Desulco®, since its introduction in 1977, has been recognized worldwide as the premier recarburiser for use in the production of ductile iron. Desulco is produced with Superior Graphite's patented high temperature furnace technology. This continuous process purifies the raw material, selected low sulfur petroleum coke, at temperatures in excess of 2760°C, resulting in the final product, Desulco. Due to its extremely high purity, its particle morphology, and its graphitic crystalline structure, Desulco is a unique type of carbon. The extremely low gas content of Desulco makes it the preferred material for use as a late addition in the grey iron industry as well as in steel plants producing high carbon steel grades.

Desulco Grades

Grades	Particle size	Application	Appearance
9001	0.20 - 9.50 mm -3/8 +65 mesh	ideal charge carbon for induction furnace melting
9005	1.40 - 9.50 mm -3/8 +12 mesh	steel and other ferrous applications
9007	0.60 - 9.50 mm -6 +12 mesh	high carbon steel applications to avoid gas and sulfur contamination
9010	0.20 - 4.75 mm -4 +65 mesh	Ideally sized for foundries, which wish to avoid particles > 4,75 mm
9012S	0.60 – 4.75 mm -6 +28 mesh	rapid carbon dissolution and high carbon recovery
9018	0.18 – 0.85 mm -20 +80 mesh	carbon injection, ladle trim, rotary furnace

Desulco Advantages
The morphology, chemistry and crystallinity of recarburisers have a major impact on the overall casting cost. The combined application and cost benefits, which are derived through the use of Desulco, enable foundries to manufacture castings in a highly cost effective manner.

Desulco reduces
• Recarburiser consumption
• Power consumption
• Inoculant consumption
• MgFeSi consumption
• Furnace refractory wear
• Scrap rate
• Tap to tap time
• Slag inclusions risk
• Chill

Desulco increases
• Casting microstructure
• Productivity
• Process consistency

Carbon Recovery
Compared with calcined petroleum coke, acetylene coke and graphite electrode scrap, Desulco yields the highest carbon recovery and fastest dissolution time.

Nucleating Effect
The unique crystallinity of Desulco showed the greatest nucleation improvement in grey iron melts, resulting in a maximum chill depth reduction.

Microstructure
Below is an example of microstructure obtained on automotive safety parts when comparing the use of Desulco and low sulfur petroleum coke.

Trials have shown that such pieces can be obtained in specification, using Desulco, even having eliminated the late inoculation.
(All results were obtained without late inoculant)

Ferritic Structure
In the absence of late inoculation, Desulco strongly increased the ferritic matrix of nodular cast iron. Average improvements of
10 – 15 % are common when compared with petroleum coke.

Nodule Shape
Using Desulco versus a coke-based recarburiser, it’s typical to obtain an improvement of 10 – 15 % looking on graphite V and VI.
(results obtained without late inoculation)

Graphite type V and VI

Nodule Count
Using Desulco versus a coke-based recarburiser, a substantial increase of the nodule count is observed.
(results obtained without late inoculation)