Galvanized Steel Pipe
Product Name: Gi Pipe, CHS, Galvan Pipe
Size:DN15-300mm
Material:Q195,Q235,Q355
Wall thickness: 0.6mm~20mm
Pipe Ends：Bevelled,Plain,Grooved,Threaded
Length: 1m~12mtr
Standard: ASTM A53, API 5L, ASTM A252, ASTM A795, ISO65, DIN2440, BS1387. BS1139, EN10255, EN39, JIS3444, GB/T 3091 & GB/T13793.
Description: Galvanized steel pipe refers to a steel pipe that is coated with a layer of zinc on the surface of ordinary steel pipes. Through galvanizing treatment, a zinc protective layer can be formed on the surface of the steel pipe.
Hot dip galvanized steel pipe
Hot dip galvanized pipe is made by first processing ordinary steel pipes into shapes, and then hot-dip galvanizing the formed steel pipes. The thickness of the zinc layer on the steel pipes is usually between 30-200μm.
Pre galvanized steel pipe
Pre galvanized pipes are made by first galvanizing the steel strip, and then processing the galvanized steel strip into steel pipes. The thickness of the zinc layer on the steel pipe is generally around 10-30μm.
Galvanised Steel Pipe Specifications
| Outside Diameter | Wall Thickness |  |
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| DN | Inch | mm | mm | |
| 15 | 1/2" | 20~21.3 | 0.95~2.77 | |
| 20 | 3/4" | 25~26.9 | 1.1~2.87 | |
| 25 | 1" | 32~33.7 | 1.1~4.0 | |
| 32 | 1 1/4" | 40~42.4 | 1.1~4.0 | |
| 40 | 11/2" | 47~48.3 | 1.5~7.0 | |
| 50 | 2" | 58~60.3 | 1.8~7.0 | |
| 65 | 2 1/2" | 73~76.1 | 2.0~7.0 | |
| 80 | 3" | 87~88.9 | 2.2~8.0 | |
| 90 | 3 1/2" | 101.6~102.1 | 2.2~9.0 | |
| 100 | 4" | 113~114.3 | 2.2~9.0 | |
| 125 | 5" | 140~141.3 | 2.5~10.0 | |
| 150 | 6" | 165~168.3 | 2.5~10.0 | |
| 200 | 8" | 216~219.1 | 2.75~12.0 | |
| 250 | 10" | 272.8~273.2 | 5.0~13.75 | |
| 300 | 12" | 323.8~325 | 5.5~13.75 | |
Galvanized Steel Pipe End Processing
Youfa steel pipe can provide various end treatment methods for galvanized steel pipes, such as threads, grooved, plain end and bevelled end
Galvanized Steel Pipe Standards
Youfa Certificate
| Grade | Q195 = S195 / A53 Grade A Q235 = S235 / A53 Grade B / A500 Grade A / STK400 / SS400 / ST42.2 Q355 = S355JR / A500 Grade B Grade C |
| British Standards | BS1387, BS1139 |
| European Standards | EN10255, EN39 |
| American Standard | ASTM A53, API 5L, ASTM A252, ASTM A795 |
| Youfa has a dedicated steel pipe quality and testing center | ||
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| Impact Tester | Pipe Bend Test Machine | Salt Spray Test Chamber |
Youfa Group products have been awarded the title of "Tianjin Famous-brand Products" by the Tianjin Municipal Government for many consecutive years The steel pipes of "Youfa"brand and"Zheng. jinyuan"brand won the Gold Cup Award, the highest award in China's metallurgical industry.By the end of 2021, Youfa Group has 178 authorized patent technologies, including 19 invention patents and 159 utility model patents.At the same time, we have 4 nationally recognized laboratories, 1 Tianjin Welding Steel Pipe Technology Engineering Center, and 2 Tianjin Enterprise Technology Centers.
Galvanized Steel Tube Manufacturing
The thickness and uniformity of the zinc layer on galvanized steel pipes are crucial for their anti-corrosion performance
During the production of galvanized steel round tube, the following steps require special attention
Weld seam treatment
Polish, repair, and inspect the welds of steel pipes to remove defects and avoid leakage issues during subsequent use.
Galvanized treatment
Immerse the steel pipe in molten zinc solution to attach a layer of zinc on the surface of the steel pipe, in order to improve its corrosion resistance.
Inspection and packaging
Conduct various quality inspections on finished steel pipes, including size, appearance, weld quality, zinc layer thickness, etc
Packing & Loading
During the packaging and transportation of galvanized steel pipes, it is particularly important to ensure that the galvanized layer on the surface of the pipe is not damaged, avoid direct contact with sharp objects, and prevent scratches and collisions.
For the packaging of galvanized steel pipes, we can provide various packaging methods such as bundling packaging, plastic film packaging, frame fixed packaging, rust proof paper packaging, etc. We can also customize according to customer requirements
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Galvanized Steel Pipe Products
Application of Galvanized Steel Pipes
Galvanized steel pipes are widely used in various fields, including construction, agriculture, and industry.
Building field
Water supply and drainage system: It forms the entire building's plumbing system in residential buildings
HVAC system: responsible for delivering hot water in the heating system and providing warmth to the room.
