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ASTM A 106 Black Carbon Seamless Steel Tubes mo le tele o auaunaga maualuga maualuga
I Botop, ua faʻamamaluina i matou e avea ma lala faʻavaomalo o Hebei allland Steel Tube Group, ma matou te faʻaputuina foi le tele o paipa uʻamea faʻafefe e fetaui ma manaʻoga o tagata faʻatau....Faitau atili