Taking the section size of a steel plant as the Φ800 mm round billet Q355NE as die research object

the heal transfer model was established to study the influence of casting speed and superheat on the solidification process without electromagnetic stirring of the crystalliser. The results showed that the effect of casting speed on thickness of blank shell

the position of solidification end and centre solid phase rate washigher than that of superheat

and the solidification end point- moved back about 2.6 m for each 0.02 m•min

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increased in the casting speed ； the solidification end pointmoved back- about 0.21 m for each 10 °C increased in superfieat. In actual producti

on

the thickness of the crystallizer billet shell exceeded 43 mm

when the specific water flow of secondary cooling tensity was 0.18 L•kg

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the superheat degree was 25 °C

and the casting speed was 0.14 m•min

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while the electromagnetic stirringat die ends can be allowed to play its full role

the processhas been improved.