Prime Hot Dip Galvanizing Steel

Specifications

Prime Hot Dip Galvanizing Steel  

Hot dip galvanizing is the process of coating iron or steel with a layer of zinc by immersing the metal in a bath of molten zinc at a temperature of around 860 °F (460 °C). During the process, a metallurgically bonded coating is formed which protects the steel from harsh environments, whether they be external or internal. Galvanized steel is widely used in applications where corrosion resistance is needed without the cost of stainless steel and can be identified by the crystallised pattern on the surface (often called a ‘spangle’). Galvanizing is probably the most environmentally friendly process available to prevent corrosion.  

How It's Made

One of the most common ways of making steel resist rust is by combining (alloying) it with a metal that is less likely to corrode: zinc. When steel is submerged in melted zinc, a chemical reaction permanently bonds the zinc to the steel. Therefore, the zinc isn't exactly a sealer, like paint, because it doesn't just coat the other metal; it actually permanently becomes a part of it. The most external layer is all zinc, but successive layers are a mixture of zinc and iron, with an interior of pure steel.

This process, known as hot-dipped galvanization, is one of the most common methods of making galvanized steel, but it's not the only one. Continuous sheet galvanizing runs a steel sheet or wire through molten zinc; it's also a form of hot-dipping, but leaves a thinner layer of the protective metal. Steel can also be painted or sprayed with zinc, although neither method creates the strong bond that hot-dipping does. Electrogalvanizing or electroplating uses electricity to create the bond between the two metals, which results in relatively thin layer of zinc.

The degree of galvanizing is usually described as the zinc's weight per surface area rather than its thickness, because this gives a better representation of how much metal has been applied. Steel often gets galvanized after individual parts have been formed, such as braces, nails, screws, beams, or studs. Continuous sheet galvanizing is often done before the metal is used to create products, however, and can withstand some bending and forming without flaking.

Prime Hot Dip Galvanizing Steel Process

When the clean iron or steel component is dipped into the molten zinc (which is commonly at around 450°C) a series of zinc-iron alloy layers are formed by a metallurgical reaction between the iron and zinc. The rate of reaction between the steel and the zinc is normally parabolic with time and so the initial rate of reaction is very rapid and considerable agitation can be seen in the zinc bath. The main thickness of coating is formed during this period. Subsequently the reaction slows down and the coating thickness is not increased significantly even if the article is in the bath for a longer period of time. A typical time of immersion is about four or five minutes but it can be longer for heavy articles that have high thermal inertia or where the zinc is required to penetrate internal spaces. Upon withdrawal from the galvanizing bath, a layer of molten zinc will be taken out on top of the alloy layer. Often this cools to exhibit the bright shiny appearance associated with galvanized products.  Post galvanizing treatment can include quenching into water or air cooling. Conditions in the galvanizing plant such as temperature, humidity and air quality do not affect the quality of the galvanized coating. By contrast, these are critically important for good quality painting.

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  Prime Hot Dip Galvanizing Steel

Certification

	Company  Certification	Certificate Authority
1	Stainless steek Processing Chamber of  Commerce of Tianjin-president enterprise	Tianjin Development and Reform Commission  and Tianjin Federation of Industry and Commerce
2	Quality revitalization demonstration enterprises  and demonstration products of China	Technical Supervision of ChinaTianjin branch and The northern survey planning firm
3	Recognized Satisfaction Unit	Social Investigation Office of China
4	Administrative efficiency supervision posts	Tianjin Supervision Bureau and  Tianjin Federation of Industry and Commerce
5	BM TRADA	Testing and certification company of England
6	Additional remark	More certificates can be supplied as your request

 

 

 

                                                                     Prime Hot Dip Galvanizing Steel

 Equipment

Prime Hot Dip Galvanizing Steel

                                                                       

 

 

 

 

 

FAQ

 Q: Benefits of Galvanization

A:Zinc protects steel in two ways. First, it is highly resistant to rust; iron, a major component of steel, reacts very easily with oxygen and moisture and will eventually disintegrate. The layer of zinc on the surface prevents those elements from reaching the steel so quickly. It also develops a patina — a layer of zinc oxides, salts, and other compounds — that offers further protection. Zinc is also extremely durable and scratch resistant, and has a satiny appearance that many find attractive.

 

The outer layer also protects the steel by acting as a "sacrificial layer." If, for some reason, rust does take hold on the surface of galvanized steel, the zinc will get corroded first. Even in areas where the surface is scratched or damaged, the surrounding zinc will still corrode before the steel does. The lifespan of galvanized steel varies, but industrial steel with a 3.9 mil (0.0039 inches or 0.09906 mm) thick coating can last more than 70 years without maintenance under average conditions.

 

Q: Uses

A: Galvanized steel can be found almost everywhere. Many individuals live in steel frame houses, and buildings are often made with galvanized steel roofs. There are multiple steel parts in cars that help protect them from the weather, and it's used in many marine applications due to its ability to withstand the salt and the elements. Besides being inexpensive, durable and effective, this metal is also popular because it can be recycled and reused multiple times.

 

 

Q: Disadvantages

A:There are relatively few disadvantages to galvanization, but it's not a good method for protecting all steel items. Some objects cannot be hot-dipped, often because they are too large or too small, and other forms of galvanizing often are not as protective and long-lasting. Eventually, the zinc will be corroded, although how long this takes depends on the thickness of the coating and the environment. Galvanized steel has a much shorter lifespan when it's regularly exposed to rain or seawater.

 

Galvanized steel that is cooled too slowly or stacked together before they have cooled completely can also have the outer zinc layer peel away. In some cases, small gaps can form between the zinc and the underlying alloy, which can also cause peeling. When a very thick coat of zinc is applied, it can also become brittle and flake off.

 

 

Q: Alternatives to Galvanization

A: Some metal items cannot be galvanized effectively; the coating of zinc would be too thick on a small screw, for example. In many cases, stainless steel, made with chromium, is used instead. Unlike galvanized metals, stainless steel is not coated in the metal; chromium is part of the composition of the steel alloy.

Contact

We are specialized in  Prime Hot Dip Galvanizing Steel  , having own factory, warehouse and advanced devices. So we can produce and process the steel as your need, with guarantee of high qulity and compititive price. Please contect me if you are interested, we will be happy to give you the details.  Welcome to visit the factory.

                                                                     Prime Hot Dip Galvanizing Steel

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  Prime Hot Dip Galvanizing Steel