Galvanized Iron vs Stainless Steel – What’s the Difference?

Galvanized iron and stainless steel are two commonly used metals in various industries, each offering its unique set of advantages and disadvantages. While both materials are used for similar applications, they differ significantly in many aspects. So, Galvanized Iron vs Stainless Steel – what’s the difference? In this article, we aim to provide a detailed comparison between galvanized iron and stainless steel, focusing on their properties, corrosion resistance, applications, and cost considerations.

Galvanized Iron vs Stainless Steel – What’s the Difference?

Galvanized Iron vs Stainless Steel – 1. Composition and Properties

Galvanized iron is made by coating iron with a thin layer of zinc. This coating is achieved through a process called galvanization, where the iron is submerged in a molten zinc bath. The resulting material combines the strength and ductility of iron with the corrosion resistance of zinc. Galvanized iron is generally cheaper and easier to work with compared to stainless steel.

Stainless steel, on the other hand, is an alloy of iron with added chromium content, typically ranging from 10.5% to 30% by weight. The chromium content forms a protective oxide layer on the surface of the steel, known as the “passive layer,” which prevents corrosion. Stainless steel is also known for its high strength, ductility, and resistance to high temperatures.

Galvanized Iron vs Stainless Steel – 2. Corrosion Resistance

The corrosion resistance of galvanized iron is primarily due to the protective zinc coating. However, this coating can be scratched or damaged, exposing the underlying iron to corrosion. Galvanized iron is suitable for indoor and outdoor applications where the zinc coating is not likely to be severely damaged.

In contrast, stainless steel’s corrosion resistance is much more superior. The passive layer on the surface of stainless steel resists corrosion even in harsh environments. It is widely used in outdoor applications, especially in marine environments and chemical processing industries.

Galvanized Iron vs Stainless Steel – 3. Applications

Galvanized iron is commonly used in construction, roofing, and fencing due to its low cost and ease of fabrication. It is also used in automotive parts, appliances, and pipes. However, its corrosion resistance limits its use in severe environments.

Stainless steel, on the other hand, finds applications in a wide range of industries due to its superior corrosion resistance and mechanical properties. It is used in the food processing industry, medical equipment, chemical plants, and automotive components. Stainless steel is also used in architectural applications such as railings, cladding, and interior finishes due to its aesthetic appeal and durability.

Galvanized Iron vs Stainless Steel – 4. Cost Considerations

Galvanized iron is generally cheaper than stainless steel due to its simpler manufacturing process and lower material costs. This makes it a popular choice for cost-sensitive applications where corrosion resistance is not a critical concern.

Stainless steel, on the other hand, is more expensive due to its higher alloy content and manufacturing complexity. However, its superior corrosion resistance and mechanical properties justify the higher cost in applications where durability and longevity are essential.

Conclusion

Galvanized iron and stainless steel are both versatile and durable metals, but they differ significantly in composition, properties, and applications. Galvanized iron offers good corrosion resistance and is suitable for indoor and outdoor applications where the zinc coating is not likely to be damaged. In contrast, stainless steel’s superior corrosion resistance and mechanical properties make it ideal for severe environments and high-end applications. 

Thank you for reading our article and we hope it can help you to have a better understanding of the differences between Galvanized Iron vs Stainless Steel. If you are looking for stainless steel products suppliers online now, please don’t hesitate to contact Sino Stainless Steel.

As a leading supplier of stainless steel products from Shanghai, China, Sino Stainless Steel provides customers with high-quality stainless steel sheets, stainless steel tubes, stainless steel pipes, stainless steel strips, stainless steel coils, stainless steel plates, and stainless steel bars at a very competitive price.