1steel raw Material Grade Q235, equivalent to ASTM A36. Grade Q345, equivalent to ASTM A572. 2Standard: GB50221-2001,ASTM,DIN EACH METAL is Factory direct provider of all kinds of steel structure buildings and material plant . We specialize in design ,fabricate construction ,install and related tecnology guide.Our competitive price and high quality have got customers from all over the word. 1. ...