Metals

Question 1

What is the general relationship between the complexity of stock forms and their cost?

Answer 1

The more complex the stock form or the more material the stock form contains, the more expensive it is.

Question 2

What is the thickness range of sheet metal?

Answer 2

Less than 1 mm up to approximately 3 mm.

Question 3

How is plate metal defined in terms of thickness?

Answer 3

Thicker than 3 mm and narrower than sheet metals.

Question 4

What are the different forms of bar metal?

Answer 4

• Solid form
• Flat bar
• Square bar
• Round bar
• Hexagonal bar

Question 5

What is the cross-section shape of tube metal?

Answer 5

Hollow in cross-section and can be square, rectangular, round, or hexagonal.

Question 6

What types of structural angular shapes are included in metal stock forms?

Answer 6

• H beams
• L beams (angle)
• I beams
• Tee bar
• Channel

Question 7

What is metal, in terms of its natural occurrence?

Answer 7

A naturally occurring material mined from the ground in the form of ore.

Question 8

What percentage of the Earth’s crust is made up of metal ores?

Answer 8

Approximately 25 percent.

Question 9

What is the most common ore from which aluminium is made?

Answer 9

Bauxite.

Question 10

What processes are involved in extracting raw metal from ore?

Answer 10

• Crushing
• Smelting
• Heating
• Addition of chemicals
• Huge amounts of electrical energy

Question 11

Why can metals be easily recycled?

Answer 11

Due to their low melt point.

Question 12

What ore is copper extracted from?

Answer 12

Chalcopyrite.

Question 13

What ore is aluminium extracted from?

Answer 13

Bauxite.

Question 14

What ore is tin extracted from?

Answer 14

Cassiterite.

Question 15

What ore is zinc extracted from?

Answer 15

Zinc blende.

Question 16

What are the three main categories of metals?

Answer 16

• Ferrous metal
• Non-ferrous metal
• Alloy

Question 17

What defines a ferrous metal?

Answer 17

A metal containing mostly iron and carbon.

Question 18

What defines a non-ferrous metal?

Answer 18

A metal that does not contain iron.

Question 19

What is an alloy?

Answer 19

A metal made of two or more metals, or combining two or more elements, one of which must be a metal.

Question 20

Properties of copper ?

Answer 20

• ductile
• malleable
• good electrical and thermal conductor
• soldered

Question 21

Properties of aluminium ?

Answer 21

• light weight
• ductile
• malleable
• corrosion resistant
• electrical an thermal conductor

Question 22

Properties of zinc ?

Answer 22

• low mp
• good corrosion resined

Question 23

Properties of silver ?

Answer 23

• malleable
• ductile
• corrosion resistant

Question 24

Properties of gold ?

Answer 24

• malleable
• ductile
• corrosion resistant

Question 25

Properties of titanium

Answer 25

- hard similar strength to steel - high resistance to corrosion - lightweight

Question 26

Properties of tin ?

Answer 26

- ductile - malleable - low mp - corrosion resistant

Question 27

Properties of low carbon steel

Answer 27

- ductile - high tensile strength - tough A malleable - poor resistance to corrosion 0.15 to 0.3 carbon content

Question 28

Properties of medium carbon steel ?

Answer 28

- harder than low carbon steel - less ductile than lcs - 0.3 to 0.7 carbon content

Question 29

Properties of cast iron

Answer 29

- hard outer skin but brittle core - good under compression - 3,5 percent of carbon

Question 30

Properties of stainless steel

Answer 30

- corrosion resistant - tough - hard

Question 31

Properties of high speed steel ?

Answer 31

- hard - high level of resistance to frictional heat - tough

Question 32

Properties of die steel

Answer 32

Hard and tough

Question 33

Properties of bronze ?

Answer 33

- tough - corrosion resistance - cast Copper and tin

Question 34

Properties of brass

Answer 34

- cr - good electrical and thermal conductor Copper and zinc

Question 35

Properties of pewter

Answer 35

- low mo and malleable

Question 36

Dueal