1.2-Performance characteristics of metals

Question 1

Sheet stock form

Answer 1

large sections of metalin varying thicknesses from less than 1mm to approximately 4mm

Question 2

Plate stock form

Answer 2

thicker than 3mm and narrower than sheet metals

Question 3

Bar stock form

Answer 3

solid form, flat bar, square bar, round bar or hexagonal bar

Question 4

Tube form stock form

Answer 4

hollow in cross section and can be square, rectangular, round, or hexagonal

Question 5

Structural angular stock form

Answer 5

Shapes such as H beams, L beams, I beams, tee bar and channel

Question 6

Characteristics of metal

Answer 6

• naturally occurring material
• 25% of earth’s crust made of metal ores
• bauxite is the main one
• raw material is extracted from the ore through a combinatiom of crushing, smelting or heating, with the addition of chemicals and energy
• most metals can be recycled

Question 7

Copper ore

Answer 7

Chalcopyrite

Question 8

Aluminium ore

Answer 8

Bauxite

Question 9

Tin ore

Answer 9

Cassiterite

Question 10

Zinc ore

Answer 10

Zinc blende

Question 11

3 categories of metals

Answer 11

• ferrous- contains iron and carbon
• non ferrous- no iron
• alloy- made of two or more metals or combining two or more elements

Question 12

Non ferrous metal ALUMINIUM- properties and uses

Answer 12

• lightweight
• ductile
• malleable
• drinks cans, baking foil

Question 13

Non ferrous metal COPPER- properties and uses

Answer 13

• corrosion resistant, good electricl and thermal conductor

- electrical wire, water pipes

Question 14

Non ferrous metal ZINC- properties and uses

Answer 14

• low melting point, good corrosion resistance

- galvanising steel as protective coating for buckets

Question 15

Non ferrous metal SILVER- properties and uses

Answer 15

• malleable, ductile, corrosion resistamt

- jewellery, cutlery

Question 16

Non ferrous metal GOLD- properties and uses

Answer 16

• malleable, ductile, corosion resistant

- jewellery, electrical components

Question 17

Non ferrous metal TITANIUM- properties and uses

Answer 17

• hard, similar strength to steels but more lightweight

- hip replacements, aircraft, golf clubs

Question 18

Non ferrous metal TIN- properties and uses

Answer 18

• ductile, malleable, low melting point

- soft solder, coating for food cans

Question 19

Ferrous metal LOW CARBON STEEL- properties and uses

Answer 19

• ductile, high tensile strength, tough, malleable

- nuts, bolts, washers

Question 20

Ferrous metal MEDIUM CARBON STEEL- properties and uses

Answer 20

• higher than low carbon steel but less ductile and tough

- springs, gardening tools

Question 21

Ferrous metal CAST IRON- properties and uses

Answer 21

• hard outer skin but brittle core, good under compression

- disc brakes, machine parts

Question 22

Ferrous alloys STAINLESS STEEL- properties and uses

Answer 22

• tough, hard, corrosion resistant

- sinks, kitchenware

Question 23

Ferrous alloys HIGH SPEED STEEL- properties and uses

Answer 23

• hard, tough, high level of resistance to frictional heat

- tool blades, drill bits, milling cutters

Question 24

Ferrous alloys DIE STEEL- properties and uses

Answer 24

• hard, tough

- blanking punches and dies

Question 25

Non ferrous alloys BRASS- properties and uses

Answer 25

• corrosion resistant, gold electrical and thermal conductor

- boat fittings, door furniture

Question 26

Non ferrous alloys BRONZE- properties and uses

Answer 26

• tough, corrosion resistant

- statues, coins, bearings

Question 27

Non ferrous alloys DURALUMIN- properties and uses

Answer 27

• equivelent strength properties to mild steel but more lightweight
• becomes harder as worked
• aircraft parts, vehicle parts

Question 28

Non ferrous alloys PEWTER- properties and uses

Answer 28

• malleable, low melting point, casts well

- tankards, flasks, goblets