China Export Sisr/Ferro Silicon Alloy Inoculant in Casting Iron is a deoxidizer, which reduces oxygen content in the molten metal, thus improving its quality. It also enhances the section uniformity of castings.
TENAX S.A., ARGENTINA - foundry materials, moulding binders – sodium silicate and potassium silicate, chromite stuffing sand, ilmenite for cores of shell moulds.
Ferro silicon is an essential alloy additive and deoxidizer used in iron smelting industry. It is produced by reduction of steel scrap, silica and coke in electric furnaces. Its high reactivity with oxygen prevents the loss of carbon from the molten steel, which ensures the quality of the finished products.
Moreover, increasing investment in infrastructure is boosting the demand for iron and steel, which is expected to further propel the market growth. Rising demand for EVs is also encouraging players to invest in expanding the production capacity of non-oriented electrical steel, which requires the use of ferrosilicon.
The magnesium containing nodulizers of the present invention are faster dissolving than the commercially available alloys and permit the treatment of molten iron at lower temperatures. This in turn reduces the amount of alloy granules which are swept into the casting which, in the past has led to such problems as shrinkage defects and surface irregularities.
Unlike the weak sulfide formers such as calcium and aluminum which have been used in previous nodulizing agents, these nodulizers contain strontium which forms a sulfide with lattice parameters very similar to those of graphite crystal. This is expected to provide the best nucleating effect.
This type of nodulizer has a very good effect on improving the quality of gray cast iron and ductile cast iron. It can also reduce the chilling tendency and improve machinability.
Ferro silicon also serves as a deoxidizer in the steel-making process. It reduces oxygen, sulfur, and nitrogen contents in the molten metal, thereby improving metallurgical quality of final products. In addition, it increases elasticity and scale resistance (heat resistant steels) and electrical conductivity and magnetostrictivity in electrical steels.
Elkem Foundry Products’ range of ferrosilicon inoculants includes Barinoc(r), Reseed(r) and SMZ(r). These are well-known as powerful chill removers for grey irons with sulphur levels above 0.05% and promote a good, uniform graphite structure. These inoculants can be used as ladle or stream inoculants. They are also effective as first stage inoculants for low nucleation ductile irons. These inoculants contain strontium and zirconium to provide high power for chill removal and graphite promotion at lower addition rates.
The low melting point of Zirconium Ferro Silicon makes it a good inoculant for gray and ductile iron. It can reduce chill in thin or heavier sections of the casting by promoting graphite nucleation. This can improve the tensile strength, elongation and impact strength of cast iron parts.
The major nucleation mechanism of modern inoculation for gray and ductile iron involves the formation of strong sulfide formers such as calcium, barium, cerium, or strontium. These sulfides have lattice parameters similar to graphite crystal structure, so they can act as the nucleation sites for graphite growth.
MG UNIVERZAL, SERBIA - non-ferrous foundry and recycling of industrial waste lead, production of zamak alloys in ingots – tin bronze, leaded bronze, gunmetal, aluminium bronze, copper, brass and cupro nickel, casting of decorative fence spikes for garden use, gravity-die casting of metal parts.
Inoculant for ductile cast iron with lamellar or compacted graphite, contains calcium and other elements which suppress the formation of iron carbide and promote the growth of graphite. This is achieved by the addition of strong sulfide formers such as calcium, barium, strontium, cerium and lanthanum. Since these sulfides have lattice parameters closely matching those of graphite, they serve as substrates to initiate the graphite nucleation process.
Among the commercial inoculants available today, strontium-containing sulfides have been shown to be the most effective. This is especially true when large undercooling is involved, as strontium exhibits the highest tendency to reduce eutectic cell size and thus shortens shrinkage defects.
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