Pre-galvanized and hot-dip galvanized steel pipes

Pre-galvanized and hot-dip galvanized steel pipes are two common anti-corrosion treated steel pipes. They use different galvanizing processes to improve the corrosion resistance of steel pipes, thereby extending their service life. When choosing these two types of steel pipes, it is important to understand their differences and their respective application scenarios.

1. Pre-galvanized steel pipes

Pre-galvanized steel pipes are galvanized before steel processing to form a uniform zinc layer of 20-30 microns to prevent oxidation and corrosion. Its advantages are fast production, low cost, and beautiful appearance. It is widely used in indoor light structures, household appliances, and furniture.

However, the corrosion resistance of pre-galvanized steel pipes is limited, especially in humid or highly corrosive environments, the protective effect is reduced, so it is more suitable for dry environments, such as indoor pipes and ventilation systems.

2. Hot-dip galvanized steel pipes

Hot-dip galvanized steel pipes are immersed in high-temperature zinc liquid after being made into steel pipes to form a 50-100 micron thick zinc layer, which has strong corrosion resistance and durability. Its zinc layer is dense and suitable for harsh outdoor environments. It is widely used in buildings, agricultural facilities, transportation equipment and outdoor structures such as fences and poles.

Although the cost is slightly higher than that of pre-galvanized steel pipes, its excellent anti-corrosion performance and long service life are especially suitable for structures in humid, acidic or salt spray environments.

Summary: Pre-galvanized steel pipes are more suitable for light applications and have relatively low costs; while hot-dip galvanized steel pipes are more suitable for heavy corrosion environments and have better protection effects.