... 1), Comply with GB, ASTM... ISO9000; 2), Exquisite surface; 3), Steady structure; 4), Low cost, high benefit 1), Comply with GB, ... ASTM,....ISO9000;2), Exquisite surface;3), Steady structure;4), Low cost, high benefit.5), Excellent design ... requirements)9), Good market reputation for all kinds of steel structure buildling. steel structure steel pipe truss for various construction