Directly Supply offers a number of nodulizers and inoculants for iron casting applications. These products help reduce chill and carbide formation in gray and ductile irons while improving graphite structures and machinability.
These master alloys work well as a ladle addition and are highly compatible with in-stream inoculant injectors. They can also be used in thin wall castings.
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Resulf 30 denodulizing tablets make it easy and accurate to add controlled amounts of sulfur and oxygen to molten gray or ductile irons. This results in reduced chill formation, improved graphite structures and improved machinability. When used in conjunction with most current inoculants, it has been found to significantly improve their performance.
The high-performance inoculant, which is also available as a tablet and pressed briquette (InocuBloc), has up to 30 times the nucleation power of traditional ferrosilicon ladle inoculants or in-stream inoculants. It can be added to gray irons and ductile irons as either a ladle addition or in-stream inoculant injection. Fractional amounts of Sphere-O-Dox G, typically 1/4 to 1/2 of the level in traditional inoculants, can achieve outstanding chill reduction and nodule count suppression as well as graphite nodule distribution improvement, resulting in dramatic mechanical property increases.
The encapsulation efficiency of Dox into MS1:DOXMS2 spheres was assessed using fluorescent imaging at excitation wavelengths of 350 and 480 nm, respectively. The results showed that the spheres retained Dox for at least 30 min after the postloading. The encapsulated Dox was released into the cell medium at pH 7.4 but at significantly lower release efficiency than at pH 4.5. The lower release efficiency at pH 7.4 may be due to the higher solubility of protonated Dox compared with unprotonated Dox.
ASI’s high-performance patented inoculants, Sphere-O-Dox G and Sphere-O-Dox HC, promote the formation of fine Type A flake graphite in gray iron and offer outstanding chill reduction, nodule count reduction and mechanical properties. These inoculants can be added as a powder, in-stream or as pressed in-mold inserts.
In-mold inoculation eliminates the need for moving a ladle from mold to mold on the pouring floor. Instead, a member of the pouring crew can add a precisely metered and sized inoculant tablet into the iron stream.
In-mold inoculation has a significant effect on the solidification of gray and ductile iron, far more than can be achieved with either magnesium ferrosilicon in-stream or cast/pressed in-mold inserts. In fact, a single 7 gram InocuBloc tablet has more nucleating power than foundry-grade FeSi75. (Riposan, et al. American Foundry Society Paper 07-023)
This inoculant is used mainly in machine casting and ductile iron applications. It strongly increases graphitization core, sharply increase eutectic cell count to promote strong pearlite structure and machinability, improves elongation and reduces the tendency of white cast. It also prevents spheroidizing recession and improves spheroidizing rate.
It is made by reducing sand (SiO2) or silica (SiO3) with coke or coal and iron (Fe) from scraps in blast furnaces or electric arc furnaces. The process removes oxygen and produces a clean Silicon and Iron product.
A zirconium silicon or titanium metal can be added to the molten ferrosilicon either before, during, or after it is introduced into the liquid iron bath. This addition significantly enhances the inoculant performance, and has been shown to produce chill depths superior to those obtained with commercial inoculants such as SUPERSEED. The result is increased inoculant potency and decreased inoculant cost per ton. This can be especially useful in higher strength, 3.6-3.8 Carbon equivalent irons.
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