mcq2-17

What is the primary purpose of tempering steel after hardening?

• Increase brittleness
• Relieve internal stresses
• Decrease toughness
• Induce full hardness

What temperature range is typically used for tempering steel?

• 100-200°C
• 400-500°C
• 700-800°C
• 200-300°C

Why is the soaking period at the tempering temperature important?

• It increases hardness
• It prevents cooling
• It relieves internal stresses
• It decreases toughness

What color indicates the tempering temperature of around 230°C?

• Pale straw
• Dark blue
• Red brown
• Greyish blue

Which property of steel does tempering help to restore?

• Hardness
• Brittleness
• Ductility
• Internal stresses