Cold Worked Tool Steels

Question 1

Name the 3 sub types of cold worked steel

Answer 1

-3A Oil hardening
-3B air hardening
-3c high carbon high chromium

Question 2

(3A) What are the characteristics of?

Answer 2

-high machinability
-Low red hardness
-resists cracking on quenching

Question 3

(3A) what can this steel not be used for?

Answer 3

-oil hardened cannot be used for high speed cutting as the material will distort at temperatures approx higher than 200 degrees

Question 4

General characterisation for cold worked tool steels?

Answer 4

-high wear resistance
-high abrasion
-high toughness
-high impact resistance

Question 5

(3B) applications of air steels?

Answer 5

-blanking and forming dies
-intricate shapes due to little change after heat treat and quench

Question 6

In the order from best to worst, list the quenching methods

Answer 6

-Water
-Oil
-Air

Question 7

Applications of High carbon, high chromium ?

Answer 7

-Tube rolling mandrels
-blanking and piercing dies

Question 8

How are high carbon, high chromium steels cooled?

Answer 8

-usually by air but sometimes oil