Hot-dip galvanized steel pipe is produced by applying a dense zinc coating to the surface of welded steel pipe via the hot-dip galvanizing process; this effectively isolates the steel from air and moisture to prevent corrosion, resulting in excellent rust resistance and a long service life. In contrast, standard welded pipe lacks this galvanized coating and is better suited for indoor environments or projects requiring subsequent protective painting. Regarding applications, hot-dip galvanized steel pipe is widely used for photovoltaic mounting systems, greenhouses, steel-structure buildings, municipal engineering, and guardrail systems, whereas standard welded pipe is commonly utilized in machining, equipment manufacturing, and general structural applications. For projects involving long-term exposure to outdoor or humid environments, hot-dip galvanized steel pipe helps effectively reduce maintenance costs while enhancing the overall durability and economic efficiency of the project.