Hot - dip Galvanized

The hot dip galvanizing is a process of applying zinc coatings to components in steel or iron by immersing the component in a bath of molten zinc. The simplicity of the hot dip galvanizing process is an advantage on other methods of corrosion protection.

The term has been subsequently adopted to other methods of steel coatings by zinc and, sometimes, is used in general for electrolytic steel deposition. To avoid confusions, the immersion of liquid steel in zinc should be referred as hot dip galvanizing. In any situation where the zinc is corroded as a sacrificial coating for the steel, the available zinc mass determines the performance against corrosion.

Our process is divided into the following steps:

1. Cleaning – Bath in acid solution to remove oils, masses and other greases.

2. Rinsing – Washing realised to avoid contamination of the following bathes.

3. Pickling – Bath in hydrochloric acid to remove oxides and mill scales.

4. Rinsing – Washing realised to avoid contamination of the following bathes.

5. Fluxing – Solution of zinc chloride and ammonium chloride which acts as protection against oxidation between the pickling and zinc immersion.

6. Drying – Stage in an oven at 60ºC to dry the pieces and reduce the thermal shock upon immersion in the zinc bath. Furthermore acts as wetting agent of the pieces in the zinc bath.

7. Zinc Bath – Immersion in a bath of molten zinc between 440º and 465º to reaction between Fe/Zn which composes the final coating.

Why is the galvanized steel pipe better than other pipe?

When we talk about the galvanized steel pipes, we usually refer to the hot dipped galvanized steels pipes which are more durable and strengthened than any other types. The cleaning process which the hot dipped galvanized steel pipe uses is far more special in the combination use of the solutions, including the ammonium chloride, zinc chloride or the mixed solutions of both. And it will be sent into the hot dipped groove afterwards. The galvanized steel tube will be with more even layer of the galvanization and the capacity of cohesion, anti-corrosion and anti-dust. All of these as mentioned above will contribute to this kind of steel pipe to be have longer longevity than any other steel pipe kinds.

To maintain these galvanized steel tubes, we should keep in mind about these following steps:

1. Regular clean away the piling-up materials around the steel and control its loading under its limitation.

2. Regular observe if there is any deviation among the steel tube's whole structure of parts of it. If yes, make alteration in time.

Order---Hot Dipped Glavanized Steel Pipe Shipped to Oman

Product: Hot Dipped Galvanized Steel Pipe
Standard: BS 1387
Specification:
88.9mm*3mm*6.1meters
88.9mm*3.2mm*6.1meters
Surface: zinc coating 210g
Ends: Plain End
Quantity: 66 Tons
Production Time: 25 days
Destination: Oman info@primesteeltube.com

​

Galvanized Steel Pipe Production Process

Galvanized Steel PipeIn order to improve the corrosion resistance of the steel pipe, in general people will coated the steel pipe with zinc. Galvanized steel pipe is mainly used for transporting gas and heating.
If use galvanized steel pipe as water pipes for drinkable water, after many years of application, it turns out there are many rust inside the steel pipe which will influence the quality of the
drinking water.


Galvanized Steel Pipe Weight Formula: ( Outside Diameter - Wall Thickness) x Wall Thickness x 0.02466 * 1.0599 = Weight per Meter (kg / m)

There are two types of galvanized steel pipe in the market which is divided by the production processes.

Hot-dipped Galvanized Steel Pipe:

Hot-dipped zinc coating is the molten metal to react with the iron matrix alloy layer. So the substrate and the zinc coating combined well. The first production step is pickling the steel pipe.
In order to remove the surface of the iron oxide, cleaning bath by mixing an aqueous solution of ammonium chloride or zinc chloride aqueous solution for the after pickling steel pipe is
needed. And then the steel pipe is allowed to put in the hot dip tank. The using advantage for hot dipped galvanized steel pipe is the coating has strong adhesion and long using life.
Applying hot-dipped galvanizing process, the zinc coating will be combined with the surface of the steel pipe evenly.

Production Process:

Material Inspection (Steel Pipe) --- Hanging --- De-greasing --- Rinsing --- Pickling --- Washing --- Dipping Fluxing --- Hot Air Drying --- Inside and Outside Hot-dipped Galvanizing Blow
--- Cooling --- Passivation and Rising --- Unloading --- Inspection and Trimming --- Type Identification --- Packaging and Storing and Transportation.



