API 5L screw steel pipe 1) ASTM A53 2) ASTM A106 3) API 5L 4)API 5CT API 5L screw steel pipe We promises:reasonable prices and lead time,satisfactory after-sales serviceAPI 5L screw steel pipeGrades:1>J55,K55,N80,P110,L802>ASTM A106 GR.A ,A106 Gr.B,A53 Gr.A,A53 Gr.B,ASTM A179-C,A214-C,A192,A226,A315-B,A178-C,A210-A-13>STFA410,STB340,STB410,STPG370STPG38,STPG410STPG42,STPT370,STPT410,STS38,STB30, ...