm a500, bs1387 Erw steel pipe grade: a, b, x42, x46, x52, x56, x60, x65 x70 psl1 psl2 Erw steel pipe thickness: sch 20 to sch 140mm (2-14 inch) Erw steel pipe packing: labeled and bundled together with steel strip Type of erw steel pipe finish: black paint on pipe, beveled or plain end with plastic cap. Erw steel pipe application: line pipe in oil and sewage transportation, in low pressure liquid and gassy transportation, good structure steel pipes, used in building and bridge fields