The advantages of Q460ND normalizing rolling performance over hot rolling process are mainly reflected in the following aspects:

1. Grain refinement: During the normalizing rolling process, the steel billet is rolled at high temperature, and then by controlling the cooling rate, the steel plate retains fine grains at room temperature. This fine grain structure helps to improve the strength and toughness of the steel, making the comprehensive performance of Q460ND steel plate superior.

2. Defect elimination: During the normalizing rolling process, the steel billet is rolled at high temperature, which allows defects such as blowholes and porosity in the steel to be welded shut, thereby improving the mechanical properties and durability of the steel plate.

3. Microstructure improvement: During the normalizing rolling process, the steel billet is rolled at high temperature, which improves the microstructure of the steel, thereby enhancing the mechanical properties and service life of the steel plate.

4. Energy saving: The normalizing rolling process does not require heating the steel billet to high temperature and then cooling it; instead, rolling is performed directly at high temperature, and then by controlling the cooling rate, the steel plate retains fine grains at room temperature. This process saves energy and improves production efficiency.

5. Increased production efficiency: The normalizing rolling process eliminates the need for complex heat treatment processes, as the desired properties are achieved directly during rolling, thereby improving production efficiency.

6. Reduced environmental pollution: The normalizing rolling process does not require complex heat treatment processes, thus reducing environmental pollution.

Overall, the advantages of Q460ND normalizing rolling performance over the hot rolling process lie in its ability to directly achieve a fine grain structure during rolling, improve the strength and toughness of the steel, while saving energy, increasing production efficiency, and reducing environmental pollution.