Steel

Question 1

Beyond 2 % carbon in ferrous materials

Answer 1

Iron above steel below

Question 2

2-4% carbon

Answer 2

Cast iron

Question 3

4-4.5%

Answer 3

Pig iron

Question 4

Purest form of iron

Answer 4

Wrought Iron. Contains less than 0.05% C. Anything more. Not a steel

Question 5

Two major families of steel

Answer 5

Carbon and alloy

Question 6

Steel numbering

Answer 6

First two digits alloy group. The last 2 carbon content

Question 7

0.05-0.35% C

Answer 7

Low carbon steel. Lower strength and hardness

Question 8

0.35-0.50 % C

Answer 8

Medium Carbon steel. Balance of strength and duct. Good wear resistance. Stuctyre Al steel in category

Question 9

Examples of med-Carbon steel

Answer 9

Forging and high strength castings. Automotive part.

Question 10

Why higher Carbon steel can’t be welded?

Answer 10

The heat causes residual stress which will cause cracking. Oxygen-induced cracking. needs pre and post heating/cooling

Question 11

What is v crack of residual stress on steel called

Answer 11

HAZ( Heat Affected Zone)

Question 12

Stainless steel has a noticeable blank content.

Answer 12

Chromium content. minimum of 10 %

Question 13

Steels with additional elements added to increase properties

Answer 13

Alloy Steel

Question 14

What makes a steel corrosion resistant

Answer 14

high carbon and chromium content

Question 15

Stainless steel types

Answer 15

1. Austenitic 2. Super- Austentictic 3. Ferritic. 4. Duplex Steel. 5. Martensititc 6. Precitpation hardening Martensitic

Question 16

When you heat An Austentic iron above 1300” degrees

Answer 16

it changes between BCC to FCC stucure.

Question 17

Austnetic

Answer 17

High corrosion resitant. high chromium content

Question 18

Ferritic

Answer 18

Steel with high iron. lower corrosion res than other Stainless steel.

Question 19

Causes cracking in the welding process for mild carbon steels

Answer 19

Residual Stresses

Question 20

0.5 - 1.00 % C.

Answer 20

High cabron contnet. prosisblity of crackign and brittleness. Very hard and Very Strong after heat treatment

Question 21

Fewer alloys than other alloy steels. easily weldable. more corrosion resistant

Answer 21

Low Alloy Steel

Question 22

Steels that are well suited for making different tools and tool parts. High Strenght. Wear Strength.

Answer 22

Tool Steels

Question 23

two types of magnet

Answer 23

Temporary and permanent

Question 24

Spring steel

Answer 24

a stainless steel types

Question 25

two types of forging

Answer 25

Forging uses a deformation usually a hammer. Hot forging ( is heated at Recrytalization temp) while cold forging is at room temperature. Cold hardenes them and Heat forges.

Question 26

95 % of all metals produced in the world are these metals.

Answer 26

Iron and Steel

Question 27

Low iron ore like substance. Contains a percentage of magnetite Firing at high temperatures it oxides the magnetite into Hameitite.

Answer 27

Talconite. Talconite pellets

Question 28

Iron produced from a process getting rid the oxygen and oxides on the iron.

Answer 28

Direct Reduced Iron.

Question 29

A process that is used to remove the gangue or other impure minerals in metals
Steps Crushing then various processes of procceisn goremoving impurities.

Answer 29

Benefiticaiton

Question 30

Uses elecctrodes with Carbon and Man. to remove iron.

Answer 30

DirectElectirc arc iron