... ,10*20-300*500mm 3)material:Q195 Q235 4)Standard: ASTM BS GB DIN SizeWall thickness (W.T.)15mm*15mm-1000mm ... -20mmLength5.8m-12m ,by customer’s requirementsInternational StandardISO 9001-2008StandardsASTM A53,BS1387-1985,GB/T3091-2001,GB/T13793-92, GB/T6728 ... -635-2128822 Fax:86-635-2128822Mobile phone:86-15954587083Skype:cherryhuang880104 astm a53 carbon square steel pipe/tube