Question:
As per the Ugine-Sejournet process, the lubricant most commonly used for high-temperature extrusion is
As per the Ugine-Sejournet process, the lubricant most commonly used for high-temperature extrusion is
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Glass lubrication is essential in hot extrusion of steels and superalloys.
Updated On: Jun 29, 2026
- Molten glass
- Oil
- Soap solution
- Solid wax
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The Correct Option is A
Solution and Explanation
Concept:
Ugine-Sejournet process is a hot extrusion process used for difficult-to-deform metals. At high temperatures, conventional lubricants fail.
Thus, special lubricants like molten glass are used.
Step 1: Need for special lubricant.
At high temperature:
• friction is extremely high
• oxidation occurs
• die wear increases
Step 2: Role of molten glass.
Molten glass:
• forms protective film
• reduces friction
• prevents oxidation
• withstands high temperature Final Answer: \[ \boxed{\text{Molten glass}} \]
Step 1: Need for special lubricant.
At high temperature:
• friction is extremely high
• oxidation occurs
• die wear increases
Step 2: Role of molten glass.
Molten glass:
• forms protective film
• reduces friction
• prevents oxidation
• withstands high temperature Final Answer: \[ \boxed{\text{Molten glass}} \]
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