1) The corrosion resistance of galvanized steel sheets is 3 to 5 times that of galvanized steel sheets, and the more severe the corrosion, the greater the difference. Therefore, in the construction roof, galvanized steel sheet AZ150 should be preferred. If galvanized steel is used, it should not be lower than Z275, and its service life is much lower than that of AZ150. Therefore, Australia and other countries clearly stipulate that if galvanized steel is used as roof (wall), Z450 must be used.

2) AZ150 is about 10-20% more expensive than Z275, but its corrosion resistance is 3~5 times. It can be seen that galvanized steel has excellent performance and price ratio.

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