Material ASTM a106/a53, API 5L, ASTM a192, DIN17175 st35.8 /37, DIN1629 st52, ASTM a210, ASTM a335, ASTM a179. Carbon steel /alloy steel, 1/2 inch-24 inch, sch 20/40/80/120/160/xxs Surface oiled or black painted in order to prevent rust or galvanized
