Properties and uses of different kinds of steel
4 marks · NormalThe properties of different steels determine their uses.
Explain why mild steel is used for car bodies.
Explain why high-carbon steel is preferred for cutting tools rather than mild steel.
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(a) Mild steel is strong and malleable so it can be formed into car body shapes. However, it is not too hard and is easier to shape than high-carbon steel.
(b) High-carbon steel is harder and more resistant to wear, which makes it suitable for cutting tools where a sharp edge is needed, unlike mild steel which would wear out quickly.
Common mistakes: Giving properties but not linking to use
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Marking points
M1 (a) · 1 mark · Links mild steel's strength or malleability to being shaped for car bodies or similar use.
A1 (a) · 1 mark · Mentions mild steel is easier to shape than high-carbon steel or another logical reason.
M2 (b) · 1 mark · States high-carbon steel is hard or resistant to wear.
A2 (b) · 1 mark · Links to the requirement of cutting tools needing a sharp edge or durability.
Worked solution
a) Mild steel is used for car bodies because it is malleable, so it can be pressed into complex shapes, and strong enough to provide structure and safety.
b) High-carbon steel is harder and more resistant to wear than mild steel, so it is suitable for cutting tools; the hardness is needed for maintaining a sharp edge.