Science Steel

What is steel made of?

• Iron and Zinc

• Zinc and Carbon

• Iron and Carbon

• Iron and Aluminium

What is the carbon content of cast iron?

• 0.15%

• 0.15% - 0.25%

• 0.50% - 1.50%

• 3% - 4%

Which of the following is the result of a reduction in pearlite percentage of steel?

• High yield strength

• An increase in tensile strength

• No significant effect on the yield strength

• A rise in the impact transition temperature

Which of the following describes high carbon steel?

• 0.15%

• 0.15% - 0.25%

• 0.50% - 1.50%

• 3% - 4%

Why is steel economical?

• Due to its many applications

• Due to its uniform properties

• Due to its availability around the world

• Due to its high strength-to-weight ratio

In the periodic table, what is the symbol of iron?

• I

• Rn

• Fe

• Fr

Which statement of heat treatment is correct for annealing?

• Strengthens the steel

• Cooled at a very fast rate

• Temperature below 700°C

• Internal stresses are removed

Tags

NGSS.HS-PS3-4

What is the process if the steel is heated above critical temperature, but more rapid cooling in air?

• Welding

• Soldering

• Annealing

• Normalizing

Which heat treatment gives hardened steel increased in ductility with only slight loss of strength?

• Soldering

• Annealing

• Normalizing

• Quenching and Tempering

Identify the THREE (3) tensile properties of mild steel from the stress-strain curve above in correct order.

• Yield point, Ultimate strength, Breaking point

• Yield point, Breaking point, Ultimate strength

• Breaking point, Yield point, Ultimate strength

• Breaking point, Ultimate strength, Yield point