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ERW steel pipes/tubes Product specifications Standard GB/T 8162—2008 ASTM106Gr.B ASTM A53Gr.B Material 10#,20#,35#,45#,16MN, Q295,ASTM A106 GR.A or B Diameter 2-1/2" - 18"(73 - 457mm) Thickness 5-14mm ...