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I-ASTM A 106 Black Carbon Seamless Steel Tubes kwiintlobo ngeentlobo zezicelo zenkonzo yobushushu obuphezulu
E-Botop, sinelunda ngokuba lisebe lamazwe ngamazwe le-Hebei allland Steel Tube Group, kwaye sikwagcina uluhlu olubanzi lweetyhubhu zentsimbi ezingenamthungo ukuhlangabezana neemfuno zabathengi....Funda ngokugqithisileyo