Exothermic HOT TOPS (Any shape & Size)
INTRODUCTION :
Export Grade hot tops which are highly Insulating or Exothermic, light weight, pre-baked, in pre-fabricated shapes used as feeder heads & are fitted on or Inserted in the Ingot moulds.
It has good strength, close dimensional accuracy and is an easy disposable assembly. It will offer proper feeding of the Ingots during solidification of liquid steel. Primary and secondary piping is restricted within the Hot Top portion thereby producing sound ingots without shrinkage defects. Use of Hot Tops leads to increase in yield of the steel.
Hot Tops act as a reservoir of liquid metal for the cast iron mould in steel ingot castings. It keeps the metal in molten form and feed the metal to the ingot body till solidification of casting is completed, by providing an exothermic reaction along with insulating properties and it solidifies at last.
ALL TYPES AND SIZES AVAILABLE
It can be designed as Super Imposed, Over Imposed, Semi Inserted, Inserted, Deep Inserted as per Customer’s requirements in single piece, Four Flats, or Flats and Corner system and segmented for Polygonal big Ingot moulds.
These are also available in various sizes like self-supporting where use of extension ring could be avoided.
APPLICATION:
The working of Hot Top is to keep the metal in molten form till solidification of ingot body is completed, initially by providing enormous amount of heat due to exothermic reaction till complete burning of Hot Top, then it acts as an insulator to furnish above function.
ADVANTAGES:
- Increase casting yield.
- Increase directional solidification.
- Avoid the shrinkage cavity/ piping in ingot body.
- Increase the soundness of ingot.
RECOMMENDATIONS:
While using super Imposed Hot Tops (Single piece or 4 flats and 4 corners system), we recommend use of cast fabricated type extension ring/counter weight for holding the Hot Top tightly to avoid lifting or leakage.
DATA REQUIRED FROM CUSTOMER TO DESIGN THESE HOT TOPS:
Before we develop, Hot Top for particular Ingot mould, we need the following data from Customer.
- Mould drawing.
- Mould imprint (Where Hot Top is to be fitted)
- Weight of steel ingot including Hot Top metal weight.
- Type of steel to be cast.
- Whether ingot moulds are to be used at Narrow End Up or Wide End Up.
STORAGE PRECAUTION:
HOT TOPS should be stored in dry place and to be used within 4-5 months from the date of supply.