Quiz on Steel and Metal Properties

What is the carbon content range for mild steel used in construction works?

• 0.04-0.30%

• 0.30-0.70%

• 0.70-1.70%

• 1.80-4.00%

Which steel type has the highest yield strength among the following?

• Low carbon steel (200-300 MPa)

• Mild steel (300-350 MPa)

• Medium carbon steel (350-400 MPa)

• High strength steel (400-700 MPa)

What is a major limitation of mild steel?

• Excellent weldability

• Good wear resistance

• Poor corrosion resistance

• High strength

Medium carbon steel is primarily used for:

• Construction beams

• Railway rails and wheels

• Tin cans

• Automobile chassis

What treatment technique is used to improve mild steel's atmospheric corrosion resistance?

• Adding Niobium/Vanadium

• Adding Copper/Phosphorus (weathering steels)

• Adding Sulphur/Manganese

• Quenching and tempering

Annealing is primarily used to:

• Increase hardness

• Soften materials and relieve stress

• Increase wear resistance

• Improve electrical conductivity only

Which heat treatment technique involves rapid cooling from high temperatures?

• Annealing

• Tempering

• Quenching

• Aging

What happens to nonferrous alloys (aluminum, copper, nickel-based) when quenched?

• They become harder

• They become softer

• No change occurs

• They crack immediately

Case hardening is used to:

• Harden the entire material

• Improve surface hardness while maintaining bulk toughness

• Reduce carbon content

• Increase ductility throughout

Tempering is performed on steel to:

• Increase hardness only

• Remove all carbon content

• Provide toughness and ductility

• Achieve maximum brittleness