Hot Rolled ASTM 106 black carbon Iron seamless steel pipe Carbon steel pipe, Petroleum casing pipe, Fluid pipe, structure pipe, Alloy steel pipe 2. Specification: OD:21.3-610MM, WT:5.5-100mm Length: 1-12m, or as clients requirement 3.Standard: API 5L,API 5CT,ASTM A106,ASTM A53, GB/T8162,GB/T8163,GB/T5310,GB/T3087,GB18248 4.Steel Grade: GrA,GrB,X42-X70,Q345B,ST37,ST37.2,10#,20#,J5,K55,N80,L80,T95,C95,P110,Q125 5. Surface Treatment: Galvanized, anti-rust coating, black painting, etc 6. Package: 1) In bundle with steel strips; 2) By plastic bag then strips; 3) As client' requirements