In general the special steels contain given alloying element

of which the solidification state is different from general carbon steel more easy to produce composition and structure segregation and surface crack of casting billet. Therefore it is necessary to increase cleanliness of liquid steel during special steel steel making

decrease inclusion content and improve inclusion morphology

and using low overheating liquid steel(10～15 ℃)casting and shielding casting technology to prevent liquid steel secondary oxidizing

decrease segregation of composition and structure of casting billet

increase surface quality and internal density of billet. the casting shielding technology

tundish metallurgy

electromagnetic stirring

soft reduction at solidification end

specific mold powder for special steel casting

and automation technique are presented

and the process parameters for special steel casting

existent issue and countermeasure are discussed in this article.