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Excellent Corrosion Resistance: The zinc coating provides barrier protection while also delivering cathodic protection. Even if damaged, the zinc sacrificially corrodes to prevent rusting of the underlying steel.
Long Service Life: Under typical conditions, HDG pipes maintain functionality for 30–50 years or longer, substantially outperforming uncoated black steel pipes.
Robustness and Reliability: The metallurgical bond between the zinc-iron alloy and steel base ensures strong adhesion and high resistance to physical damage throughout handling and service.
Lifecycle Economy: Although initial costs are higher, the extended service life and reduced maintenance (no repainting or early replacement needed) lead to significant long-term savings.
Full Protection: The hot-dip process guarantees complete and uniform coating coverage on all surfaces-inside, outside, edges, and complex geometries.
Surface Preparation: Consisting of degreasing (to remove oils), pickling (using acid to eliminate scale and rust), and fluxing (to avoid re-oxidation and enhance zinc adhesion).
Zinc Immersion: The pre-treated pipe is fully immersed in a bath of molten zinc at approximately 450 °C, forming a series of zinc-iron alloy layers.
Cooling: The pipe is cooled, usually by water quenching, to solidify the coating.
Classification and Uses
Based on manufacturing technique, HDG pipes are mainly divided into two types:
Welded HDG Pipe: Formed by welding steel strip/plate (via ERW or SAW) and then galvanized. Commonly used in water supply, gas transmission, structural frameworks, scaffolding, fencing, and greenhouse construction.
Seamless HDG Pipe: Produced by piercing a solid billet to form a seamless tube before galvanizing. Ideal for high-pressure applications such as boiler tubes, hydraulic systems, and critical mechanical components where high strength and corrosion resistance are essential.
fAQ
Q:1.Can you provide samples?
A:
T/T (Wire Transfer): 30% deposit, 70% balance against copy of Bill of Lading.
L/C (Letter of Credit): We accept irrevocable letters of credit at sight.
Q:2.What is the Minimum Order Quantity (MOQ)?
A:We can offer more flexible options for standard products. If your order quantity is below the MOQ, a slight price adjustment may apply.
Q:3.What payment methods do you accept?
A:Computer Numberical Control (CNC) machining is a manufacturing process in which pre-programmed computer softeare dictates the movement of fact`ory tools and machinery. The process can be used to control a range of complex machinery, from girnders and lathes to mills and CNC routers.
Q:4.How long does it take to deliver samples?
Samples of existing standard products are usually shipped within 7 working days after receiving payment.
Q:5.What is the production lead time?
After receiving the deposit, the production cycle for regular products is approximately 30 days. The exact time depends on the order quantity and current production schedule. We will confirm an accurate timeline for each order.
Q:6.How do you ensure product quality?
We implement a strict full-process quality control system. From raw material inspection to the production line and final shipment, our professional QC team conducts inspections at every stage. We can also arrange for third-party inspections (e.g., SGS, BV) upon your request.
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