Ferrous Metals

Question 0

Effects of phosphorus

Answer 0

• increases strength and hardness

- decreases ductility and notch impact toughness

Question 1

Affect of manganese on iron

Answer 1

• better surface finish
• contributes to strength and hardness
• decreases ductility and weld ability

Question 2

Effects of silicon

Answer 2

• deoxidisers

- surface quality.

Question 3

Effects of chromium

Answer 3

• increases corrosion resistance
• increase harden ability
• improve high temp strength

Question 4

Effect of nickel

Answer 4

• increases strength
• increases harden ability
• increases impact strength

Question 5

Molybdenum

Answer 5

• enhances creep strength

- increases harden ability

Question 6

Aluminium

Answer 6

• deoxidiser

- controls grain growth

Question 7

Cast iron contains % carbon

Answer 7

2-6%

Question 8

Pig iron contains % carbon

Answer 8

4%

Question 9

Ferrite contains % carbon

Answer 9

0.006%

Question 10

Cementite contains % carbon

Answer 10

6.67%

Question 11

Case hardening carbon %

Answer 11

Increases to 0.83%

Question 12

Annealing define

Answer 12

• Makes steel soft, ductile and stress free

- slowly heated and slowly cooled

Question 13

Normalising define

Answer 13

• Heated slowly to above upper critical point
• cooled in the air
• restore toughness in heat or work hardened metal

Question 14

Hardening define

Answer 14

• heated to full annealing temp
• quenched for rapid cooling
• creation of martensite
• needs 0.4%<

Question 15

Tempering define

Answer 15

• Similar to normalising but hardness retained

- reduce the brittleness after hardening

Question 16

Cyanide hardening

Answer 16

• roughly 900 c
• for hardening layer of 0.1 to 0.25mm
• sodium cyanide

Question 17

Carbon content of low carbon steel

Answer 17

0.3%

Question 18

Carbon content of medium carbon steel

Answer 18

0.3 to 0.8%

Question 19

High carbon steel carbon content

Answer 19

0.8 to 1.7%