... , st37-2, SS400, ASTM.A53, 20#, ect.StandardGB3094, GB/T 6728,GB/T 178, ASTM A53,ASTM A500 ,EN10210, EN10219, ect.CoatingOiled ... any reliable partner in the world , any questions pls don't hesitate to contact me by skype : yinyin6340 or email : yinyin6340 ... ( dot ) com waiting for your kindly reply . Thanks DIN EN 10210 square steel pipe