Annealing & Normalising (MCQs + Notes)

Quick Notes

One-minute revision points

Use these before attempting the MCQs.

Annealing purpose

Main aim: soften steel and improve machinability, ductility, stress relief, and grain refinement.

Heating range

Hypoeutectoid: 30–50°C above upper critical temperature. Hypereutectoid: ~50°C above lower critical temperature.

Soaking + cooling

Carbon steels: soak ~5 min per 10 mm thickness. Cool slowly (about 100–150°C/hr) usually in the furnace.

Normalising

Heat ~30–40°C above upper critical temperature, then cool in still air to refine structure and remove internal defects.

MCQs

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1) What is the primary purpose of annealing steel?

A. Increase hardness

B. Soften the steel

C. Enhance corrosion resistance

D. Improve conductivity

2) What temperature range is typically used for annealing hypoeutectoid steels?

A. 100 to 200°C

B. 300 to 400°C

C. 30 to 50°C above upper critical temperature

D. 50 to 100°C above lower critical temperature

3) How long is the soaking duration at the heating temperature for carbon steels during annealing?

A. 1 minute per 10 millimeter of thickness

B. 5 minutes per 10 millimeter of thickness

C. 10 minutes per 5 millimeter of thickness

D. 15 minutes per 5 millimeter of thickness

4) What is the cooling rate for carbon steel during the annealing process?

A. 50 to 100°C/hr

B. 100 to 150°C/hr

C. 200 to 250°C/hr

D. 300 to 350°C/hr

5) What temperature range is used for normalizing steel components?

A. 100 to 200°C

B. 300 to 400°C

C. 30 to 40°C above the upper critical temperature

D. 50 to 100°C above the lower critical temperature

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