Question:
The concept of vacuum degassing was initially introduced primarily for removal of:
The concept of vacuum degassing was initially introduced primarily for removal of:
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Vacuum reduces gas solubility, especially hydrogen in molten steel.
Updated On: Jun 29, 2026
- Hydrogen in liquid steel
- Sulphur in liquid steel
- Carbon in liquid steel
- Manganese in liquid steel
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The Correct Option is A
Solution and Explanation
Concept:
Vacuum degassing is a secondary steelmaking process used to:
- remove dissolved gases
- improve steel quality
- reduce hydrogen-related defects
Step 1: Effect of vacuum.
Under vacuum: - solubility of gases decreases - hydrogen escapes from molten steel
Step 2: Primary objective.
Main purpose: \[ \text{Removal of dissolved hydrogen} \] Hydrogen causes: - flaking - embrittlement
Step 3: Evaluate options.
(A) Hydrogen → correct (B) Sulphur → removed by slag refining (C) Carbon → vacuum aids but not primary purpose (D) Manganese → not removed Final Answer: \[ \boxed{\text{Hydrogen in liquid steel}} \]
Step 1: Effect of vacuum.
Under vacuum: - solubility of gases decreases - hydrogen escapes from molten steel
Step 2: Primary objective.
Main purpose: \[ \text{Removal of dissolved hydrogen} \] Hydrogen causes: - flaking - embrittlement
Step 3: Evaluate options.
(A) Hydrogen → correct (B) Sulphur → removed by slag refining (C) Carbon → vacuum aids but not primary purpose (D) Manganese → not removed Final Answer: \[ \boxed{\text{Hydrogen in liquid steel}} \]
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