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Seamless Steel Pipe API 5L Astm A53 A106 With Black Coating Bevelled End And OD1/2'-48 BOYUE GROUP:Material:Q235, 20#, Q345 A53B, A106B, API 5L ST37.0,ST35.8,St37.2,St35.4/8,St42,St45,St52,St52.4 STP ...