Elkem is the preferred supplier for leading companies in the steel and casting industry.
Advantages of the Elgraph® recarburisers are:
- High carbon recoveries
- Easily rapid solubility even at low agitation
- Consistent quality due to continuous production process
- Carbon trimming just prior to casting
- Very low nitrogen/hydrogen levels reduce pinhole risk
Research and development has resulted in a new generation electric calciners, operating continuously at very high temperatures (up to 3000 °C), creating a carbon raiser with high purity, excellent solubility and high carbon recovery that contribute to a more cost efficient production of castings.
Economy and cost effectiveness are key words in the foundry and steel industries, and the selection of recarburisers strongly influences this. Key requirements are
- high carbon yields – value for money
- less slag – improved operations, reduced power cost
- dissolution rate – energy costs and tap-to-tap times
- reproducibility – planning, automation and fewer rejects
- lining life – economy and down-time
The technology developed for Elgraph is capitalising from the production of 100 years Elkem electrode paste production for selecting, control and testing raw material to control and optimize the production based on customer needs.
The high calcining temperature allows Elkem to produce a purer and more graphitised product. It is generally found that the more graphitised the recarburiser, the better the carbon recovery and solubility.
As a measurement for the degree of graphitisation the electrical resistance can be used. Practical foundry experience has shown that solubility can be related to the degree of graphitisation, which is related to the resistivity of the recarburisers. Typically a good solubility recarburiser should have a resistivity of less than 270 µOhm.
The new calcining technology allows the production of recarburisers with very low levels of sulphur, nitrogen, hydrogen, volatile matters and ash. Its high dissolution rate makes it very suitable in the carbon adjustment phase of metal preparation.
Elgraph® recarburisers products are widely used in the manufacture of cast irons and in steel production in almost all continents.