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What Are the General Requirements for Steel Properties in Solar Mounting Structures?

2025-09-26

Tensile Strength and Yield Point: A high yield point can reduce the cross-section of steel members, lighten the self-weight of the structure, save steel materials, and lower the overall project cost. High tensile strength can increase the overall safety reserve of the structure and improve the reliability of the structure.
Plasticity, Toughness, and Fatigue Resistance: Good plasticity allows the structure to undergo significant deformation before damage, which helps in timely detection of issues and implementation of remedial measures. It can also adjust local peak stresses. In solar panel installation, forced installation is often adopted to adjust the angle; plasticity enables the structure to achieve internal force redistribution, making the stress at previously stress-concentrated parts of the structure or components more uniform and enhancing the overall load-bearing capacity of the structure. Good toughness enables the structure to absorb more energy when damaged under external impact loads. This is particularly important for desert power stations and rooftop power stations with strong winds, where wind vibration effects are significant—steel toughness can effectively reduce the risk level. Excellent fatigue resistance also equips the structure with a strong ability to resist alternating and repeated wind loads.
Processability: Good processability includes cold workability, hot workability, and weldability. The steel used in photovoltaic steel structures must not only be easy to process into various forms of structures and components but also ensure that these structures and components do not suffer excessive adverse effects on strength, plasticity, toughness, and fatigue resistance due to processing.
Service Life: Since the design service life of solar photovoltaic systems is more than 20 years, good corrosion resistance is also a crucial indicator for evaluating the quality of mounting systems. If the service life of the mounting structure is short, it will inevitably affect the stability of the entire structure, prolong the investment payback period, and reduce the economic benefits of the entire project.
On the premise of meeting the above conditions: The steel used in photovoltaic steel structures should also be easy to purchase and produce, and at a low cost.

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