... ) L:2~11.8m 4) Material:Q195,Q cold forming square pipe 1.size:10*10mm-600*600mm2.thickness:0.5mm-60mm4 ... , ASTM A363.length:2~11.8m4. High Quality: ISO900:2000, API5L, API5CL Product square steel pipesStandardGB/T3091-2001,BS1387,ASTM A53 ... RemarkWe have professional testing equipment such as ultrasonic testing machine, eddy current testing machine,Mechanics testing machine to make sure high quality.