1.Specfication Of Seamless Steel Pipe: 1) Sizes Of Seamless Steel Pipe: 1/4'' To 24'' 2) Standards Of Seamless Steel Pipe: ASTM A53 Gr.B, A106Gr.B, API5LB, X42 3) Surface Of Seamless Steel Pipe: Oiled Or Black Painted To Prevent R ...Read More