... 3thickness:1.5mm--22.0mm 4standards:GB6728-2002,JIS3466,JIS4360,DIN10219,ASTM A500 steel pipemetal structural pipesize:30*30mm-450*450mmthickness ... :1.5mm--22.0mmstandards:GB6728-2002,JIS3466,JIS4360,DIN10219,ASTM A500 Metal structural pipe is one of our leading ...