Metals

Question 1

What is a ferrous metal?

Answer 1

• most consist of iron
• prone to rusting if exposed to moisture
• can be picked up by a magnet

Question 2

Properties + uses of Mild Steel

Answer 2

Properties
- iron mixed with 0.2% carbon
- ductile + malleable
- will rust frequently in contact with water
Uses
- nuts + bolts
- buildng girders
- car bodies
- gates

Question 3

Properties + uses of Carbon Steel

Answer 3

Properties
- iron mixed with 1.5% carbon
- very strong + very hard
- resistant to abrasion
Uses
- hand tools e.g. screwdrivers, hammers, saws

Question 4

Properties + uses of Cast Iron

Answer 4

Properties
- very strong in compression
- very brittle
Uses
- car brake discs
- car cylinders
- manhole covers

Question 5

What is a non-ferrous metal

Answer 5

• don’t contain iron
• not attracted to magents
• don’t rust when exposed to moisture

Question 6

Properties + uses of Aluminum

Answer 6

Properties
- light colour, can be polished
- very lightweight
Uses
- saucepans
- cooking foil
- bicycles

Question 7

Properties + uses of Copper

Answer 7

Properties
- ductile + malleable
- red/brown colour
- very god heat + electrical conductor
Uses
- plumbing
- electrical components
- cookware

Question 8

Properties + uses of Zinc

Answer 8

Properties
- very resistant to corrosion from moisture
- weak material
Uses
- coating on screws
- american cents
- galvanise steel

Question 9

Properties + uses of Tin

Answer 9

Properties
- very ductile + malleable
- resistant to corrosion from moisture
- bright silver
Uses
- coating on food cans
- whistles
- tin foil
- soldering

Question 10

What is an alloy?

Answer 10

• cotains two or more different metals
• occassionally other elements

Question 11

Properties + uses of Stainless Steel

Answer 11

Properties
- alloy of iron + 18% chromium, 8% nickel, 8% magnesium
- very resistant to wear + water corrosion + rust
Uses
- kitchen sinks
- cutlery
- surgical instruments

Question 12

Properties + uses of Duralumin

Answer 12

Properties
- excellent strength to weight ratio
- extremely hard + tough
- machines + casts well
- can suffer from erosion
- can become brittle thrrough fatigue
Uses
- aircraft + vehicle structure
- precision tools
- bike + engine parts

Question 13

Properties + uses of Brass

Answer 13

Properties
- 65% copper, 35% zinc
- cast + machined then plated
Uses
- decorative metal work
- door handles
- musical instruments