It is important to note that the specific usage areas and industries that utilize S235J0 and DX51 structural steel grades may vary. However, here are some industries that commonly use structural steel grades:
1. Construction industry: Structural steel is widely used in the construction of buildings, bridges, and infrastructure projects.
2. Automotive industry: Structural steel is used in the manufacturing of car frames, chassis, and other components.
3. Shipbuilding industry: Structural steel is used in the construction of ships and other marine vessels.
4. Energy industry: Structural steel is used in the construction of power plants, oil rigs, and other energy-related structures.
5. Manufacturing industry: Structural steel is used in the manufacturing of machinery and equipment.
6. Mining industry: Structural steel is used in the construction of mining equipment and infrastructure.
These are just a few examples, and there may be other industries that use these structural steel grades based on their specific requirements.