Fire protection system: Ensure rapid water supply and fire extinguishing in case of a fire
Agriculture field
Irrigation of farmland: providing irrigation water for crops.
Farm: Water supply and drainage system used for farms
Industrial field
Chemical industry: transporting various chemical liquids and gases
Mechanical manufacturing: as pipelines for hydraulic and pneumatic systems.
Oil and gas industry: used for some small oil and gas pipelines
Why Choose YOUFA Steel Pipe?
Tianjin Youfa Steel Pipe Group Co., Ltd. was established on July 1, 2000, Youfa is a large scale steel products manufacturing enterprise. In December 2020, Youfa Group successfully landed on the main board of Shanghai Stock Exchange .We mainly manufacture ERW steel pipe, galvanized steel pipe, hollow section steel pipes, SSAW steel pipe, plastic lining composite pipe, plastic coated steel pipe, stainless steel pipe and pipe fitting, and scaffolding, etc.
We have built a long-term cooperation with many clients, and have received word of praise from customers all over the world.possessing normative QAS, we have acquired certificates of API5L, ISO9001,ISO14000, ISO18000, FPC, BSI and UL/FM quality system.We are committed to meet customer's various after-processing requirements.
Carbon steel pipes meet the following standards: API 5L, ASTM A53/A500,ASTM A795, EN10219/10255, BS1387,BS1139, EN39, ISO65, DIN2440, JIS G3444/3466, etc. and are approved by the Third Party. They are widely used in oil and natural gas, low pressure liquid and mineral powder delivery, and for industrial and civil construction fields and for piles field.
Benefits of Galvanized Steel Pipe
Strong Corrosion Resistance
One of the biggest issues of any type of metal is corrosion, as it damages and weakens the surface, causing parts and sections to break after a certain period of time. Rust is caused by oxidization, which leaves marks that stain and damage the steel. This is why it is best to have a steel surface that is protected against these elements and has increased strength and resistance.
Using Galvanized steel pipes provides you with these benefits, as the molten zinc layer ensures that your pipes would not be easily corroded, and have an extra later that can keep it safe from different kinds of wear and tear. This is beneficial for industries that handle volatile substances such as chemicals and gases, as they can easily cause damage to solid materials that do not have treated surfaces.
Long Lifespan
With an extra protective layer of molten zinc present on the surface, galvanized steel pipes have a longer lifespan compared to conventional piping. This means that they can last for a number of years before needing to be replaced, ensuring that various substances have a proper channel where they can be moved to different locations. Steel is designed to last for a long period of time, which is why using galvanized steel pipes would be the best option for a wide variety of industries.
Cost-Effective
Steel maintenance can be very costly, as industries regularly conduct checks and repairs in order to make sure that their equipment and facilities are operating effectively. Using conventional steel pipes tend to wear out more quickly, which means that you would need to repair and replace the pipes more often.
Compared to conventional steel pipes, galvanized steel pipes have a lifespan of 50 years, compared to 20 to 25 years by using the former. This can cause you to spend more on buying replacement parts. By using galvanized steel pipes, you would have a set of pipes that can last longer, which means that you would be able to lessen maintenance and repair costs.
Quick Installation
Along with having a strong protective surface that increases resistance to wear and tear, galvanized steel pipes are easy to install. This is due to the fact that these pipes are ready-made, which means that you would no longer need to prepare or paint the surface before installing these sections. This drastically lessens the construction time by a number of minutes or hours, making sure you would be able to finish projects at a much faster rate. If you have a tight project deadline for your construction project, using galvanized steel pipes are the most efficient option.
Signs of Galvanized Steel Pipeline Corrosion
Discoloration
Corrosion can cause the zinc coating to wear off unevenly, resulting in patches of discoloration on the pipe's surface. These patches might appear dull, white, or chalky.
Rust
Despite the zinc coating's protective nature, if it becomes compromised, the underlying steel can start to rust. The presence of reddish-brown rust on the surface of the pipe is a clear indication of corrosion.
Flaking and Peeling
As corrosion progresses, the zinc coating may begin to flake or peel away from the pipe's surface. This exposes the steel underneath and accelerates the corrosion process.
Rough Texture
Corroded areas on galvanized steel pipes might feel rough or uneven to the touch. This is due to the degradation of the zinc coating and the formation of rust.
Reduced Water Pressure
As corrosion builds up inside the pipe, it can constrict the flow of water, leading to reduced water pressure in fixtures connected to the pipe. This is often noticeable when water flow suddenly becomes weaker than usual.
Leaks
Corrosion can weaken the pipe's structure, making it more prone to developing leaks. Look for signs of water stains, dampness, or puddles near or around the pipes.
Unpleasant Taste or Odor
If the corrosion affects the water quality within the pipes, you might notice an unusual taste, odor, or discoloration in the water coming from your faucets.
Visible Corrosion on Joints and Fittings
Corrosion is often more prominent at pipe joints and fittings due to the disruption of the zinc coating during installation. Check these areas for signs of rust and deterioration.
