Appearance quality: Good galvanized steel pipes should have a smooth and even surface, without cracks, oxide scale, burrs, and other defects. There should also be no obvious damage or peeling of the zinc layer. Especially for the welded parts, the welding should be uniform without bumps or burrs, as this will affect the galvanizing effect.
Wall thickness, inner and outer diameters, and length: Besides appearance quality, wall thickness, inner and outer diameters, and length are also important indicators to judge the quality of galvanized steel pipes. Good galvanized steel pipes should meet the corresponding standard requirements, with uniform wall thickness and inner and outer diameters. The length should also comply with relevant standards or contract requirements. Additionally, for straight-seam pipes, the galvanized layer at the rear weld seam should be more uniform than other parts to ensure the overall quality of the galvanized steel pipe.
Quality of zinc coating: The quality of the zinc coating is a crucial factor in judging the quality of galvanized steel pipes. It can be judged from aspects such as the thickness, adhesion, and number of nodes of the zinc coating. A good zinc coating should be uniform and free from obvious疏松 (porosity), air holes, and other defects, as these can easily lead to zinc loss during use. Furthermore, a good zinc coating should have good adhesion and a sufficient number of nodes. One can scratch the surface with a penknife; if the scratch is small and does not expose the base metal, it indicates good quality of the zinc coating.
Reliable manufacturer: Choosing a reliable manufacturer is also an important aspect in judging the quality of galvanized steel pipes. Good manufacturers have technical teams and after-sales services to provide more comprehensive assistance, and customers often give positive feedback and evaluations.
