What is the Difference Between Low Carbon Steel and High Carbon Steel?

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The main difference between low carbon steel and high carbon steel lies in their carbon content, which affects their properties, such as strength, hardness, ductility, and malleability. Here are the key differences between the two:

  • Carbon Content: Low carbon steel, also known as mild steel, contains 0.05% to 0.32% carbon, while high carbon steel contains 0.60% to 1.5% carbon.
  • Strength and Hardness: High carbon steel is stronger and harder than low carbon steel due to its increased carbon content. However, this also makes high carbon steel more brittle compared to low carbon steel.
  • Ductility and Malleability: Low carbon steel is more ductile and malleable than high carbon steel, which means it can be easily shaped and formed. High carbon steel, on the other hand, is less ductile and more difficult to work with.
  • Cost-effectiveness: Low carbon steel is generally more cost-effective than high carbon steel.
  • Applications: Low carbon steel is commonly used in applications that require high degrees of ductility, such as sheet metal, wiring, and automotive parts. High carbon steel is typically used in cutting tools, knives, springs, and hand tools, where strength and hardness are more important than ductility.

In summary, the choice between low carbon steel and high carbon steel depends on the specific requirements of an application, taking into account factors such as strength, hardness, ductility, and toughness.

Comparative Table: Low Carbon Steel vs High Carbon Steel

Here is a table comparing the differences between low carbon steel and high carbon steel:

Property Low Carbon Steel (< 0.30% carbon) High Carbon Steel (> 0.60% carbon)
Carbon Content 0.05% to 0.32% 0.61% to 1.5%
Strength Lower Higher
Hardness Lower Higher
Ductility Higher Lower
Malleability Higher Lower
Toughness Lower Higher
Corrosion Resistance Poor Better
Shear Modulus 11300 – 12000 ksi 11300 – 12000 ksi
Melting Point 2,800-2,900°F 2,800-2,900°F
Thermal Conductivity 1132 – 361 BTU-in/hr-ft²-°F 1132 – 361 BTU-in/hr-ft²-°F

Low carbon steel, also known as mild steel, has a low ratio of carbon to iron compared to other steel types, typically with a carbon content of 0.05% to 0.32% by weight. It is more ductile, malleable, and tough, but has lower strength and hardness. High carbon steel, on the other hand, is also known as carbon tool steel and has a carbon content of 0.61% to 1.5%. It is stronger, harder, and more brittle, but has lower ductility and malleability.