Standard: ANSI B16.9 / 16.28, ASTM A53/A106, API 5L, ASME B36.10M---1996, DIN2605 / 2615 / 2616, JIS P2311/2312

Thickness: SGP, STD, SCH40, SCH80, SCH160. XS, XXS and so on.

Size: 1/2"--60"

Material: Carbon steel , alloy steel, stainless steel

Surface treatment: Transparent oil, rust-proof black oil or hot galvanized.