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Galvanized Steel Pipe Manufacturers
Baolai Steel is one of the leading galvanized steel pipe manufacturers and galvanized steel pipe suppliers, offering high-quality hot-dipped galvanized steel pipes and pre-galvanized steel pipes. Galvanization is a process that involves applying a protective zinc coating to steel or iron, which prevents rust and corrosion, significantly extending the pipe’s lifespan. Baolai’s galvanized pipes are widely used across various industries—not only as pipeline pipes for low-pressure fluids like water, gas, and oil but also as oil well pipes and oil pipelines in petroleum, especially for offshore fields. They also serve critical roles in chemical coking equipment, coal distillation washing oil exchangers, mine tunnel supports, and more, demonstrating their versatility and durability.
What is Galvanized Steel Pipe?
Galvanized steel pipe is a welded or seamless steel pipe with a hot-dip or electro-galvanized layer on the surface.
Galvanization is a process that involves applying a protective coating of zinc to metals like steel or iron. The zinc coating offers protection against rust and corrosion, effectively increasing the durability or longevity of the metal.
Baolai provides hot-dip galvanized steel pipe and pre-galvanized steel pipe according to project requirements.
Standard: BS1387, ASTM A53, ASTM A500, ASTM A106, EN10217, EN 10255, JIS 3444, JIS 3452, ASTM A795
When requesting a quotation from Baolai Steel, provide the required standard, pipe size and wall thickness, length, galvanizing method, and zinc-coating requirement where applicable. This helps buyers compare quotations on the same technical basis and reduces the risk of missing requirements or later specification changes.
The process of hot dipped galvanized steel pipe and pre-galvanized steel pipe
Hot-dip galvanized steel pipes processing
Hot-dip galvanised pipes are manufactured by dipping the descaled steel pipe into a zinc solution at around 500°C. The galvanised layer enhances the anti-corrosion properties of the steel pipe and extends the service life of the pipe. Hot dipped galvanized steel pipe is mostly utilized in the transmission of coal, gas, and steam, also used for construction, such as scaffolding, greenhouse, and structure.
Pre-galvanized stele pipes processing
Pre-galvanized steel pipe refers to pipe which was galvanized while in sheet format, thus prior to further manufacturing. After the sheet is sent through the mill to be galvanized it is cut to size and recoiled. The pipe thickness will be minimum 12 µm.
The differences of hot-dip galvanized pipes and pre-galvanized pipes
1.Raw material
The processing technology of pre-galvanized steel pipe differs from that of hot-dip galvanizing mainly in the raw materials used. The raw materials of pre-galvanized steel pipes are mainly galvanized steel coils. After the factory processes the galvanized coil into a steel pipe, it is no longer necessary to galvanize again, and it is only necessary to supplement zinc on the welded part.
2.Coating comparison
The two different galvanizing processes appear as a difference in the thickness of the zinc layer and the effect of use.
Coating thickness
Both methods result in a uniform thickness for the coating. However, the hot-dipped galvanization produces a thicker layer of protection than the pre-galvanization does. The minimum average thickness of hot-dip galvanized steel is of 45-85μm while it is between 20 and 30 μm for the pre-galvanized products.
Effectiveness
Hot-dip galvanizing is descaling and galvanizing after the steel pipe is produced, the zinc layer is thicker and has continuity, so the corrosion resistance and abrasion resistance are better.
Pre-galvanized steel pipe is galvanized and cut and welded as needed before the steel pipe is produced, there is no zinc layer on the welds and the zinc layer is thinner, so the corrosion resistance is not as good as hot-dip galvanized steel pipe. The advantage of pre-galvanizing is that the zinc layer is more uniform and the appearance is more beautiful.
3.Price comparison
Because the pre-galvanized steel pipe is directly welded, the hot-dip galvanized steel pipe needs to be processed on the basis of the bare pipe. Therefore, the processing cost is much higher than that of the pre-galvanized steel pipe.
Pre-galvanized pipe can be suitable when the project specification allows a lighter zinc coating and the service environment does not require the higher corrosion protection typically provided by hot-dip galvanizing. When greater corrosion resistance or a heavier zinc coating is required, hot-dip galvanized pipe may be the more appropriate option.
4.Application
The pre-galvanizing process is favored by people because of its low plating cost, excellent protection properties and beautiful appearance, and is widely used in construction, machinery, solar energy and other fields.
Due to the better anti-corrosion properties and quality of hot-dip galvanized steel pipe, some projects have to choose Hot Dipped Galv.Pipes, which mainly used in transmission of coal gas, steam & construction.
