... C at sight Species of the alloly steel plate: HSLA/ High Strength Low Alloy Steel Plate: 1>. Standard: ASTM Grade: A572 ... >. GB Q235qC, Q345qC (16Mnq), Q370qC, Q420qC Building Structural Steel Plate:GB Q235GJC, Q345GJC, Q390GJC, Q420GJC, Q460GJCDetails of the desingnation ... the yield point;GB/T1591-94Used for engineering machinery, steel structure, Bridges, buildings, etc, and has good strength, ...