... , Panel style, poatin design, custom make colors Tower crane mast section S24,L46A1, L68B2,H20,HD23Panel style design, Hi-Q ... one platform for free.Main material of steel structure adopts high grade. Most of them are Q3458 and Q345CThe surface of ... heat-treatment technique and surface galvanized process.The pin of mast section adopted sulphocarbonitriding technology and resin heat-treatment technique, ...