Metallurgy

Question 1

Metals have iron as the major ingredients and are usually magnetic

Answer 1

Ferrous metals

Question 2

Metals that do not have iron in large enough amount to have any major influence on the properties of metals

Answer 2

Non-ferrous metals

Question 3

What is the most practical method of identifying a metal?

Answer 3

by visual appearance, texture and color

Question 4

What are the most important properties to consider for metals?

Answer 4

• hardness
• ductility
• toughness
• tensile strength
• machinability

Question 5

The ability of a metal to resist penetration and plastic deformation?

Answer 5

hardness

Question 6

The ability of a metal to deformed permanently without breaking?

Answer 6

ductility

Question 7

The ability of a metal to withstand shock and impact without breaking or shattering is?

Answer 7

toughness

Question 8

The ability of a metal to withstand pull without breaking is?

Answer 8

tensile strength

Question 9

The ease at which you can cut and shape a metal is known as?

Answer 9

machinability

Question 10

The most common metal material is?

Answer 10

carbon steel

Question 11

What is the most common material used in the industry?

Answer 11

aluminium

Question 12

If a piece of a metal has a smooth outer surface, what might you conclude about the object?

Answer 12

it has been formed

Question 13

If an object is irregularly shaped, what might you conclude the object?

Answer 13

it is a casting

Question 14

What are the different ways of identifying metals?

Answer 14

• color
• visual appearance
• weight
• texture
• shape

Question 15

Given two identical pieces of metals, zinc dye cast and aluminium, what would be the simplest way to identify them?

Answer 15

by their weight

Question 16

How can you distinguish between hot rolled and cold rolled steel?

Answer 16

*Hot rolled steel has a black mill scale or a heat scale surface

Question 17

List all carbon steel sub-groups

Answer 17

• low carbon
• medium carbon
• high carbon

Question 18

What are the two (2) main divisions of metals?

Answer 18

• Ferrous Metals

* Non-Ferrous Metals

Question 19

Low carbon steel has

Answer 19

.02 - .30 % carbon

Question 20

Medium carbon steel has

Answer 20

.30 - .60 % carbon

Question 21

High carbon steel has

Answer 21

anything over .60%

Question 22

What is considered to be cast iron?

Answer 22

Anything over 1.7%

Question 23

The three special types of allow steel are?

Answer 23

• high strength low allow steel (HSLA)
• quench and temper structural steel
• maragine steel

Question 24

What are the two types of high speed steel?

Answer 24

• tungsten (Type-T)

* molybdenum (Type-M)

Question 25

What are the three types of stainless steel?

Answer 25

• austenitic stainless steel
• ferritic stainless steel
• martensitic stainless steel

Question 26

The two principal alloy for copper are?

Answer 26

• brass

* bronze

Question 27

A mixture of copper and zinc makes

Answer 27

Brass

Question 28

A combination of copper and tin is?

Answer 28

Bronze

Question 29

The principal types of bronze are?

Answer 29

• phosphor-bronze
• silicon line bronze
• aluminium line bronze
• beryllium bronze

Question 30

The structure of soft steel is called?

Answer 30

Pearlite

Question 31

Ferrite is?

Answer 31

pure iron

Question 32

What is cementite type?

Answer 32

Is a carbide compound form from iron and carbon

Question 33

The precise amount of ferrite and cementite depends on?

Answer 33

the percentage of carbon in the steel

Question 34

The basic heat treating processes for steel are?

Answer 34

• hardening
• tempering
• annealing
• normalizing

Question 35

The proper hardening temperature is reached when the work piece is?

Answer 35

Cherry red color

Question 36

How is tempering done?

Answer 36

immediately after hardening or it will crack

Question 37

You can achieve a more control temper by?

Answer 37

heating the work piece in oil, sand, salt, or lead bath

Question 38

What are the sub-groups of which metals belong to?

Answer 38

• carbon steel
• alloy steel
• tool steel or high speed steel
• stainless steel
• aluminium and its alloys
• copper and its alloys
• cast iron

Question 39

When the heat code identification number is cut from a piece of plate, what should you do?

Answer 39

Transfer the id number to the remaining plate

Question 40

What is the most precise method for the identification of a metal that has been shipped from a steel mill?

Answer 40

study the mill test report

Question 41

In addition to the mill test report what else do steel mills usually attached to the straps that holds the bundles of bar stock together

Answer 41

Metal specification tags

Question 42

The lower critical temperature of steel is always at around?

Answer 42

1333°F or 723°C

Question 43

Which element found in some copper alloy is a significant health hazard?

Answer 43

Beryllium

Question 44

What are the two types of hardness testing?

Answer 44

• rockwell hardness testing

* brinell hardness testing

Question 45

If you are told a work piece has a rockwell C-65, what would that mean

Answer 45

it has been hardened

Question 46

When distortion from heat treatment must be kept to a minimum, which type of steel should be use?

Answer 46

Air hardening steel

Question 47

Tubing is sized according to its

Answer 47

outside diameter