Mild Steel vs Carbon Steel – What’s the Difference

Mild Steel vs Carbon Steel

Steel is a versatile metal widely used in various industries, such as construction, automotive manufacturing, and aerospace. However, not all types of steel are created equal. Two of the most common steel types are mild steel and carbon steel. While they may seem similar, some key differences make them suitable for different applications. In this blog post, we’ll explore the differences between mild steel and carbon steel to help you choose the right type of steel for your project.

What is Mild Steel?

Mild steel is a low-carbon steel alloy composed primarily of iron (Fe), with small amounts of carbon (C) content, ranging from 0.05–0.3%. Mild steel has a relatively low tensile strength and is usually used in the construction industry for reinforcing structures such as bridges, railway lines and other structural components. The properties of mild steel include good resistance to corrosion due to its low carbon content and excellent weldability, thus making it easier to join different pieces together using welding or riveting techniques. Additionally, mild steels are malleable, making them ideal for forming components for various applications, including automotive and machinery parts.

What is Carbon Steel?

Carbon steel is an alloy of iron and carbon; the main component is carbon. It has been used in many applications due to its strength, hardness, and durability. Carbon steel usually contains other materials, such as manganese and sulfur, for particular purposes. It is often less expensive than stainless steel because it contains neither chromium nor nickel.

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Difference Between Mild Steel and Carbon Steel

The main differences between mild and carbon steels are their physical properties, chemical compositions, and applications.


The main difference between mild steel and carbon steel is their composition. Mild steel, also known as low-carbon steel, contains less than 0.30% carbon and is relatively inexpensive. Carbon steel, on the other hand, contains more carbon, usually between 0.50% to 2.0%, and has a higher price. The higher carbon content makes carbon steel harder and stronger than mild steel but also more brittle.

Strength and Durability

Due to its higher carbon content, carbon steel is stronger and more durable than mild steel. It is used in applications that require high strength and toughness, such as construction, oil and gas, and heavy machinery. Mild steel, on the other hand, is softer and more malleable, making it easier to work with and shape. It is commonly used in applications that require less strength, such as furniture, cookware, and light construction.


Another important difference between mild steel and carbon steel is their weldability. Mild steel can be easily welded using traditional welding techniques, such as arc welding, MIG welding, and TIG welding. Carbon steel, however, requires special welding techniques due to its higher carbon content. It is prone to cracking during welding, which can be prevented by using preheat and post-weld heat treatment.

Corrosion Resistance

Mild steel and carbon steel also differ in their corrosion resistance. Mild steel is prone to rust and corrosion, especially in humid and wet environments. It requires regular maintenance and painting to prevent corrosion. On the other hand, carbon steel has better corrosion resistance due to its higher carbon content and the addition of other alloying elements, such as chromium and nickel. It is commonly used in applications that require good corrosion resistance, such as marine equipment and pipelines.


Finally, mild steel is cheaper than carbon steel due to its lower carbon content and easier manufacturing process. It is widely used in everyday products and applications requiring low cost and strength. Carbon steel, on the other hand, has a higher price due to its higher carbon content and strength. It is used in applications requiring high strength and durability but also at a higher price.


In summary, mild steel and carbon steel are the most common types of steel used in various industries. They differ in composition, strength, durability, weldability, corrosion resistance, and cost. Choosing the right type of steel for your project is important based on your specific requirements and budget. Whether you need mild steel for furniture or carbon steel for construction, understanding these differences can help you make an informed decision and achieve the best results.



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