... grid 3.Modular installment 4.Safe operation >20 years Substation steel structure 1.ISO9001:20082.Support smart grid3.Modular installment4.Safe operation ... steel), Q345(high tensile steel),Q360 to replace the equivalent material of ASTM A-36, ASTM A-572, S355,etc.2. Our design ... , dimension check, wielding inspection, zinc coating inspection, prototype, etc. Substation steel structure