1.ISO9001 Certificate 2.Material of steel : Q195-Q235 3.Own physical and chemical laboratoies 4.Type of steel :channel steel Dear Friends,This is Daisy,from Tangshan Qishuo Import & Export Trade Co.,Ltd.Our company has worked about 10years,and our customer spread all over the world.The following is our quality index,please check it.If you have some questions,then you can ask me for free.JIS ...