1. Appearance of galvanized pipe fittings
The surface of high-quality galvanized pipe fittings should have a complete coating, consistent color, uniform transition, and no sagging, dripping, or unnecessary agglomeration on the surface. There should be no defects such as missing plating and exposed iron on the surface of the pipe fittings.

2. Thickness of galvanized layer
The thickness of the zinc layer of the galvanized pipe is an important indicator for judging the quality of galvanizing. Qualified galvanized steel pipes should have a wall thickness that meets the standard requirements. Too thin or too thick a wall thickness may affect the strength and durability of the pipe. The wall thickness of the galvanized steel pipe can be measured using a thickness gauge to ensure that it is within a reasonable range.

3. Uniformity of galvanized layer
The high-quality galvanized layer has a uniform texture and no leakage or damage after plating.

4. Adhesion of galvanized layer
The adhesion of the galvanized layer is an indicator to measure the firmness of the galvanized layer and the steel pipe. Good adhesion can ensure that the connection between the galvanized layer and the steel pipe is firm and not easy to peel off. You can use a knife or hard object to gently scratch the galvanized layer to observe whether there is any peeling phenomenon. If peeling is evident, it may mean that the galvanizing quality is poor.

1. Observe the cut end surface. The cut-end surface of high-quality galvanized pipes is smooth and neat. You can visually or touch it to determine whether the galvanized layer is evenly distributed. Poor-quality pipes may be uneven and lack metallic luster.
2. Check whether the size and geometry of the steel pipe meet the relevant dimensional and geometric tolerance requirements, including diameter, wall thickness, roundness, and other requirements.
3. Weighing and checking is also a good method. The material of poor-quality pipes contains more impurities, the density of steel is low, and the size exceeds the tolerance seriously.

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