---
title: "Ferrous and non-ferrous products"
subject: "Civil Engineering Materials"
chapter: 8
key: "semester_3/civil_engineering_materials:ferrous-nonferrous-merits"
source: https://www.bctengineer.com/q/semester_3/civil_engineering_materials/ferrous-nonferrous-merits
site: BCT Engineering
---

# Ferrous and non-ferrous products

Civil Engineering Materials · Chapter 8: Metals and Alloys

- Asked in: 2076 Chaitra, 3 marks
- Video: [What are Ferrous and Non-Ferrous metals? Types of metals (Metal technology)](https://www.youtube.com/watch?v=i8Nc12SkJsY) — Toolengineering
- Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_3/civil_engineering_materials/ferrous-nonferrous-merits
- Whole chapter: https://www.bctengineer.com/md/semester_3/civil_engineering_materials/chapter-8

## Question

Explain various ferrous and non-ferrous products used in construction and explain their merits and demerits.

## Short answer

Ferrous products (cast iron, mild steel rebars, structural sections) offer high strength, ductility, weldability, low cost, but corrode and lose strength in fire. Non-ferrous products (aluminium windows, copper wires, zinc galvanising) are corrosion resistant, light, good conductors, low maintenance, but costly with lower strength. Lead is toxic.

## Answer

#### Ferrous products (iron base)
Cast iron, wrought iron, mild steel, high carbon and alloy steels: reinforcement bars, structural sections, plates, pipes, columns, wires, nails, bolts, GI sheets.
- **Merits:** high strength, ductility, toughness, easy to weld and fabricate, recyclable, relatively cheap.
- **Demerits:** corrode (rust) and need painting/galvanising, heavy, lose strength in fire, magnetic.

#### Non-ferrous products
Aluminium, copper, zinc, lead, tin, brass, bronze: windows and doors, roofing, wires, pipes, fittings, flashing, galvanising, ornamental work.
- **Merits:** light, corrosion resistant, good conductors, easy to work, attractive appearance, low maintenance.
- **Demerits:** costly, lower strength than steel, aluminium has a lower stiffness and melting point, and some (lead) are toxic.

## Check yourself

The answer's key points as multiple-choice questions, with the correct option and why.

1. Which is a merit of ferrous products?
   A. Immune to rust
   B. High strength, ductility, easy to weld and relatively cheap
   C. Very light
   D. Non-magnetic
   Answer: B. Ferrous metals are strong, ductile, weldable, recyclable and relatively cheap. (Key point: Ferrous merits)

2. Which is a demerit of ferrous products?
   A. Low strength
   B. Poor weldability
   C. They corrode and need protection, are heavy and lose strength in fire
   D. Expensive compared with all non-ferrous metals
   Answer: C. Steel rusts, is heavy and weakens in fire. (Key point: Ferrous demerits)

3. Which pair correctly summarises non-ferrous products?
   A. Merit: higher strength than steel; demerit: rusts
   B. Merit: light and corrosion resistant; demerit: costly and lower strength than steel
   C. Merit: cheap; demerit: magnetic
   D. Merit: strongest; demerit: heavy
   Answer: B. Non-ferrous metals are light and low maintenance but costly and weaker; lead is toxic. (Key point: Non-ferrous merits and demerits)

## Related in Civil Engineering Materials

- [Non-ferrous metals properties and uses](https://www.bctengineer.com/question.md?key=semester_3%2Fcivil_engineering_materials%3Anon-ferrous-metals-properties-uses) — Civil Engineering Materials, chapter 8
- [Ferrous versus non-ferrous](https://www.bctengineer.com/question.md?key=semester_3%2Fcivil_engineering_materials%3Aferrous-vs-nonferrous) — Civil Engineering Materials, chapter 8
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