Development and application of fluorine-free mold powder for low carbon steel

Fluorine in mold powder is known as harmful to human health and the environment.Being the advocate of green production,Baosteel developed an environmentally friendly mold powder without fluorine.The main problem of fluorine-free flux film is small heat resistance and thus the heat transfer intensity of the mold is too large,which to some extent hinders the increase of the casting speed.With the heat flow simulation equipment,controlling precipitation of crystal in flux and solidification temperature properly,fluorine-free mold powder for low carbon steel,which substitutes F with B2O3,was successfully developed and applied in industrial production.The production results show that,by using boronic fluorine-free mold powder,the boron increment in molten steel is less than 1.3ppm for conventional aluminium killed low carbon steel.