How are ferrous and non-ferrous metals categorised, and what properties decide their use?
The categorisation of ferrous and non-ferrous metals, including mild steel, stainless steel, cast iron, aluminium, copper and brass, and the properties of ductility, malleability and hardness that decide their use.
A focused answer to Edexcel GCSE Design and Technology 1.8 on metals, covering ferrous metals (mild steel, stainless steel, cast iron), non-ferrous metals (aluminium, copper, brass) and the properties of ductility, malleability and hardness.
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What this dot point is asking
This is Edexcel key idea 1.8, the categorisation of metals. Edexcel wants you to apply knowledge of the working properties, characteristics, applications, advantages and disadvantages of ferrous and non-ferrous metals so you can discriminate between them and select appropriately. This is one of the six material groups in Topic 1 core content, examined as recall (naming metals and groups) and Explain questions justifying a metal for a product. The same metals appear in greater depth in the Metals material category (Section B) if your school chose it.
Ferrous metals
- Mild steel: iron with a low carbon content. Cheap, strong, tough and easy to work, used for car bodies, frames and tools, but rusts and must be painted or coated.
- Stainless steel: steel with chromium (and often nickel) added. The chromium forms a protective oxide layer, so it resists rust, used for cutlery, sinks and surgical tools. Still ferrous because it is iron-based.
- Cast iron: iron with a high carbon content. Very hard and good in compression, used for machine bases, manhole covers and cookware, but brittle, so it cracks under impact.
Non-ferrous metals
- Aluminium: light, soft, corrosion-resistant and a good conductor, used for aircraft parts, drinks cans and cooking foil. Low density gives a good strength-to-weight ratio when alloyed.
- Copper: an excellent electrical and thermal conductor, very ductile and malleable, used for wiring, pipes and heat exchangers. Corrosion-resistant but relatively expensive.
- Brass: an alloy of copper and zinc. Harder and more machinable than copper, corrosion-resistant and attractive, used for fittings, valves and decorative ware.
Properties that decide the use
A metal is chosen by matching its properties to the product: copper for wire (ductile, conductive), stainless steel for cutlery (hard, corrosion-resistant), aluminium for a drinks can (light, malleable, corrosion-resistant), cast iron for a machine base (hard, good in compression). The skill is naming the property and tying it to the demand.
Exam-style practice questions
Practice questions written in the style of Pearson Edexcel exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
Edexcel 20214 marksExplain the difference between a ferrous and a non-ferrous metal, and give one named example of each. (4 marks)Show worked answer →
A 4-mark question gives 2 marks for the distinction and 2 for valid examples.
A ferrous metal contains iron (1) and, because of the iron, will rust (oxidise) when exposed to moisture and oxygen unless it is protected or alloyed. Examples are mild steel, cast iron and stainless steel (1, for a valid ferrous example).
A non-ferrous metal contains no iron (1), so it does not rust in the same way and is generally more corrosion-resistant. Examples are aluminium, copper and brass (1, for a valid non-ferrous example).
Markers reward the iron distinction (and that ferrous metals rust) plus a correct example of each. Note stainless steel is still ferrous, despite resisting rust, because chromium is added to iron-based steel. Naming stainless steel as non-ferrous is a common error.
Edexcel 20223 marksExplain why copper is chosen for the wiring inside an electrical plug. (3 marks)Show worked answer →
A 3-mark Explain rewards properties tied to the use.
Copper is an excellent electrical conductor (1), so it carries current with little resistance and little energy loss as heat, which is essential for safe, efficient wiring. It is also highly ductile (1), so it can be drawn out into thin, long, flexible wires without breaking. It resists corrosion as a non-ferrous metal (1), so the connection stays reliable over time.
Markers reward (1) high electrical conductivity, (2) ductility for drawing into wire, (3) corrosion resistance or another valid property. Confusing conductivity with strength, or saying copper is chosen because it is hard, loses marks.
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Sources & how we know this
- Pearson Edexcel GCSE (9-1) Design and Technology (1DT0) specification — Pearson Edexcel (2022)