1. The color of hot-dip galvanized steel pipe is generally uniform, the inner and outer walls are smooth and flat, and there are no defects such as bubbles, dents, impurities, etc. That affect the surface performance.
2. It depends on whether the markings on the product are complete. The steel pipe must have the name of the manufacturer or trademark, production date, product name, size, and implementation standard number. The hot-dip galvanized steel pipe must have the product name, nominal outer diameter, and pipe. Series S, etc., the handwriting should be clear, and check whether the logo is consistent with the actual situation.
3. You should buy pipes and fittings of the same brand. Because different brands of products may have different raw materials, it will cause unfavorable factors for the welding of pipes and fittings, and will cause leakage at the welded joint during long-term use.
4. Good hot-dip galvanized steel pipes have high strength and are not unbreakable, so the quality of steel pipes cannot be judged by whether they can be broken. Since the impact resistance of steel pipes is better than that of real steel pipes, steel pipes are easier to smash, and steel pipes are often unbreakable.
