Slag pots and the casting technology of the slag tank

Slag pots are an important equipment in steelmaking production.  It is a kind of container used to hold high temperature molten slag produced in the process of iron and steel smelting.  It has bowl-shaped containers with hoisting earshafts on both sides.  The slag tank purchased by metallurgical enterprises generally adopt traditional casting technology, with long manufacturing cycle, short service life and large number of scrap, while Kunfeng heavy Industry increases innovation in slag pots production.  the slag pots has the advantages of short casting period, long service life and strong anti-deformation ability.

Slag tank is one of the auxiliary equipment in metallurgical industry, which is used to hold steel slag and waste during steelmaking and ironmaking.  The traditional material is gray cast iron, and nodular cast iron has been widely used in recent years.

When the slag pots are used, the slag pots are in direct contact with steel slag to withstand high temperature baking, steel slag temperature, abnormal breakout to undertake molten steel.  Under normal circumstances, the load of slag tank is self-weight and slag weight, and the load increases sharply during breakout.  Once the steel is glued to the can, the heavy hammer is hit when the slag is cleared, and the destructive force.  The residual stress of the casting is cracked by cold and heat.

Casting process measures of slag pot:

1. Due to the poor fluidity of molten steel, in order to prevent cold insulation and insufficient pouring of steel castings, the wall thickness of steel castings should not be less than 8mm;  the structure of the gating system should be simple and the section size is larger than that of cast iron;  dry or hot casting moulds are adopted;  the pouring temperature is generally 1520 °~ 1600 ℃, because the pouring temperature is high, the superheat of molten steel is large, and the liquid state is kept for a long time, and the fluidity can be obtained.  However, if the pouring temperature is too high, it will cause defects such as coarse grains, hot cracking, pores and sticking sand.  Therefore, for general small, thin-walled and complex castings, the pouring temperature is about + 150 ℃ of steel, and the pouring temperature of large and thick-walled castings is about 100 ℃ higher than its melting point.

2. In order to prevent the defects of shrinkage and porosity of castings, riser, cold iron and subsidy are mostly adopted in the casting process to realize sequential solidification.  In addition, in order to prevent shrinkage, porosity, pores and cracks in steel castings, the wall thickness should be uniform, sharp-angle and right-angle structure should be avoided, sawdust should be added to the mold sand, coke should be added to the mold core, and hollow core and oil sand core should be used to improve the concession and air permeability of the sand mold or core.