6.1

Question 1

What is steel made from

Answer 1

Iron and Carbon

Question 2

What does CRES stand for

Answer 2

Corrosion resistant steel

Question 3

Low carbon steel

Answer 3

0.1-0.3%

Question 4

Medium carbon steel

Answer 4

0.3-0.5%

Question 5

High carbon steel

Answer 5

0.5-1.05%

Question 6

Sulphur

Answer 6

Decreases ductility

And weldability

Question 7

Manganese

Answer 7

Increases strength

Increase hardness

Question 8

Silicon

Answer 8

Deoxidiser

Remove impurities

Question 9

Phosphorus

Answer 9

Increases strength

Corrosion resistant

Question 10

Nickel

Answer 10

Improved hardness

Greater impact stress

Question 11

Chromium

Answer 11

Corrosion resistance

High temp strength

Question 12

Molybdenum

Answer 12

Impact strength

Creep strength

Question 13

Vanadium

Answer 13

Tensile strength

Yield strength

Question 14

Titanium

Answer 14

Toughness

Question 15

What is the primary hardening element in steel

Answer 15

Carbon

Question 16

Tempuring

Answer 16

Decrease hardness and increase ductility and toughness.

Heat Above critical limit and let to cool and then quenched

Only works for high carbon

Question 17

Hardening

Answer 17

Hearing above critical temp so carbon is dispersed evenly and uni formally. Then quickly quenched in oil water or brine.

Question 18

What is the quickest quenching fluid

Answer 18

Bribe

Question 19

What is the slowest quenching fluid

Answer 19

Oil

Question 20

Annealing

Answer 20

Increases softness and relives stresses.

Heated 50f above critical limit and soaked at this time for a set period. Slowly cooled naturally or in sand. Soft ductile metal

Question 21

What is normalising

Answer 21

Heated 100f above critical limit. And let to soak for a prescribed time and then cooled to room temp

Question 22

Properties of stainless steel

Answer 22

Corrosion resistant
Strong and tough at high temp
Identified by three digit code

Question 23

What are the disadvantages if steel

Answer 23

Hard to cut
Greater coefficient of expansion
Not suitable for high temp environment
Not heat treatable

Question 24

Austensitic

Answer 24

More refined grain structure 
Non magnetic 
200/300 series 
Cold worked 
Strain hardened 
Stabilising alloys

Question 25

Ferrstitic

Answer 25

Soft Magnetic Hot heat treats me Less workable

Question 26

Marsinsitic series

Answer 26

400 Heat treatable High carbon Least corrosion resistant

Question 27

What is used on landing gear in regards to steel

Answer 27

300m

Question 28

Hydrogen embrittlement

Answer 28

Hydrogen will react with carbon causing methane making cracks

Question 29

How to protect steel from corrosion

Answer 29

``` Cadmium bath Lead free paint Aluminium spray Chromium plate Nickel plate Silver plate (not in contact with Al) ```

Question 30

Case hardening

Answer 30

Hardening the outer layer

Question 31

When is case hardening suitable

Answer 31

Ferrous metals

Question 32

Carburising

Answer 32

Hardening for low carbon steel

Question 33

Pack carburising

Answer 33

Heating to 1700f whilst packed into a carbon rich material which. Penetrates the surface causing it to harden

Question 34

Gas carburising

Answer 34

Using a carbon rich gas to penetrate surface

Question 35

Liquid carburising

Answer 35

Hearing in a bath of sodium cyanide or barium cyanide

Question 36

Flame-hardening

Answer 36

Heated using Oct-acetylene flame and then immediately cooled by quenching in a jet of water

Question 37

Nitriding

Answer 37

Improved final surface and in an ammonia rich environment. The ammonia breaks the surface allowing nitrogen to penetrate