"Commonly killed steels include alloy
steels,[3]stainless steels,[3]
heat resisting steels,[3]
steels with a carbon content greater than 0.25%, steels used for forgings,
structural steels with a carbon content
between 0.15 and 0.25%, and some special steels in the lower carbon
ranges.[4]
It is also used for any steel
castings.[5]
Note that as the carbon content decreases the greater the problems with
non-metallic inclusions.[6]