... 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 team6 ... and produce under customer's requirements)9), Good market reputation for all kinds of steel structure buildling. steel structure steel pipe truss for various ...