Surface hardening is performed for the hardness requirements of the surface. There are few design references for the plasticity and toughness requirements of hydraulic steel gate materials. Considering that the hydraulic steel gate opening and closing is not as frequent as the crane operation in industrial buildings, the gate track is under water work, and it is very inconvenient to overhaul and replace. And large steel gates are generally used for major water conservancy and hydropower projects with high reliability requirements. The plasticity and toughness performance index of the track material is not less than the requirements of the steel crane beam, and the elongation and impact toughness are guaranteed. When the steel gate is opened and closed, a large friction is generated on the contact surface between the rail and the roller. To ensure the durability of the rail, the contact surface of the rail and the roller is required to have high wear resistance. Increasing the hardness of materials is an important measure to improve the wear resistance of materials. Generally, the hardness is increased, the wear resistance is increased, the strength is also increased, but the plasticity and toughness are lowered. The loads on the rollers and tracks of large hydraulic gates have dynamic load characteristics. The materials selected and the heat treatment process should ensure that the materials have both high strength and sufficient toughness. The section size of the steel gate track of large-scale water conservancy and hydropower engineering is large, and the influence of the section size on the mechanical properties of the material must be considered during design. Generally, the hardness value of the track material after quenching and tempering is less than the requirements of Table 2. For example, the cross-sectional profile size of the accident gate track of the Three Gorges Water Conservancy Project is 380mm@380mm, which is made of ZG42CrMo steel. (Finish)
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