Question

Which of the following assumptions is not related to continuous casting?

• A. Solidification begins only when the metal reaches the secondary cooling zone
• B. The radial temperature gradient in the billet is linear
• C. The longitudinal heat flow in the billet is significant
• D. The metal is poured with zero superheat

Hint:

In continuous casting, always focus on radial thermal gradients and minimal longitudinal heat flow; the process emphasizes efficient heat extraction radially.

Answer 1

The Correct Option is C

In continuous casting, several thermal and metallurgical assumptions are considered: - Radial heat flow is predominant due to the geometry of billets and slabs. - Solidification starts quickly as the molten metal comes into contact with the mold and continues in the secondary cooling zone. - Typically, metal is poured with slight superheat to maintain fluidity and avoid premature solidification. - A linear radial temperature gradient is often assumed for simplification. However, assuming significant longitudinal heat flow contradicts the actual thermal behavior, as heat transfer along the length (longitudinal) is minimal compared to radial cooling.