... natural gas industries.Stainless Steel: ASTM A 312, A 213, A 249, A 269, A 358, A 240Carbon Steel: ASTM A 335, GR P1, P2, P5 ... both and natural gas industries etc. Casing: Casing is a large-diameter pipe that serves as the structural retainer ... gas wells, or well bore. It is inserted into a well bore and cemented in place to protect both ... us with details of your specific orders. ASTM A 249 oil pipe