Corrosion Scale
Inside the pipes, corrosion can lead to the formation of scale, which is a buildup of corrosion byproducts. This scale can restrict water flow and contribute to the overall deterioration of the pipe.
Noises
If you hear unusual sounds like rattling or banging when you turn on the water, it could be due to corrosion causing the pipe to become weakened and more susceptible to movement.
Best Ways To Prevent Galvanized Steel Pipe Corrosion
Preventing galvanized steel pipe corrosion involves a combination of proactive measures and maintenance practices to protect the integrity of the pipes and extend their lifespan. Here are some effective prevention strategies:
Regular Inspection
Regularly inspect the galvanized steel pipes for signs of corrosion, including discoloration, rust, flaking, and leaks. Early detection allows for timely intervention before the corrosion worsens.
Protective Coatings
Apply additional protective coatings to the galvanized steel pipes to provide an extra layer of defense against corrosion. Epoxy coatings and polyurethane coatings are commonly used for this purpose.
Cathodic Protection
Cathodic protection involves using sacrificial anodes made of a more reactive metal (like zinc or magnesium) connected to the pipeline. These anodes corrode instead of the pipeline, offering an added layer of protection.
Electrochemical Inhibitors
Electrochemical inhibitors can be introduced into the pipeline to mitigate corrosion. These inhibitors interfere with the electrochemical reactions that lead to corrosion.
Regular Cleaning
Keep the pipes clean and free from debris, sediment, and mineral deposits that can contribute to corrosion. Regular cleaning prevents the buildup of corrosive materials on the pipe’s surface.
Regular Maintenance
Develop a maintenance schedule that includes routine checks, cleaning, and addressing any identified corrosion promptly.
Consult Professionals
Work with corrosion experts and engineers to assess the condition of your pipelines and develop a customized corrosion prevention plan.
How Do I Know if I Have Galvanized Steel Pipe?
The galvanizing process bonds a layer of zinc onto steel. There are three main ways to tell if this has been done:
Thickness Measurement
Coating thickness is easily measured with a magnetic probe, providing the coating itself is non-magnetic, which of course zinc is. The beauty of this kind of measurement is that it's quick and nondestructive. That makes it easy to test material in multiple locations.
The downside of thickness measurement is that it's not actually confirming the presence of a zinc coating. It just measures separation of probe from the base steel. All it tells you is that the steel has been coated with something non-ferrous.
Electron Paramagnetic Resonance (EPR)
Sounding like something from a sci-fi movie, EPR is a technique for revealing what metals are present on a surface. In simplistic terms, a probe is brought into contact with the surface, and a signal sent that starts some of the surface electrons vibrating. By identifying the frequency responsible for each resonant response it's possible to deduce which materials are present.
There are two downsides to using EPR as a galvanization test. First, it's really just going to tell you there's zinc present on the surface. It could have been applied as paint rather than through galvanizing. And second, EPR kit is still very specialized and not inexpensive.
Laboratory Testing
This is the gold standard of galvanization testing. It might start with EPR or another spectroscopy technique to determine if zinc was present but would be followed by sectioning. These samples then go under a microscope to be examined for evidence of an intermetallic layer at the zinc-steel boundary. This is where iron diffuses into the zinc and it's only visible under magnification. Seeing layer confirms that the steel is galvanized.
Laboratory testing is the only way to be absolutely sure steel has been galvanized, but it has at least two drawbacks. It's slow, because sectioning takes time, and it's also a destructive process that can't be used on a finished fabrication.
How to Cut Galvanized Steel Pipe?
If you plan on cutting galvanized steel pipe, you will need a hacksaw, a tube-cutting tool, or a reciprocating saw. You may need multiple cutting devices if you have several sizes of pipe.
To cut with a hacksaw
Secure the pipe in a vise or clamp, and support the longer end if necessary. Start cutting. Since you have no motor, you'll need a lot of time and energy to cut this way, but it can be done. That said, don't use too much pressure. Once the steel separates, file down the cut ends.
To cut with a tube-cutting tool
When you start cutting, you'll need to rotate your cutter around the pipe several times. Once the cut is made, ream the pipe to avoid leaving burred ends. To do this, you'll need a tool called a reamer.
To cut with a reciprocating saw
This motorized cutting tool gets the job done fast. Put on your PPE, mark your cut, clamp your pipe down, and let that wheel do its work. Just make sure you don't start with the wheel pressed directly against the pipe as this can cause it to snag on the pipe and damage the blade.
How Long Does Galvanized Steel Pipe Last?
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Prediction of When Zinc Layer will be Consumed on Galvanized Steel |
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Galvanized Steel kept in the wet or soaked environments |
10 Years |
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With a relative humidity of 100% |
34 Years |
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With a relative humidity below 60%. |
211 Years |
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Ultimate FAQ Guide to Galvanized Steel Pipe
Q: What is galvanized steel pipe?
Q: How does galvanized steel pipe resist corrosion?
Q: What is galvanized steel pipe used for?
Q: Galvanized steel pipe: How to tell if steel has been galvanized?
Thickness measurement.
Electron paramagnetic resonance (EPR).
Laboratory testing.