Hardenabilty of steel.

[janmxx]

Hardenability of steel increases with carbon content. Why?
All alloying elements increase hardenability of steel except Cobalt? Why cobalt is different?

 

[metengr]

janmxx;
Go to the web site below, there is a good discussion on hardenability and effects of alloying elements in steel. There is plenty of information to review.

http://www.key-to-steel.com/default.aspx?ID=Articles