"护顶钢板" can be translated as "roof protection steel plate" or "overhead protective steel plate" in English, depending on the specific context and usage.
"Roof protection steel plate" emphasizes its function of protecting the roof area.
"Overhead protective steel plate" is more general, indicating that it provides protection from above, which could also be applicable in certain contexts where the plate is not specifically for a roof but serves a similar overhead protective purpose.
In engineering or construction - related contexts, both translations could be appropriate, and the choice may depend on the detailed description of the part's role in the overall structure.