Cold Galvanized Steel Pipe:

Cold Galvanizing process is also named as electro-galvanizing process which is using cold plates as raw material. Cold Galvanized Steel Pipe has very few zinc coating which is only around
10 ~ 50 g/m2. Compared with hot-dipped galvanized steel pipe, the corrosion resistance of cold galvanized steel pipe is not as good as hot-dipped galvanized steel pipe.
In order to ensure the quality of the galvanized steel pipe, most of the galvanized steel pipe manufacturers will not apply the electro galvanizing producing process. Only those small and
outdated manufacturers still use electro-galvanizing producing process to offer relatively cheaper galvanized steel pipe. Since the zinc layer for cold galvanized steel pipe is electroplated layer,
it is the individual layered zinc coating on the steel pipe, so the coating layer will be peel off easily. Overall, the producing cost for cold galvanized steel pipe is lower than hot-dipped
galvanized steel pipe, and the manufacturer can offer the purchaser a very competitive market price. However, the surface of the coating is uneven which influence the corrosion resistance
of the galvanized steel pipe.

Production Process:

Uncoiling (Galvanized Steel Strips/Plates) --- Leveling --- Welding --- Scraping the Scar --- Passivation and Rinsing --- Zinc adding --- Setting/Forming --- Type Identification --- Cutting
--- Packing --- Drying --- Weighed

Do you know the Using Advantages of Galvanized Steel Pipes ?

Galvanized Steel Pipes are widely used in many fields, do you know the reason why is so popular?Below is three main using advantages of Galvanized Steel Pipes you might want to know:


1. After being hot-dip galvanized, the pipes of the surface will be protected well. Compared with other type of coating process, deepen the zinc is easier to let the coating covered well.


2. Because the zinc coating has a larger hardness value than steel pipes. After being galvanized, the impact resistance and anti-ware properties of the steel pipes has increased.


3. In general, the zinc layer at the pipe ends will be relatively thicker than other type of coatings. Therefore, it offers better toughness and abrasion resistance to the Galvanized Steel Pipes.

The difference between hot-dipped galvanized steel pipe & cold galvanized steel pipe

Galvanized Steel Pipe

In order to improve the corrosion resistance of the steel pipe, in general people will coated the steel pipe with zinc. Galvanized steel pipe is mainly used for transporting gas and heating.
If use galvanized steel pipe as water pipes for drinkable water, after many years of application, it turns out there are many rust inside the steel pipe which will influence the quality of the
drinking water.
​
Galvanized Steel Pipe Weight Formula: ( Outside Diameter - Wall Thickness) x Wall Thickness x 0.02466 * 1.0599 = Weight per Meter (kg / m)

There are two types of galvanized steel pipe in the market which is divided by the production processes.

Hot-dipped Galvanized Steel Pipe:

Hot-dipped zinc coating is the molten metal to react with the iron matrix alloy layer. So the substrate and the zinc coating combined well. The first production step is pickling the steel pipe.
In order to remove the surface of the iron oxide, cleaning bath by mixing an aqueous solution of ammonium chloride or zinc chloride aqueous solution for the after pickling steel pipe is
needed. And then the steel pipe is allowed to put in the hot dip tank. The using advantage for hot dipped galvanized steel pipe is the coating has strong adhesion and long using life.
Applying hot-dipped galvanizing process, the zinc coating will be combined with the surface of the steel pipe evenly.

Production Process:

Material Inspection (Steel Pipe) --- Hanging --- De-greasing --- Rinsing --- Pickling --- Washing --- Dipping Fluxing --- Hot Air Drying --- Inside and Outside Hot-dipped Galvanizing Blow
--- Cooling --- Passivation and Rising --- Unloading --- Inspection and Trimming --- Type Identification --- Packaging and Storing and Transportation.

Cold Galvanized Steel Pipe:

Cold Galvanizing process is also named as electro-galvanizing process which is using cold plates as raw material. Cold Galvanized Steel Pipe has very few zinc coating which is only around
10 ~ 50 g/m2. Compared with hot-dipped galvanized steel pipe, the corrosion resistance of cold galvanized steel pipe is not as good as hot-dipped galvanized steel pipe.
In order to ensure the quality of the galvanized steel pipe, most of the galvanized steel pipe manufacturers will not apply the electro galvanizing producing process. Only those small and
outdated manufacturers still use electro-galvanizing producing process to offer relatively cheaper galvanized steel pipe. Since the zinc layer for cold galvanized steel pipe is electroplated layer,
it is the individual layered zinc coating on the steel pipe, so the coating layer will be peel off easily. Overall, the producing cost for cold galvanized steel pipe is lower than hot-dipped
galvanized steel pipe, and the manufacturer can offer the purchaser a very competitive market price. However, the surface of the coating is uneven which influence the corrosion resistance
of the galvanized steel pipe.

Production Process:

Uncoiling (Galvanized Steel Strips/Plates) --- Leveling --- Welding --- Scraping the Scar --- Passivation and Rinsing --- Zinc adding --- Setting/Forming --- Type Identification --- Cutting
--- Packing --- Drying --- Weighed