Bassemer converter is used in the refining of :

Options

A. pig iron
B. steel
C. wrought iron
D. cast iron

Answer

### Step-by-Step Solution:

1. **Understanding the Terms**:
- **Pig Iron**: This is the crude form of iron obtained from the blast furnace, containing about 4% carbon along with other impurities like sulfur, phosphorus, and silicon.
- **Cast Iron**: This is produced by melting pig iron and adding carbon, resulting in a material that has a lower carbon content than pig iron.
- **Wrought Iron**: This is a purer form of iron, produced by further refining cast iron in a reverberatory furnace. It has very low carbon content and is malleable.
- **Steel**: This is an alloy of iron with a small percentage of carbon (typically between 0.2% and 2.1%) and may include other elements like manganese.

2. **Identifying the Process**:
- The Bessemer converter is a method used to convert pig iron into steel. It works by blowing hot air through molten pig iron, which oxidizes the impurities present in the pig iron.

3. **Function of Bessemer Converter**:
- The Bessemer converter oxidizes impurities such as carbon, sulfur, and phosphorus from pig iron. This oxidation process removes these impurities, resulting in a purer form of iron, which is then transformed into steel.

4. **Conclusion**:
- Based on the above understanding, the Bessemer converter is specifically used in the refining of **steel** from pig iron.

### Final Answer:
The Bessemer converter is used in the refining of **steel**.

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