... :A53,A106,API 5L Gr.B 3.Size:1/2-20inch ASTM A53/A106/API 5L Gr.b seamless steel pipe Product Introduction ... : 1. Kind: carbon steel seamless pipe 2. Size: Diameter: 1 ... inch Thickness: 2mm-60mm 3. Steel Grade:A53 (A,B),A106(A,B),API 5L Gr.B,X42,X52,X60,st42,st37 ...