1.What are the characteristics of galvanized round pipes classified by production process?
Hot-dip galvanized pipe process: The steel pipe is first pickled to remove the surface oxide scale, and then immersed in 450-460℃ molten zinc liquid to form a composite coating of zinc-iron alloy layer + pure zinc layer, with a total thickness of generally 55-100μm.
Electrogalvanized pipe process: A zinc layer is deposited on the surface of the steel pipe through an electrolytic reaction, with a thickness of generally 5-15μm.
2.What are the characteristics of hot-dip galvanized pipes?
Strong corrosion resistance: The zinc layer prevents the substrate from rusting through the principle of "sacrificial anode protection". The salt spray resistance test can reach more than 1,000 hours, which is suitable for harsh environments such as humidity and high salt (such as coastal areas and chemical workshops).
Strong coating adhesion: The zinc-iron alloy layer is firmly combined with the steel pipe and can withstand bending, welding and other processing without falling off.
Appearance: The surface is silver-gray with a slight zinc flower (crystallized pattern formed during cooling), which is beautiful and highly recognizable.
3.What are the characteristics of electrogalvanized pipes?
High coating uniformity: thickness error ≤ ±1μm, suitable for precision parts (such as furniture pipes, auto parts).
Smooth and clean surface: can be directly painted without post-treatment, paint adhesion is better than hot-dip galvanized pipe (need to be combined with phosphating or chromium-free passivation).
Low cost but weak corrosion resistance: salt spray resistance test is about 200-500 hours, suitable for dry indoor environment (such as building threading pipes, furniture frames).
4.What are the classifications by pipe type?
Welded galvanized pipe: made of rolled and welded steel plates, with common specifications of DN15-DN200, low cost and high production efficiency, widely used in water and gas pipes, steel structure brackets.
Seamless galvanized pipe: made of perforated and rolled round steel, with strong pressure bearing capacity (maximum pressure resistance ≥10MPa), suitable for high-pressure pipelines (such as oil transportation, thermal power pipelines), but the price is 30%-50% higher than welded pipes.
5.What are the core advantages of galvanized round pipes?
Long life and low cost: The service life of hot-dip galvanized pipes can reach more than 50 years under normal conditions, and the comprehensive cost is only 1/3-1/2 of that of stainless steel pipes.
Flexible installation: Supports threaded connection, groove connection, welding (zinc treatment is required), and adapts to complex engineering scenarios.
Environmental protection and safety: The zinc coating is non-toxic and meets the drinking water transportation standards (such as GB/T 17219 certification), and can be used for tap water pipes.