To obtain steel entirely free from sulphur and phosphorus, the process used is

Options

A. Electrothermal process
B. Bessemer process
C. Open-hearth process
D. Duplex process

Answer

To obtain steel entirely free from sulfur and phosphorus, the following steps outline the process:

1. **Understanding the Impurities**: Steel often contains impurities such as sulfur and phosphorus, which can affect its properties. To produce high-quality steel, these impurities must be removed.

2. **Heating the Steel**: The first step in the process is to heat the steel. This is crucial because the heat helps in the removal of sulfur and phosphorus.

3. **Evaporation of Impurities**: As the steel is heated, sulfur and phosphorus are converted into gaseous forms. This transformation allows these impurities to be expelled from the steel.

4. **Electro-Thermal Process**: The specific method used to achieve this is known as the electro-thermal process. In this process, the heat is generated through electrical means, which is effective in removing the unwanted impurities.

5. **Conclusion**: Therefore, the correct answer to the question is the electro-thermal process, which effectively removes sulfur and phosphorus from steel.