Mark the steel in which carbon `%` is highest

Options

A. Mild steel
B. Hard steel
C. Alloy steel
D. None of these

Answer

To determine which type of steel has the highest percentage of carbon, we can analyze the options provided:

1. **Mild Steel**: Mild steel typically contains a low percentage of carbon, generally around 0.05% to 0.25%. It is known for its ductility and malleability, making it suitable for various applications but not for high-strength requirements.

2. **Hard Steel**: Hard steel, also known as high-carbon steel, usually contains a higher percentage of carbon, typically ranging from 0.6% to 1.5% or even higher in some cases. This increased carbon content gives hard steel its hardness and strength, making it suitable for cutting tools and other applications requiring durability.

3. **Alloy Steel**: Alloy steel contains various alloying elements, such as chromium, nickel, and molybdenum, which can enhance its properties. The carbon content in alloy steels can vary widely, but it generally falls within the range of 0.5% to 1.5%. However, the exact carbon percentage depends on the specific alloying elements used.

4. **None of These**: This option suggests that none of the above steels have the highest carbon percentage, which we will evaluate based on the previous analysis.

**Conclusion**: Among the options provided, hard steel has the highest carbon percentage, typically ranging from 0.6% to 1.5% or more. Therefore, the correct answer is:

**Answer**: Option 2 - Hard Steel