Water Hardneed Steels

Question 1

Characteristics of Water hardened steels?

Answer 1

-HIGH tensile strength & hardness levels

-LOW ductility & toughness values

-POOR harden-ability

Question 2

What inhibits Pearlite Formation?

Answer 2

-Presence of chromium increases hardness and harden-ability

Question 3

What is added to inhibit grain growth?

Answer 3

-Vanadium is added to inhibit grain growth

-Pins grain boundaries increasing hardness and wear resistance

Question 4

Name 4 applications of water hardened steels

Answer 4

-forging & hand hammers
-forging, bending and cutting dies
-blanking & bending tools
-chisels, scissors, knives

Question 5

Name another 4 applications of water hardened tool steel?

Answer 5

-milling cutter
-lathe centre
-watchmakers tools
-engraving tools

Question 6

What is the aim of sphearodizatiion annealing?

Answer 6

-minimum hardness
-maximum ductility
-maximum machinability
-maximum softness

Question 7

What does sphearodizatiion annealing do to the material composition?

Answer 7

Breaks up the pearlitic and cementite network