... :DINEN 10210,DIN EN 10219,ASTMA500,GB/T 3094-2000,GB/T 6728-2002,GB/T178-2005,JISG3466,ASTM-A53.BS1387 ... ,JIS-G3444,GB/T3091-2001(2)Material: 20#,Q195,Q235,Q345 ... estalbish long term business with any relaible partner in the world . any interesting or quesitons pls don't hesitate ... ) com .waiting for your kindly rely . thanks Q195/ Q235B /Q 345 Black Square Pipe /Square pipe