What Should You Pay Attention To When Purchasing Hot-dip Galvanized Rectangular Steel Pipes?

① Look at the zinc layer: it is uniform, bright, and has no leakage.
② Look at the size: square, no deformation, no distortion
③ Look at the weld: smooth and not cracked
④ Choose a big manufacturer: stable quality and warranty.
⑤ Don't just compare prices: low prices are mostly due to thin zinc layers and non-standard thin wall thicknesses.