---
title: "Galvanized Steel: Different Types, Processes, and Applications"
description: Discover the different types of galvanized steel, how it's made, and the many industries that rely on its strength and corrosion resistance. Learn about hot-dip galvanizing, coating classes, and more!
image: https://blog.krytonmetals.com/hubfs/AdobeStock_127029426-800.jpg
---

[Metal Fabrication](https://blog.krytonmetals.com/tag/metal-fabrication)

 Kryton Metals Blog

# Galvanized Steel: Different Types, Processes, and Applications

![](https://blog.krytonmetals.com/hubfs/AdobeStock_127029426-800.jpg)

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[ KRYTON Metals Team ](https://blog.krytonmetals.com/author/kryton-metals-team)

 April 16, 2024

Galvanized steel is a widely used material in various industries, prized for its resistance to  
corrosion and red rust through galvanization—a manufacturing process where zinc is coated  
to steel to offer protection and prevent rusting. However, not all galvanized steel is created  
equal. Different series and grades of galvanized steel offer unique properties and advantages,  
making it essential to understand the distinctions when choosing the right material for a  
fabrication job or a project.

## HOW DOES IT WORK?

There are many galvanizing processes out there, but the most commonly used method is  
hot-dip galvanizing, which involves immersing steel in molten zinc. This process initiates a  
metallurgic bond between the zinc and the metal. After removal from the bath, the metal  
reacts with the oxygen in the atmosphere, forming zinc oxide, which further reacts with  
carbon dioxide to create zinc carbonate—this results in a protective coating known as  
“spangle.”

![AdobeStock_328841419](https://blog.krytonmetals.com/hs-fs/hubfs/AdobeStock_328841419.jpeg?width=7200&height=4800&name=AdobeStock_328841419.jpeg)

### APPLICATIONS

 Galvanized metals are used almost everywhere from bodies of cars and bicycles to nuts,  
bolts, tools, and wires. Galvanized steel is also used in:

- **Structures** - Balconies, verandahs, staircases
- **Outdoors** - Ladders, walkways, fences, sidings
- **Wind/Solar** - Solar panel mounting structures, wind turbine towers
- **Automotive** - Car body panels, chassis and frame components, exhaust systems
- **Construction** - Highway guardrails, structural framing, roofing and cladding
- **Telecommunication** - Cell towers, cable support systems, equipment enclosures
- **Agricultural** - Farm buildings, livestock equipment, irrigation systems
- **HVAC** - Ductwork/ventilation systems, air handling units, grilles, registers, diffusers

Spinning metal such as galvanized steel is often associated with various industrial  
applications. Metal spinners often specialize in shaping galvanized steel and other metals  
using precision tools and techniques. Additionally, spin forming and custom metal spinning  
services offer bespoke solutions for clients seeking unique designs and specifications.  
Metal spinning breathes life into galvanized steel, shaping it to create indispensable  
components such as lighting fixtures that illuminate spaces, grain bins that store agricultural  
harvests, metal fans that move air, fuel tanks that power vehicles, and an array of other vital  
industrial and consumer products.

![AdobeStock_225544174](https://blog.krytonmetals.com/hs-fs/hubfs/AdobeStock_225544174.jpeg?width=4000&height=2247&name=AdobeStock_225544174.jpeg)

 

### ADVANTAGES

- **Low Initial Cost** - In comparison to most treated steels, galvanized steel is more  
  cost-effective and ready-to-use when delivered, eliminating the need for additional  
  surface preparation, inspections, or coatings, saving companies time and money.
- **Longevity** - Galvanization ensures that industrial steel can endure for more than 50  
  years in typical environments, and even over 20 years in severe water conditions,  
  without the need for maintenance.
- **Sacrificial Protection** - The sacrificial anode makes it so that any compromised steel  
  remains shielded by the surrounding zinc coating. Even if the steel section is  
  scratched/damaged and exposed, the zinc will corrode before the steel, providing  
  sacrificial protection to the damaged areas.
- **Corrosion/Rust Resistance** - While iron elements in steel are highly susceptible to  
  rusting, the zinc layer serves as a protective barrier, shielding the steel from moisture  
  and oxygen. This property extends to sharp corners and recesses—areas that are often  
  challenging to protect with other coatings.

 

### COATING CLASSES

The most common types of galvanized steels out there are G30, G40, G60, and G90, which  
have been placed in a zinc bath for improved corrosion resistance for outdoor applications.  
The weight of the zinc coating is denoted by the number following the G, such as G90  
indicating a zinc coating of 0.9 oz/ft²—if equally applied to both sides of a square foot sheet,  
there would be a minimum of 0.45 ounces on each surface.

In most applications and environments, the corrosion performance is directly proportional to  
the coating thickness. In other words, G60 has twice the thickness of a G30 coating, and the  
life of the product in a given environment is approximately twice as long.

 

### OTHER GALVANIZING PROCESSES

Besides hot-dip galvanization, there are other processes of galvanizing steel. Not as popular  
as hot-dip, galvannealing combines annealing and hot-dip galvanizing to create a  
specialized, matte-gray finished steel coating.

Akin to hot-dip galvanizing but conducted early in product, pre-galvanizing primes sheet  
metal by rolling it through a cleaning agent before immersing it in molten zinc and recoiling  
it. This process allows for rapid galvanization of steel sheets on a large scale, ensuring a more  
uniform coating.

Distinct from the molten zinc bath, electrogalvanizing employs an electric current in an  
electrolyte solution applied to steel, causing zinc ions to deposit onto positively charged steel  
surfaces. This process, like pre-galvanizing, is done at the beginning of production and offers  
an alternative to traditional methods.

### WRAPPING UP

Overall, understanding the differences between galvanized steel processes and types  
empowers businesses and manufacturers to make informed decisions based on their specific  
needs and requirements. By leveraging the right combination of galvanized steel  
components, projects can achieve optimal performance, durability, and cost-effectiveness,  
ensuring long-term success and satisfaction.

Want to learn more about galvanized steel or interested in requesting a quote? Click [here](https://krytonmetals.com/contact-us/) to  
get in touch with us!

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## [Metal Spinning VS Metal Rolling: The Ultimate Comparison](https://blog.krytonmetals.com/metal-spinning-vs-metal-rolling)

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